Gebruiksaanwijzing /service van het product 856290216 van de fabrikant Agilent Technologies
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Errata Title & Document Type: 8562E Spectrum Analyzer Service Manual Manual Part Number: 08562-90216 Revision Date: 1997-12-01 HP References in this Manual This manual may contain references to HP or Hewlett - Packard.
Service Guide HP 8562E Spectrum Analyzer Fia HEWLETT PACKARD HP Part No. 08582-90218 Supersedes 08582-90209 Printed in USA December 1997.
Notice. The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Certification Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further certifies that its calibration meas.
Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packard products. For any assistance, contact your nearest Hewlett-Packard Sales and Service Ofice. Safety Notes The following safety notes are used throughout this manual.
General Safety Considerations Warning This is a Safety Class I product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact.
How to Use This Guide Chapter 7, “General Troubleshooting,” can be used to identify the location of a problem to a board or functional area in the spectrum analyzer. Chapters 8 through 13, which cover the functional areas, can then be used to help you localize the problem further.
Contents 1. General Information Serial Numbers and Repair Information ................. Instrument Variations ......................... HP 85629B Test and Adjustment Module ................ Service Kit .............................. Electrostatic Discharge .
3. 16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment ........... 2-60 17. 16 MHz PLL Adjustment ..................... 2-63 18. 600 MHz Reference Adjustment .................. 2-66 Frequency Response Adjustment Software Getting Started ....................
Cal Factor outside of 0 to 150% range entered ............ CONDITIONS file from system file location is not compatible! WARNING Conditions Menu DUT ID disagrees with responding DUT ID ..... Data not accepted, check entry format ................ DUT doesn’t respond at address listed .
A9 Input Attenuator ........................ 4-32 A10 YIG-Tuned Filter/Mixer (RYTHM) ................ 4-34 AllYTO ............................. 4-35 Al3 Second Converter ........................ 4-36 Procedure 9. Al4 and Al5 Assemblies ...............
RF Low Band Check ....................... Manual Probe Troubleshooting .................... RF Path Fault Isolation ....................... Calibration Oscillator Troubleshooting Mode .............. Error Messages ............................ Viewing Multiple Messages .
Offset Lock Loop (part of A15) ................... Fractional N PLL (part of A14) ................... IF Section ............................. A4 Log Amplifier/Cal Oscillator Assembly .............. A5 IF Assembly ......................... ADC/Interface Section .
B-Bit Flash ADC .......................... Peak/Pit Detection ......................... 32 K-Byte Static RAM ....................... Al6 Assembly Fast ADC Control Circuits (Option 007) .......... CPU Interface and Control Registers ................. Reference Clock .
Step Gains ............................. Cal Oscillator (P/O A4 Assembly) ................... Cal Oscillator Unlock at Beginning of IF Adjust ............ Inadequate CAL OSC AMPTD Range ................. 300 Hz to 3 kHz Resolution Bandwidth Out of Specification .
YTO Main Coil Span Problems (LO Spans >20 MHz) .......... YTO FM Coil Span Problems (LO Spans 2.01 MHz to 20 MHz) ..... Fractional N Span Problems (LO Spans 12 MHz) ............ First LO Span Problems (All Spans) ................. First LO Span Problems (Multiband Sweeps) .
Low Voltage Supplies ........................ 13-15 Buck Regulator Control Loop .................... 13-15 High Voltage Supplies ........................ 13-15 CRT Supply Dropping Out ...................... 13-16 Buck Regulator Control ...............
Figures l-l. Example of a Static-Safe Workstation ................. l-2. Spectrum Analyzer Shipping Container and Cushioning Materials ..... 2-l. High Voltage Power Supply Adjustment Setup ............. 2-2. Display Adjustment Setup ..................
4-13. 4-14. 4-15. 4-16. 4-17. 4-18. 4-19. 4-20. 4-21. 4-22. 4-23. 4-24. 4-25. 4-26 1. 4-27 4-28 5-l 5-2 5-3 5-4 5-5 5-6 6-l 6-2 6-3 6-4 6-5. 6-6. 6-7. 6-8. 6-9. 7-l. 7-2. 7-3. 7-4. 7-5. 7-6. 7-7. 8-l. 8-2. 8-3. 9-l. 9-2. 9-3. 9-4. 9-5. 9-6. 9-7. 9-8. 9-9.
9-11. Region B Amplitude Variation .................... 9-12. Region B Amplitude Offset ...................... 9-13. Faulty Crystal Short ........................ 9-14. Faulty LC Pole ........................... 9-15. Faulty Crystal Symmetry .........
A-l. HP 85623 Interconnect Block Diagram . . . . . . . . . . . . . . . . A-5 Contents-14.
Tables Contents-15 l-l. Instrument Variations ........................ l-2 l-2. Service Kit Contents ........................ l-4 l-3. Static-Safe Accessories ........................ l-6 l-4. Recommended Test Equipment .................... l-10 l-5. Hewlett-Packard Sales and Service Offices .
11-3. TAM Tests versus Test Connectors .................. 11-4. Center Frequency Tuning Values ................... 11-5. Sampling Oscillator Test Frequencies ................. 11-6. Sampling Oscillator PLL Divide Numbers ............... 11-7. Amplifier Polarities .
General Information This HP 8562E Spectrum Analyzer Service Guide contains information required to adjust and service the HP 85623 to the assembly level. Serial Numbers and Repair Information Hewlett-Packard makes frequent improvements to its products to enhance performance, usability, or reliability.
c!a HEWLETT PACKARD 3425A00564 I Earlier Serial Number Label Example The new serial number format (USOOOOOOOO) is always considered “above” the earlier format (OOOOAOOOOO) h y w en ou encounter change information such as “. . . . serial prefix 3425A and above” or “.
HP 85629B Test and Adjustment Module When attached to the rear panel of the spectrum amdyzer, the HP 85629B test and adjustment module (TAM) provides diagnostic functions for the HP 85623. The TAM is accessed by a computer running interface software; this software is supplied with Option 915, add Service Documentation.
Service Kit The spectrum analyzer service kit (HP part number 08562-60021) contains service tools required to repair the instrument. Refer to Table l-2 for a list of items in the service kit.
Building Ground ist Stra61 w--A- Cord ’ I- II L Figure l-l. Example of a Static-Safe Workstation Reducing Potential for ESD Damage The suggestions that follow may help reduce ESD damage that occurs during instrument testing and servicing.
Static-Safe Accessories Table 1-3. Static-Safe Accessories Description Set includes: 3M static control mat 0.6 m x 1.2 m (2 ft x 4 ft) and 4.6 cm (15 ft) ground wire. (The wrist-strap and wrist-strap cord are not included. They must be ordered separately.
Other Packaging Caution Spectrum analyzer damage can result from using packaging materials other than those specified. Never use styrene pellets in any shape as packaging materials. They do not adequately cushion the equipment or prevent it from shifting in the carton.
Item 1 r 2 3 Description I HP Part Number 9211-6969 Outer Carton 9220-5073 Pads (2) 9220-5072 Top Tray Figure 1-2. Spectrum Analyzer Shipping Container and Cushioning Materials 1-6 General Information.
Recommended Test Equipment Table l-4 lists the recommended test equipment required for operation verification, performance tests, adjustments, troubleshooting, and the Test and Adjustment Module. Any equipment that meets the critical specifications given in the table can be substituted for the recommended model(s).
Table l-4. Recommended Test Equipment Critical Specifications for Equipment Substitution Frequency range: 10 MHz to 13.2 GHz Frequency accuracy (CW): x l0-g/day Leveling modes: Internal & External Modulation modes: AM & Pulse Power level range: -80 to +16 dBm Frequency range: 200 Hz to 80 MHz Frequency accuracy: 1 x 10e7/month Flatness: f0.
Table 1-4. Recommended Test Equipment (continued) Instrument Counters Frequency standard Critical Specifications for Equipment Substitution Output frequency: 10 MHz Accuracy: <l x 10-l’ Recommend.
Table 1-4. Recommended Test Equipment (continued) Instrument Xher Equipment 2ontroller Critical Specifications for Equipment Substitution Required to run operation verification software.
Table 1-4. Recommended Test Equipment (continued) Instrument Accessories Directional bridge Directional coupler (two required) 10 dB step attenuator 1 dB step attenuator 20 dB fixed attenuator 10 dB f.
Table 1-4. Recommended Test Equipment (continued) Low-pass filter 1 I I I s 7 c 7 C C C C Cutoff frequency: 50 MHz Rejection at 65 MHz: >40 dB Rejection at 75 MHz: >60 dB 0955-0306 Jaw-pass filter (two required) Cutoff frequency: 1.8 GHz Rejection at >3 GHz: >45 dB 0.
Table 1-4. Recommended Test Equipment (continued) Instrument Cable, HP-IB (eight required) Adapters Adapter Adapter (three required) Adapter Adapter Adapter Adapter (two required) Adapter Adapter Adap.
Sales and Service Offices Hewlett-Packard has sales and service offices around the world providing complete support for Hewlett-Packard products. To obtain servicing information, or to order replacement parts, contact the nearest Hewlett-Packard Sales and Service Office listed in Table l-5.
Table 1-5. Hewlett-Packard Sales and Service Offices US FIELD OPERATIONS Headquarters California, Northern Hewlett-Packard Co. Hewlett-Packard Co. 19320 Pruneridge Avenue 301 E. Evelyn Cupertino, CA 95014 Mountain View, CA 94041 (800) 752-0900 (415) 694-2000 California, Southern Hewlett-Packard Co.
2 Adjustment Procedures Introduction This chapter contains information on automated and manual adjustment procedures. Perform the automated procedures using the HP 85629B test and adjustment module (TAM). Never perform adjustments as routine maintenance.
Safety Considerations Although this instrument has been designed in accordance with international safety standards, this manual contains information, cautions, and warnings which must be followed to ensure safe operation and to prevent damage to the instrument.
Adjustment Tools For adjustments requiring a nonmetallic tuning tool, use fiber tuning tool, HP part number 8710-0033. Two different tuning tools may be necessary for IF bandpass adjustments, depending upon the type of tuning slug used in the slug-tuned inductors.
Assembly Changed or Repaired AlAl keyboard AlA RPG A2 controller A3 interface A4 log amp/Cal osc A5 IF A6 power supply A6Al HV module A7 switched LO distribution amplifiei Table 2-1.
Table 2-1. Related Adjustments (continued) Assembly Changed or Repaired A8 low band mixer A9 input attenuator A10 RYTHM All YTO Al3 2nd converter Al4 frequency control Al5 RF A15UlOO sampler Al7 CRT d.
Table 2-2. Adjustable Components Reference Designator A2R152 A2R206 A2R209 A2R215 A2R218 A2R262 A2R263 A2R268 A2R271 A4C707 A4R445 A4R531 A4R544 A4R826 A5L300 A5L301 A5L700 A5L702 A5R343 A5T200 A5T202.
Table 2-2. Adjustable Components (continued) Reference Designator A5T500 Adjustment Adjustment Name Number XTAL CTR 3 3 A5T502 XTAL CTR 4 3 A6R410 HV ADJ 1 A14R42 6.
Reference Adjustment Designator Number A5C204 A5C216 A5C326 A5C327 A5C505 A5C516 A5C717 A5C718 3 3 3 3 3 Table 2-3. Factory Selected Components Basis of Selection Selected to optimize center frequency of LC tank that loads the crystal. Selected to optimize center frequency of LC tank that loads the crystal.
Using the TAM The HP 85629B TAM, in conjunction with the HP 8562E/TAM Interface Software (TAM I/F SW), can be used to perform approximately half of the spectrum analyzer adjustment procedures. Table 2-4 lists the TAM adjustments and their corresponding manual adjustments.
Table 2-4. TAM Adjustments TAM Adjustment 1. IF bandpass, LC poles 2. IF bandpass, crystal poles 3. IF amplitude 4. Limiter phase 5. Linear fidelity 6. Log fidelity 7. Sampling oscillator 8. YTO 9. LO distribution amplifier 10. Low band flatness* 11. High band flatness and YTF* 12.
Table 2-5. Required Test Equipment for TAM 10. Low band flatness 11. High band flatness Not applicable Not Applicable 12. Calibrator amplitude Power meter HP 8902A, HP 436A, HP 438A Power sensor (300 MHz) HP 8482A, HP 8481A 13. 10 MHz reference Frequency counter HP 5342A, HP 5343A Oscillator (9 to 11 MHz) 14.
Front End Cal (adjustment) This procedure automates two manual procedures: Frequency Response Adjustment, and YIG-Tuned Filter/Mixer (RYTHM) Adjustment.
1. High Voltage Power Supply Adjustment 1. High Voltage Power Supply Adjustment Assembly Adjusted A6 power supply Related Performance Test There is no related performance test for this adjustment. Description The high voltage power supply is adjusted to the voltage marked on the A6Al HV module.
1. High Voltage Power Supply Adjustment Equipment Digital multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A DVMtestleads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Display Adjustment 2. Display Adjustment Assembly Adjusted A2 controller Al7 CRT driver Related Performance Test Sweep Time Accuracy (Sweep Times <30 ms) Description Coarse adjustment of the deflection amplifiers, Z-axis amplifiers, and line generators is done using the CRT adjust pattern.
2. Display Adjustment Procedure Note Perform the 16 MHz PLL Adjustment in this chapter before proceeding with this adjustment. 1. Turn the spectrum analyzer off by pressing (LINE). Remove the spectrum analyzer cover and fold out the A2 controller and A3 interface assemblies as illustrated in Figure 2-2.
2. Display Adjustment 12. Adjust the rear-panel TRACE ALIGN until the leftmost line of the test pattern is parallel with the CRT bezel. See Figure 2-3. 13. Adjust the rear-panel X POSN and A17R55 X GAIN until the leftmost “@” characters and the softkey labels appear just inside the left and right edges of the CRT bezel.
2. Display Adjustment Intensity Adjustments 16. Press (AMPLITUDE) then set the REF LVL to -70 dB and the LOG d&‘DIV to 1. This should almost completely fill the screen with the noise floor. Press (SGL). Adjust A17R4 2 GAIN until the intensity at the center of the screen is about medium.
2. Display Adjustment A2R215 A2R263 AZR262 AZR268 DGTLY GAlN START BLANK STOP BLANK VIDEO GAIN AZR206 DGTLY GAIN Figure 2-4. A2 Display Adjustment Locations SK14 Fast Zero Span Adjustments 22. Set A2R209 SWEEP OFFSET, A2R218 VIDEO OFFSET, and A2R268 SWEEP GAIN to midrange.
2. Display Adjustment 25. Press (MKR), [m), MARKER 4 REF LYL. If the marker is not at the top graticule, press MARKER-, REF LVL again. 26. Press (SAVE), SAVE STATE ,and STATE 0. 27. Set the sweep time to 10 ms. 28. Press (SAVEI, SAVE STATE ,and STATE 1.
3. IF Bandpass Adjustment 3. IF Bandpass Adjustment Assembly Adjusted A5 IF assembly Related Performance Test Resolution bandwidth accuracy and selectivity Description The center frequency of each IF bandpass filter pole is adjusted by DAC-controlled varactor diodes and an inductor (for the LC poles) or a transformer (for the crystal poles).
3. IF Bandpass Adjustment Procedure 1. Turn the spectrum analyzer off by pressing @. Disconnect the power cord. Remove the spectrum analyzer cover and fold down the A2 controller, A3 interface, A4 log amp, and A5 IF assemblies. Reconnect the power cord.
3. IF Bandpass Adjustment 11. Move the positive DVM test lead to A5TPl (this is a resistor-lead type of test point). 12. Adjust A5L702 LC CTR 4 using the procedure in steps 4 through 6.
3. IF Bandpass Adjustment Note If the range for the XTAL CTR adjustment is insufficient, replace the appropriate factory-selected capacitor as listed in Table 2-8. To determine the correct replacement value, center the XTAL CTR adjustment, and press AD.
3. IF Bandpass Adjustment Table 2-10. Capacitor Part Numbers I Capacito;? (pF) 8.2 10 12 ~ 15 18 20 22 24 27 HP Part Number 0160-4793 0160-4792 0160-4791 0160-4790 0160-4789 0160-4788 0160-5699 0160-4.
4. IF Amplitude Adjustments The IF amplitude adjustments consist of the cal oscillator amplitude adjustment and the reference 15 dB attenuator adjustment.
4. IF Amplitude Adjustments Equipment Frequency synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A Adapters Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. IF Amplitude Adjustments 3. Set the spectrum analyzer controls as follows: Center frequency ............................................. 10.7 MHz Span ......................................................... 200kHz Reference level ...............
4. IF Amplitude Adjustments 18. Note the AMKR amplitude. Ideally, it should read 50.00 dB fO.l dB. 19. If the AMKR amplitude is less than 49.9 dB, rotate A5R343 15 dB ATTEN one-half turn counterclockwise for each 0.1 dB below 50.00 dB. If the AMKR amplitude is greater than 50.
5. DC Log Amplifier Adjustments There are three DC log adjustments; limiter phase, linear fidelity, and log fidelity. Assembly Adjusted A4 log amp/Cal oscillator Related Performance Tests IF Gain Unce.
5. DC Log Amplifier Adjustments Equipment Frequency synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A Adapters Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. 3. 4. 5. 6. A4 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. X Log Amplifier Adjustments Set the spectrum analyzer controls as follows: Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz Span . . .
5. DC Log Amplifier Adjustments 11. Repeat steps 5 through 10. A4 LOG Fidelity Adjustment 1. Press (LINE) to turn the spectrum analyzer off. Remove the spectrum analyzer cover and place the spectrum analyzer in the service position as illustrated in Figure 2-9.
6. Sampling Oscillator Adjustment Assembly Adjusted Al5 RF assembly Related Performance Test There is no related performance test for this adjustment procedure. Description The sampling oscillator tank circuit is adjusted for a tuning voltage of 5.05 Vdc when the sampling oscillator is set to 297.
6. Sampling Oscillator Adjustment 2. Press (PRESET) on the spectrum analyzer and set the controls as follows: Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2126MHz Spa n . . . . . . . . . . . .
6. Sampling Oscillator Adjustment Table 2-l 1. Sampling Adjustments 2158.3 293.478 2196.3 295 .ooo 2378.3 296.471 2422.3 297.222 2-36 Adjustment Procedures.
7. YTO Adjustment 7. YTO Adjustment Assembly Adjusted Al4 frequency control assembly Related Performance Tests Frequency Span Accuracy Frequency Readout Accuracy and Frequency Count Marker Accuracy Description The YTO main coil adjustments are made with the phase-lock loops disabled.
7. YTO Adjustment Procedure Note This adjustment cannot be performed if preselected external mixer mode is selected. The SAVELOCK ON OFF function must be OFF. YTO Main Coil Adjustments 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Press (LINE) to turn the spectrum analyzer off.
Al4 R93 J23 7. YTO Adjustment R42 R76 SP116E Figure 2-14. YTO Adjustment Locations 11. Place the jumper on A14J23 in the NORM position (pins 1 and 2 jumpered). 12. Disconnect the SMA cable from the first LO OUTPUT jack and reconnect the 500 termination on the first LO OUTPUT.
8. LO Distribution Amplifier Adjustment Assembly Adjusted Al4 frequency control assembly Related Performance Test First LO OUTPUT Amplitude Description The gate bias and SENSE voltages for the A7 switched LO distribution amplifier is adjusted to the value specified on the label of A7.
8. LO Distribution Amplifier Adjustment Procedure 1. Set the HP 85623 (LINE) switch to off and disconnect the line cord. Remove the cover and fold down the Al5 RF and Al4 Frequency Control assemblies. 2. Move the jumper on A2J12 from the WR PROT to the WR ENA position.
8. LO Distribution Amplifier Adjustment 15. On the HP 85623, press LCAL), MORE I OF 2, SERVICE CAL DATA, LO LEVELS, and INT LO LEVEL. The message DRIVE FOR BAND# 1 will be displayed. 16. Note the “Bl INT Sense” voltage printed on the A7 LO distribution amp label.
9. Frequency Response Adjustment 9. Frequency Response Adjustment Assembly Adjusted Al5 RF assembly Related Performance Tests Displayed Average Noise Level Frequency Response Description A signal of the same known amplitude is applied to the spectrum analyzer at several different frequencies.
9. Frequency Response Adjustment BNC CABLE f SYNTHES I ZEO FREQIJE ~ SWEEPER ISTANDI :NCY RD EXT RF OUTPUT ADAPTER !I RECE I VEi i A I REF POWER SPLITTER ADAPTER Figure 2-17. Frequency Response Adjustment Setup Equipment Synthesized sweeper ..........
9. Frequency Response Adjustment Procedure Note The YIG-tuned filter/mixer slope and offset adjustment must be correct before the high band part of the frequency response adjustment can be done. 1. Connect the equipment as shown in Figure 2-17. Do not connect the HP 8482A power sensor to the HP 11667B power splitter.
9. Frequency‘Response Adjustment 14. Add 67 to the 10 MHz RF gain DAC value and record as the 2 MHz RF gain DAC value. 2 MHz RF gain DAC value 15. Add 62 to the 10 MHz RF gain DAC value and record as the 6 MHz RF gain DAC value. 6 MHz RF gain DAC value 16.
10. Calibrator Amplitude Adjustment 10. Calibrator Amplitude Adjustment Assembly Adjusted Al5 RF assembly Related Performance Test Calibrator Amplitude and Frequency Accuracy Description The CAL OUTPUT amplitude is adjusted for -10.00 dBm measured directly at the front panel CAL OUTPUT connector.
11. 10 MHz Reference Adjustment-OCXO (Non-Option 103) Assembly Adjusted A21 OCXO assembly Note Replacement oscillators are factory adjusted after a complete warmup and after the specified aging rate has been achieved. Thus, readjustment should typically not be necessary after oscillator replacement and is generally not recommended.
11. 10 MHz Reference Adjustment-OCXO (Non-Option 103) SPECTRUM ANALYZER 0000 00 00 FREQUENCY 0000 STANDARD BNC CABLE BNC CABLE BOTTOM-SIDE VIEW FREQ OF MAIN DECK ADJ c -yJo 0 0 0 0 “0 cl Figure 2-19. 10 MHz Reference Adjustment Setup and Adjustment Location SK120 Equipment Frequency counter .
11. 10 MHz Reference Adjustment-OCXO (Non-Option 103) b. Allow the spectrum analyzer to remain powered on continuously for at least 24 hours to ensure that the A21 OCXO temperature and frequency stabilize. Note If the reference is set to 10 MHz EXT , press 10 MHz INT .
12. 10 MHz Reference Adjustment-TCXO (Option 103) 12. 10 MHz Reference Adjustment-TCXO (Option 103) Assembly Adjusted Al5 RF assembly Related Performance Test 10 MHz Reference Output Accuracy (Option 103) Description The frequency counter is connected to the analyzer CAL OUTPUT.
12. 10 MHz Reference Adjustment-TCXO (Option 103) Procedure Note Allow the spectrum analyzer to warm up for at least 30 minutes before performing this adjustment. 1. Connect the equipment as shown in Figure 2-20. Prop up the Al4 frequency control assembly.
13. Demodulator Adjustment 13. Demodulator Adjustment Assembly Adjusted A4 log amplifier/Cal oscillator assembly Related Performance Test There is no related performance test for this adjustment. Description A 5 kHz peak-deviation FM signal is applied to the INPUT 500.
13. Demodulator Adjustment Cables BNC,122cm (48in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A Oscilloscope probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . .
13. Demodulator Adjustment 8. A 1 kHz sine wave should be observed on the oscilloscope. Rotate the volume knob on the front panel of the spectrum analyzer until the amplitude of the 1 kHz signal is at about 150 mV (3 divisions on the oscilloscope). 9.
14. External Mixer Bias Adjustment (Non-Option 327) Assembly Adjusted Al5 RF assembly Related Performance Test There is no related performance test for this adjustment. Description A voltmeter is connected to the spectrum analyzer IF INPUT with the external mixer bias set to off.
15. External Mixer Amplitude Adjustment (Non-Option 327) 15. External Mixer Amplitude Adjustment (Non-Option 327) Assembly Adjusted Al5 RF assembly Related Performance Test IF Input Amplitude Accuracy Description The slope of the flatness compensation amplifiers is determined.
15. External Mixer Amplitude Adjustment (Non-Option 327) Equipment Synthesized sweeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8340A/B Measuring receiver . . . . . . . . . . . . . . . . . . . . . . . . .
8. 9. 10. 11. 12. 13. 14. 15. 15. External Mixer Amplitude Adjustment (Non-Option 327) Table 2-12. Conversion Loss Data Frequency (GHz) 18 20 22 Conversion Loss (dB) (230 dB) 24 26 27 Connect the HP 8481D to the HP 11708A attenuator already connected to the HP 8902A RF power connector.
15. External Mixer Amplitude Adjustment (Non-Option 327) 16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment Assembly Adjusted Al4 frequency control assembly Related Performance Tests Image, Multiple, and O.
16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment Procedure 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Set the HP 85623 luNE) switch to off and disconnect the line cord. Remove the spectrum analyzer cover, fold down the Al4 and Al5 board assemblies, and connect the line cord.
16. YIG-Tuned Filter/Mixer (RYTHM) Adjustment 14. Press PREV MENU, STORE DATA , and YES. 15. Place the WR PROT/WR ENA jumper on the A2 controller assembly in the WR PROT position. 16. On the HP 85623, press [E), MORE I OF 2, FACTORY PRSEL PK , m), then SAVE PRESEL PK.
17. 16 MHz PLL Adjustment 17. 16 MHz PLL Adjustment Assembly Adjusted A2 controller assembly Related Performance Tests Sweep Time Accuracy Gate Delay Accuracy and Gate Length Accuracy Delayed Sweep Accuracy Fast Sweep Time Accuracy (Option 007) Description The 16 MHz CPU clock is phase locked to the 10 MHz reference.
17. 16 MHz PLL Adjustment Procedure 1. Press m to turn the spectrum analyzer off. Remove the spectrum analyzer cover and fold out the A2 controller and A3 interface assemblies. Use a pc board prop to hold up the A3 interface assembly, as shown in Figure 2-26.
17. 16 MHz PLL Adjustment 8. Adjust A2R152 (16 MHz PLL ADJ) until the microwave frequency counter reads 14.4 MHz 6200 KHz. 9. Reconnect W22 to A2J8. The microwave frequency counter should read 16 MHz. If the counter reads 16 MHz and the display is still distorted, perform the display adjustments in “Display Adjustment,” in this’chapter.
18. 600 MHz Reference Adjustment Assembly Adjusted Al5 RF assembly Related Performance Test There is no related performance test for this adjustment. Description The 100 MHz VCXO and the tripler are adjusted for a maximum signal level at 600 MHz.
3 Frequency Response Adjustment Software This chapter describes how to load and run the frequency response adjustment software, included with every HP 85623 Option 915 (add Service Documentation). This software actually automates two manual adjustments: Frequency Response Adjustment, and YIG-Tuned Filter/Mixer (RYTHM) Adjustment.
Getting Started First, make sure you have a compatible controller (computer), and the proper test equipment. The following paragraphs describe requirements for controllers and test equipment. Once the proper equipment is identified, proceed to “Equipment Connections.
Test Equipment Table 3-l summarizes the equipment required to run the Frequency Response Adjustment procedure. The adjustment can use various model numbers of a particular equipment type.
Equipment Connections Computer (Controller) Setup For HP 9000 model 216 or model 236 computers, setup instructions are provided in Chapter 1, “Computer Installation,” of the BASIC Operating Manual. For HP 9000 model 310 computers, setup information is provided in Configuration Reference Munuul for Series 300 computers.
Using Frequency Response Adjustment Software Loading the Program Load HP BASIC into the computer. HP BASIC choices are: n BASIC 2.0 and extensions 2.1 w BASIC 3.0 or 4.0, which must include the following binaries: MAT IO GRAPH GRAPHX PDEV HPIB MS CLOCK CS80 DISC KBD For configuration instructions, refer to the BASIC Operating Manual.
Conditions Menu The first menu screen displayed is the Conditions Menu. The pointer displayed along the left edge of the screen may be moved with the knob (if one is present) or the up (fi) and down (4) arrow keys. Notice that the menu has two pages. Moving the pointer below the last entry on the page brings up the next page.
To select a particular sensor of a certain model number, move the pointer to the desired model number and press Change Entry. Enter the last five digits of the power sensor serial number (that is, the serial number suffix). The program checks to see that a data file containing the cal factor data for that particular sensor exists.
Note CONDITIONS files used with the operation verification software for either the HP 8560 A/B-S eries spectrum analyzers, or the HP 8560 E-Series spectrum analyzers are not compatible with the frequency response adjustment software.
To run this program in a dual-bus configuration, enter equipment addresses as described in “Setting HP-IB Addresses” above, making sure that each address properly identifies the bus select code to which it is connected. Program operation is the same for dual-bus and single-bus configuration.
Viewing and Editing a Power Sensor Data File Press View/Edit to view or edit a power sensor data file. Only data files listed on the screen can be viewed or edited. If a file is created but data is not stored, the filename is listed, but no data is viewed and it cannot be edited.
Single Test Press Single Test to run the adjustment indicated by the pointer. Once the adjustment is running, press Restart to abort and restart the test. Calibrate Power Sensor The frequency response adjustment program keeps track of which power sensor is being used and the elapsed time since it was last calibrated.
Frequency Response Adjustment Menu Softkeys This section provides a brief description of each menu of softkeys. More detailed information is provided in “Program Operation” in this chapter.
Adjust Menu Single Test Cal Sensor List Equip Cond Menu runs the adjustment indicated by the pointer, once. allows you to recalibrate the current power sensor and resets the internal “time-since-last-calibration” timer. lists the required equipment for the test indicated by the pointer.
Front End Cal (YIG-Tuned Filter/Mixer (RYTHM) and Frequency Response Adjustment) Assemblies Adjusted Al4 Frequency Control Assembly Al5 RF Assembly A10 RYTHM Related Performance Tests Displayed Averag.
Front End Cal (YIG-Tuned Filter/Mixer (RYTHM) and Frequency Response Adjustment) BNC CABLE f I 50 n 7 ADAPTER ( APC 3.5 CABLE 0 E’:;,,, Figure 3-1. Front End Cal Adjustment Setup REF sl132e Frequen.
Frequency Response Adjustment Error Messages The frequency response adjustment software displays prompts and error messages on the computer display. Error messages are preceded with ERROR:. For more information on prompts, refer to “Program Operation” in this chapter.
File <filename> not found The filename of the power sensor data file entered could not be found on the currently specified system mass storage file location.
Unable to load CONDITIONS file from listed system file location Program attempted to load the CONDITIONS file from the listed system mass storage file location. Check the msus of the System mass storage file location and the presence of the CONDITIONS file.
Error Messages Beginning with Variables <filename> file not found The file indicated could not be found at the listed system mass storage file location. Check the filename and the system mass storage file location. <keyboard entry> is a non-numeric entry The program expected a numeric entry but did not receive one.
4 Assembly Replacement This chapter describes the removal and replacement of all major assemblies. The following replacement procedures are provided: Access to Internal Assemblies Cable Color Code Procedure 1. Spectrum Analyzer Cover Procedure 2. Al Front Frame/Al8 CRT Procedure 3.
Access to Internal Assemblies Servicing the HP 85623 requires the removal of the spectrum analyzer cover assembly and folding down six board assemblies. Four of these assemblies lay flat along the top of the spectrum analyzer and two lay flat along the bottom of the spectrum analyzer.
Cable Color Code Coaxial cables and wires will be identified in the procedures by reference designation or name followed by a color code. The code is identical to the resistor color code. The first number indicates the base color with second and third numbers indicating any colored stripes.
Procedure I. Spectrum Analyzer Cover Removal/Replacement 1. Disconnect the line-power cord, remove any adapters from the front panel connectors, and place the spectrum analyzer on its front panel. 2. If an HP 85620A Mass Memory Module or HP 85629B Test and Adjustment Module is mounted on the rear panel, remove it.
Procedure 2. Al Front Frame/Al8 CRT Procedure 2. Al Front Frame/Al8 CRT Removal Warning The voltage potential at A8AlW3 is +9 kV. Disconnect at the CRT with caution1 Failure to properly discharge A8AlW3 may result in severe electrical shock to personnel and damage to the instrument.
Procedure 2. Al Front Frame/Al8 CRT 15. Place the spectrum analyzer on its right side frame with the front frame assembly hanging over the front edge of the workbench. 16. Fold out the Al4 and Al5 assemblies as described in steps 3 and 4 under “Procedure 9.
Procedure 2. Al Front Frame/Al8 CRT Warning The voltage potential at A8AlW3 is +9 kV. Failure to discharge A8AlW3 correctly may result in severe electrical shock to personnel and damage to the instrument. CONDUCTIVE SHAFT A6AlW3 CL I P LEAD INSULATED HANDLE Figure 4-2.
Procedure 2. Al Front Frame/Al8 CRT (4 PLACES) 1 0 v 0 -0 2 ENEATH CABLES) SI 12e Figure 4-3. A9, A18, and Line-Switch Assembly Mounting Screws 17. Remove screw (2) securing the A9 input attenuator assembly to the center support on the front frame. See Figure 4-3.
Procedure 2. Al Front Frame/Al8 CRT connectors and cover the tip with heatshrink tubing or tape to avoid scratching the enameled front panel. 23. Loosen screw (3) securing the line-switch assembly to the front frame. This is a captive screw and cannot be removed from the line-switch assembly.
Procedure 2. Al Front Frame/Al8 CRT A18Wl A18Wl 1 n sm627e Figure 4-5. Installing the CRT and front frame Assemblies Replacement Note Use care when handling the glass CRT EM1 shield. The glass may be cleaned using thin-film cleaner (HP part number 8500-2163) and a lint-free cloth.
Procedure 2. Al Front Frame/Al8 CRT AIAIWI SK127 Figure 4-8. Placing the CRT into the Front Frame 5. Connect A18Wl to A17J5. 6. Snap CRT cable W9 onto the end of the CRT assembly. 7. Fully seat the front frame and CRT assemblies into the spectrum analyzer.
Procedure 2. Al Front Frame/Al8 CRT 15. Use a 5/16-inch wrench to connect W41 from the A9 input attenuator to the front panel INPUT 50R connector. Make sure that W40, W36, and AlWl are routed between W41 and the attenuator bracket. Secure the A9 input attenuator bracket to the center support on the front frame using one panhead screw.
Procedure 3. AlAl Keyboard/Front Panel Keys Procedure 3. Al Al Keyboard/Front Panel Keys Removal 1. Remove the front frame from the spectrum analyzer as described in “Procedure 2. Al Front Frame/Al8 CRT.” 2. Place the front frame face-down on the bench and remove the front frame center support.
Procedure 4. AlA RPG Removal 1. Remove the A9 input attenuator as described in “Procedure 8. A7 through Al3 Assemblies.” 2. Disconnect the RPG cable from the AlAl keyboard assembly. 3. Remove the front panel RPG knob using a number 6 hex (Allen) wrench.
Procedure 5. A2, A3, A4, and A5 Assemblies Procedure 5. A2, A3, A4, and A5 Assemblies Removal 1. Remove the spectrum analyzer cover. 2. Place the spectrum analyzer on its right side frame. 3. Remove the eight screws holding the A2, A3, A4, and A5 assemblies to the top of the spectrum analyzer.
Procedure 5. A2, A3, A4, and A5 Assemblies SK129 Figure 4-7. A2, A3, A4, and A5 Assembly Removal Replacement 1. Place the spectrum analyzer on its right side on the work bench. 2. Attach the assembly being installed to the two chassis hinges with two panhead screws.
Procedure 5. A2, A3, A4, and A5 Assemblies (4 PLACES) cl Q 4 3 P T / / c / / . W42 / /w4’ 3 (BENEATH CABLES ) sl12e Figure 4-8. Assembly Cables (1 of 2) Assembly Replacement 4- 17.
Procedure 5. A2, A3, A4, and A5 Assemblies W52 w29 WH I TE VIOLET W27 ORANGE Figure 3-8. Assembly Cables (2 of 2) sll8e 4-18 Assembly Replacement.
Procedure 5. A2, A3, A4, and AS Assemblies W22 W23 W25 w29 W52 W27 w54 w55 W6 COAX 0 COAX 92 COAX 4 COAX 7 COAX 9 COAX 3 COAX 2 CABLE CLIP SI 19e Figure 4-9. Coaxial Cable Clip 7. Check to ensure that no cables will become pinched under the hinges when folding up the A4 and A5 assemblies.
Procedure 5. A2, A3, A4, and A5 Assemblies 12. Secure the assemblies using the eight screws removed in “Removal,” step 3. See Figure 4-7. AlAlWl A3 J602 A19Wl w4 SK133 Figure 4-10.
Procedure 6. A6 Power Supply Assembly Procedure 6. A6 Power Supply Assembly Removal Warning The A6 power supply and A6Al high voltage assemblies contain lethal voltages with lethal currents in all areas. Use extreme care when servicing these assemblies.
Procedure 6. A6 Power Supply Assembly 15. Disconnect all cables from the A6 power supply assembly. See Figure 4-11. 16. Use a TORX screwdriver to remove the hardware from the shield wall, the heatsink, and the A6 power supply assembly. 17. Remove the A6 power supply assembly by lifting from the regulator heatsink toward front of spectrum analyzer.
1 - k f/i !I Procedure 6. A6 Power Supply Assembly AGAIWI A6A 1 0 0 0 0 r w3 FAN POWER CABLE TIE TORX SCREW LINE POWER WI TORX SCREWS Figure 4-l 1. A6 Power Supply Connections Assembly Replacement 4-2.
Procedure 6. A6 Power Supply Assembly 6. Ensure that all cables are safely routed and will not be damaged when securing the A6 cover. 7. Secure the power supply cover shield to the power supply using three flathead screws (1). See Figure 4-12. One end of the cover fits into a slot provided in the rear frame assembly.
Procedure 7. A6Al High Voltage Assembly Procedure 7. A6Al High Voltage Assembly Removal Warning The A6 power supply and A6Al high voltage assemblies contain lethal voltages with lethal currents in all areas. Use extreme care when servicing these assemblies.
Procedure 7. A6Al High Voltage Assembly 15. Remove the three screws securing the A6Al high voltage assembly to the A6 power supply assembly. 16. Disconnect ribbon cable A6AlWl from A6J5. See Figure 4-11. 17. For Option 007 spectrum analyzers: Remove the two screws (1) securing two board-mounting posts to the left side frame and remove the posts.
Procedure 7. A6Al High Voltage Assembly 7. Place the Al7 CRT Driver assembly into the center-deck mounting slot nearest the CRT. Use caution when routing cables to avoid damage. 8. For Option 007 spectrum analyzers: Place the Al6 FADC assembly into the center-deck mounting slot nearest the left side frame.
Procedure 8. A7 through Al3 Assemblies A separate replacement procedure is supplied for each assembly listed below. Before beginning a procedure, do the following: n Fold out the Al4 and Al5 assemblies as described in “Procedure 9. Al4 and Al5 Assemblies.
Procedure 6. A7 through Al3 Assemblies FL1 Al3 FL2 W48 W33 w57 A8 / n w35 w13 WI0 WI2 All W I6 WI 1 Figure 4-14. HP 6562E Assembly Locations W46 / w39 / / w42 -AlO 1 w43 ’ A9 sllle Assembly Replacem.
A7 First LO Distribution Amplifier Removal 1. Remove the two screws securing the assembly to the spectrum analyzer center deck. 2. Use a 5/16-inch wrench to disconnect W38 and W39 at A7Jl and A7J2. 3. Disconnect W46 at A7J3. 4. Disconnect W42 at the front panel First LO OUTPUT connector.
A8 Low Band Mixer A8 Low Band Mixer Removal 1. Place the spectrum analyzer upside-down on the work bench with Al4 and Al5 folded out to the left. 2. Use a 5/16-inch wrench to remove W45 from FL1 and A8Jl. 3. Loosen W56 and W39 at A8J2, and A8J3. 4. Remove the two screws securing A8 to the center deck.
A9 Input Attenuator Removal 1. Place the spectrum analyzer upside-down on the work bench. 2. Remove W41 and W43. 3. Disconnect W34 from A7 and move this cable out of the way. 4. Remove screw (1) securing the attenuator to the front frame center support.
A9 Input Attenuator 9 c 9 d 1 ! slll3e Figure 4-15. A9 Mounting Screw at Right Side Frame Assembly Replacement 4-33.
A10 YIG-Tuned Filter/Mixer (RYTHM) Removal Caution Do NOT remove the brackets from the A10 assembly. If these brackets are removed and reinstalled, the performance of A10 will be altered. A new or rebuilt A10 assembly includes new mounting brackets already attached to it.
All YTO All YTO Removal 1. Disconnect W16 ribbon cable from the A10 assembly and move it out of the way. 2. Remove W56/FL2/W57 ( as a unit) and disconnect W38 at the All assembly. 3. Remove four screws (1) securing All to the right side frame. See Figure 4-17.
Al3 Second Converter Caution Turn off the spectrum analyzer power when replacing the Al3 second converter assembly. Failure to turn off the power may result in damage to the assembly. Removal 1. Place the spectrum analyzer upside-down on the work bench.
Procedure 9. Al4 and A15 Assemblies Procedure 9. Al4 and Al5 Assemblies Removal 1. Remove the spectrum analyzer cover as described in “Procedure 1. Spectrum Analyzer Cover.” 2. Place the spectrum analyzer on its right side frame. 3. Remove the eight screws (1) holding the Al4 and Al5 assemblies to the bottom of the spectrum analyzer.
Procedure 9. Al4 and Al5 Assemblies Caution DO NOT fold the board assemblies out of the spectrum analyzer one at a time. Always fold the Al4 and Al5 assemblies as a unit. Folding out one assembly at a time binds the hinges attaching the assemblies and may damage an assembly and hinge.
Procedure 9. Al4 and Al5 Assemblies WI w2 W58 (OPTION 005) i W18- w32---- A14’ w37’ WI w2 : w4g w50 w22 w31 w37 - w51- NOT USED- w33- AIAI 0 0 0 0 0 * - . k Al 8 D COMPONENT SlDE q J . . W I3 WI0 w34 W16 WI2 WI 1 Al5 W32 w19 (OPTION 001) w35 W36 Al5 W32 SI 14e Figure 4-19.
Procedure 10. Al6 Fast ADC and Al7 CRT Driver Removal 1. Remove the spectrum analyzer cover assembly and fold out the A2, A3, A4, and A5 assemblies as described in steps 3 through 6 under “Procedure 5.
Replacement Procedure 10. Al6 Fast ADC and Al7 CRT Driver 1. Connect W7, W8, W9, A6AlW2, and AlSWl to the Al7 CRT driver assembly. Place the assembly into the center-deck mounting slot next to the CRT assembly.
Procedure 11. Bl Fan Removal/Replacement Warning Always disconnect the power cord from the instrument before beginning this replacement procedure. Failure to follow this precaution can present a shock hazard which may result in personal injury. 1. Remove the four screws securing the fan assembly to the rear frame.
Procedure 12. ET1 Battery Procedure 12. BTI Battery Warning Battery BTl contains lithium polycarbon monofluoride. Do not incinerate or puncture this battery.
Procedure 13. Rear Frame/Rear Dress Panel Removal Warning The A6 power supply and A6Al high voltage assemblies contain lethal voltages with lethal currents in all areas. Use extreme care when servicing these assemblies. Always disconnect the power cord from the instrument before beginning this replacement procedure.
Procedure 13. Rear Frame/Rear Dress Panel 15. Remove the two flathead screws securing the rear panel battery assembly, and remove the assembly. Remove the battery and unsolder the two wires attached to the battery assembly. 16. Use a 9/16-inch nut driver to remove the dress nuts holding the BNC connectors to the rear frame.
Procedure 13. Rear Frame/Rear Dress Panel 4. Place the coax cable BNC connectors into the appropriate rear frame holes as described below. Use a 9/16-inch nut driver to attach the dress nuts holding the BNC connectors to the rear frame. Rear Panel Jack RF Cable W24, coax 5 W23, coax 93 1 W25, coax 4 W18, coax 97 W31, coax 8 W58, coax 0 5.
Procedure 13. Rear Frame/Rear Dress Panel Figure 4-23. A6 Power Supply Cover SP14E Assembly Replacement 4-47.
Procedure 14. W3 Line Switch Cable Removal Warning Due to possible contact with high voltages, disconnect the spectrum analyzer line-power cord before performing this procedure. 1. Remove the spectrum analyzer cover assembly as described in “Procedure 1.
Procedure 14. W3 Line Switch Cable 17. 18. Fold out the Al4 and Al5 assemblies as described in “Procedure 9. Al4 and Al5 Assemblies Removal,” steps 3 and 4. Loosen the screw (1) securing W3, the line switch assembly, to the front frame. The screw is captive.
Procedure 14. W3 Line Switch Cable 20. With wire cutters, clip the tie wrap holding the cable to the contact housing, From the top side of the spectrum analyzer, use contact removal tool, HP Part Number 8710-1791, to remove the four wires from the W3 connector.
Procedure 14. W3 Line Switch Cable STANDOFF SI 13e Figure 4-25. Line-Switch Mounting Screw and Cable Dress Assembly Replacement 4-5 1.
Procedure 14. W3 Line Switch Cable CONNECTOR POSITION OF TIE WRAP KNUCKLE WIRE (98) WIRE (928) WIRE (8) WIRE (918) PLUNGER PUSHES CONTACT OUT CONNECTOR BODY CONTACT REMOVAL TOOL ‘-- WIRE SK151 Figure 4-26. W3 Cable Connector Replacement (Using Contact Removal Tool, HP part number 87104791) 1.
Procedure 14. W3 Line Switch Cable 3. From the bottom side of the spectrum analyzer, insert the contact end of W3 through the slotted opening in the main deck. W3 should come through to the top side of the spectrum analyzer between the Al8 CRT assembly and the post-accelerator cable.
Procedure 14. W3 Line Switch Cable Cl 1 (6 PLACES) (6 PLACES) - (6 PLACES) sml13e Figure 4-27. Side Frame Mounting Screws 7. On the top side of the spectrum analyzer, redress W3. 8. Connect W3 to A6J2. Dress W3 into the slotted opening in the deck. 9.
Procedure 15. EEROM (A2U500) Procedure 15. EEROM (A2U500) Removal/Replacement Caution The EEROM is replaced with the power on. Use a nonmetallic tool to remove the defective EEROM and install the new EEROM.
Procedure 16. A21 OCXO Removal 1. Remove the rear frame assembly as described in “Procedure 13. Rear Frame/Rear Dress Panel Removal,” steps 1 through 20. 2. Place the spectrum analyzer on its right side frame. 3. Fold out the Al4 and Al5 assemblies as described in “Procedure 9.
Procedure 16. A21 OCXO Replacement 1. Connect W49, coax 82, to the OCXO and position the OCXO in the spectrum analyzer. Dress W50, orange cable, next to W49 through the opening in the deck. 2. Secure the OCXO to the spectrum analyzer main deck using three screws (1).
5 Repl.aceable Parts This chapter contains information on ordering all replaceable parts and assemblies. Locate the instrument parts in the following figures and tables: Table 5-l. Reference Designations, Abbreviations and Multipliers Table 5-2. Manufacturers Code List Table 5-3.
Direct Phone-Order System Within the USA, a phone order system is available for regular and hotline replacement parts service. A toll-free phone number is available, and Mastercard and Visa are accepted. Regular Orders: The toll-free phone number, (800) 227-8164, is available 6 am to 5 pm, Pacific standard time, Monday through Friday.
Table 5-1. Reference Designations, Abbreviations and Multipliers REFERENCE DESIGNATIONS A Assembly F Fuse RT Thermistor AT Attenuator, Isolator, FL Filter S Switch Limiter, Termination HY Circulator T.
Table 5-1. Reference Designations, Abbreviations, and Multipliers (2 of 4) r DAP-GL Diallyl Phthalate Glass DBL Double DCDR Decoder DEG Degree D-HOLE D-Shaped Hole DIA Diameter DIP Dual In-Line Packag.
Table 5-l. Reference Designations, Abbreviations, and Multipliers (3 of 4) ABBREVIATIONS N PLSTC Plastic SMA Subminiature, PNL Panel A Type (Threader N Nano, None PNP Positive Negative Connector) N-CH.
Table 5-1. Reference Designations, Abbreviations, and Multipliers (4 of 4) I U UCD Microcandela UF Microfarad UH Microhenry UL Microliter, Underwriters’ Laboratories, Inc. UNHDND Unhardened V W Watt, Wattage, White, Wide, Width W/SW With Switch ww Wire Wound X X By (Used with Dimensions), Rmrt.
Table 5-3. Replaceable Parts Reference Designation I lIPPart 1250-0780 HP 10502A 8710-1755 5062-0800 5 1 5001-8739 7 5001-8740 0 5001-8742 2 5021-5807 6 5021-5808 7 5021-5836 1 0510-1148 2 0515-0886 3.
Table 5-3. Replaceable Parts (continued) Reference Designation Al HP Part c Number D 0515-088s s 0515-1241 6 0515-1331 5 5061-9501 9 5061-9685 0 0515-1106 2 8710-1755 9 5958-6573 0 1494-0060 0515-0949 0515-1013 D515-0909 D535-0080 G - Description SCREW-MACH M3.
Table 5-3. Replaceable Parts (continued) Reference HP Part C Qty Description Mfr Mfi Part Designation Number D Code Number AlAl 08562-60140 6 1 BD AY-KEYBOARD 28480 08562-6014C AlAlWl 5062-8259 1 CABL.
Table 5-3. Replaceable Parts (continued) c D 4 Description FAST ADC ASSEMBLY 2848C 08563-60030 4 5041-3987 1 2090-0225 4 A19 08562-60042 7 A19Wl 5061-9031 0 5062-7755 3 5063-0245 4 CRT DRIVER ASSEMBLY CRT ASSEMBLY (Order by Individual Parts) CRT WIRING ASSEM.
Table 5-3. Replaceable Parts (continued) Reference Designation A4 Assembly A5 Assembly h14 Assembly 415 Assembly HP Part Number 5063-0220 5063-0221 5063-0219 5063-0222 0515-1486 0515-2080 2190-0583 09.
Table 5-3. Replaceable Parts (continued) ic - 1 1 1 1 1 1 1 1 1 1 1 1 1 1 - Description CABLE ASSEMBLIES POWER CABLE, RIBBON CONTROL CABLE, RIBBON CABLE ASSEMBLY LINE SWITCH CABLE ASSEMBLY, RIBBON, OP.
Table 5-3. Replaceable Parts (continued) Reference HP Part C Qty Description Mfr Mfk Part Designation Number D Code Number CABLE ASSEMBLIES (CONTINUED) W16 8120-5676 0 1 CABLE ASSEMBLY, A10 RYTHM DRIVE 28480 8120-5676 (A14J9 to AlO) W18 5062-0721 8 1 CABLE ASSEMBLY, COAX 97, LO SWEEP 28480 5062-0721 0.
Table 5-3. Replaceable Parts (continued) Reference HP Part C Qty Description Mfi Mfr Part Designation Number D Code Number CABLE ASSEMBLIES (CONTINUED) W38 5022-0183 3 1 CABLE ASSEMBLY, SEMI-RIGID, 1S.
[tern HP Part Number 0515-1349 0515-2310 0515-3208 0515-2332 0515-0664 TOP VIEW BOTTOM VIEW KY sp126e Figure 5-1. Parts Identification, Assembly Mounting Qty Description 11 SCREW-MACH M3 X 30MM-LG PAN.
Parts List, Cover Assembly Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 HP Part Number 5041-8911 5041-8912 0515-1114 1460-2164 5021-6343 5021-6344 5021-8667 5001-8728 0515-1367 0515-1133 50.
Parts List, Main Chassis Item 1 3 4 5 6 7 8 9 10 11 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 A18MPl A18MP2 A18Vl A18Wl HP Part Number 0515-2145 0515-1715 0380-2052 5002-1010 0515-2309 .
Parts List, RF Section Item 1 2 3 4 6 7 8 9 11 12 13 14 15 18 19 20 22 23 HP Part C Number D 0515-1032 3 0515-2332 8 0515-2332 8 5021-7467 8 0515-2332 8 5002-1008 1 0515-1227 8 5002-1002 5 0515-1227 8.
Parts List, Front Frame Iten 5 6 7 8 8 8 9 10 11 12 13 14 15 16 17 18 19 20 n n HP Part c HP Part c Number D Number D 0515-1622 7 0515-1622 7 5041-8906 4 5041-8906 4 1000-0897 4 1000-0897 4 0370-3069 .
Parts List, Front Frame (continued) Item 21 22 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 1990-1131 5041-1682 0900-0010 0515-0664 5021-5482 0515-1143 0515-1934 2100-4232 3050-0014 2190-0067 2950-0072 0370-3079 5021-9320 C D s 2 9 1 9 0 9 2 5 3 7 4 - Qty 1 1 1 2 1 1 1 1 1 1 2 9 Description NUT-HEX-DBL-CHAM 3/8-32-THD .
Parts List, Rear Frame Item HP Part C Qty Description Number D 1 0515-1946 8 2 SCREW-MACH M3 GMM-LG FLH-HD TORX 2 5062-7755 3 1 BATTERY HOLDER (INCLUDES WIRES) 3 0515-2216 7 4 SCREW-MACH M4 40MM-LG PAN-HD TORX 4 3160-0309 5 1 FAN GRILL 5 0380-0012 0 4 SPACER-RND .
I _I- 8560E-Series I -I- sl134e Figure 5-2. Parts Identification, Cover Assembly I -I-.
8560E-Series sl131e FIGURE 5-3. PARTS IDENTIFICATION, MAIN CHASSIS / ‘v’.
8562E / /’ 89 /’ r (4 &ES) /- / y / -K / NOTES: 1. Do NOT remove the brackets from the Al0 assembly. If these brackets are removed and reinstalled, the performance of A10 will be altered. A new or rebuilt A10 assembly includes new mounting brackets already attached to it.
8562E sl128e / / / 12 (9 p3$CES) Figure 5-5 Parts Identification, Front Frame.
I -I- I -- 8562E AIY . / .,BTl (4 PLACES) '_ 11 12- ‘‘ (OPT9 001) SI 135e Figure 5-6. Parts Identification, Rear Frame I -- I -I- I.
6 Major Assembly and Cable Locations Introduction This chapter identifies the instrument assemblies and cables and contains the following figures: Figure 6- 1. Hinged Assemblies Figure 6-2. Top View (A2 Unfolded) Figure 6-3. Top View (A2 and A3 Unfolded) Figure 6-4.
Assemblies ....................................................... ..Figur e A19 HP-IB .......................................................... ..6- 4 A20 battery assembly .................................................. .6-9 A21OCXO .............
Cables ........................................................... ..Figur e W34 first LO Samp. (coax 0) .................................... 6-5, 6-6, 6-8 W35 int Second IF (coax 92) ........................................ 6-5, 6-8 W36 ext. Second IF (coax 86) (Deleted in Option 327) .
WHITE Al4 0” 0 0 0 0 A4 Al5 Figure 6-1. Hinged Assemblies A3 AIAIWI W25 YELLOW W23 / ORANGE A3Wl w22 BLACK W6 SK155 w20 BLUE (TO A2 IN NON-OPTION 007 TO Al6 IN OPTION 007) W24 GREEN w54 RED w59 ’ GRAY/ORANGE/WHITE w1 ‘A2 (OPTION 007) Figure 6-2.
w51 W2 / / W52 N5A A4 _ w55 w27 Figure 6-3. Top View (A2 and A3 Unfolded) SK157 Major Assembly and Cable Locations 6-5.
W27 ORANGE Wl A5 A19Wl A19 w3 W8 W52 WHITE w29 VIOLET AIAIWI A6Al A21 Al6 Al7 W55 LSI Al8 (OPTION 007) SPllOE Figure 6-4. Top View (A2, A3, A4, and A5 Unfolded) 6-6 Major Assembly and Cable Locations.
WI NOT I w2 w49 w50 w40 w22 w31 w37 w51 JSED w33 Figure 6-5. Bottom View (Al5 Unfolded) wig (OPTION 001) w35 W36 w34 w29 Al5 W32 sp166e Major Assembly and Cable Locations 6-7.
WI I (OPTION 005) w58 W I8 w32 A14 AIAI Al /WI3 WI0 w34 WI6 W I2 WI 1 Al5 W32 Figure 6-6. Bottom View (Al5 and Al4 Unfolded) 6-8 Major Assembly and Cable Locations.
w20 COAX 6 w7 w59 COAX a39 sj138e Figure 6-7. Al6 Fast ADC (Option 007) Major Assembly and Cable Locations 6-9.
W3 w45 W56 A8 FL1 Al3 FL2 W48 I W I2 All W I6 WI 1 Figure 6-6. HP 6562E Front End / / / / / / /’ I . W46 / w39 / / w42 /*’ / w34 - A10 - w43 ’ A9 SI 120e 6-10 Major Assembly and Cable Locations.
FL .4 Bl Figure 6-9. Rear View BTl/A20 SK162 Major Assembly and Cable Locations 6-l 1.
General Troubleshooting Introduction This chapter provides information needed to troubleshoot your spectrum analyzer to one of the six major functional sections. Chapters 8 through 13 cover troubleshooting for each of these sections. Before troubleshooting, read the rest of this introduction.
Assembly Test Points The spectrum analyzer board assemblies contain four types of test points: post, pad, extended component lead, and test jack. Figure 7-l illustrates each type of test point as seen on both block diagrams and circuit boards.
TEST POINTS ON BLOCK D I AGRAM J4 (TES T J TPI TP2 TP3 $P I @AMPLIFIER /-’ ;~f;N%,” J4-MS8 7 PIN NUMBER (J4-15) IL TEST POINTS ON CIRCUIT BOARD ASSEMBLY ACK) Figure 7-1.
I D GND D GND WI POWER CABLE A GND D GND +5v +5v +15v -15v PWR UP CONNECTIONS +28v A GND -15v -15v A GND SWEEP INPUT NC A GND NC NC . 50 49 . -15” l 48 47 . +15v POWER FOR r-------------- . 46 45 . +2av CONTROLLER . 44 43 l f5V AND INTERFACE . 42 41 .
I OA2 035 36 . OAl I I D CND . 37 38 . OAO I LINTFCE STB . 34 33 . DPKD CLK LINTFCE STB . 32 31 . ADC IRO D GND . 30 29 . LKEY RPG IRG D GND . 26 27 . +lOV REF D GND . 26 25 . CAL OSC TUNE D GND . 24 23 . HB ADC CLK 0 IA9 0 22 21 . IA10 A3Wl BKT PULSE .
Service Cal Data Softkey Menus The jumper on A2J12 is shipped from the factory in the WR PROT (write protect) position (jumper on pins 2 and 3). When the jumper is set to the WR ENA (write enable) position (jumper on pins 1 and 2), an additional service cal data menu is displayed under [CAL).
(-xi--) I . pKEq CAL 3RD AMP GAIN EXT MXR REF CAL PREV MENU * PRESEL ADJ key and the associated menu apply to the HP6561E/HP8563E only. t BAND 1 MXR BLAS key applies to HP8561 E only. m LO FREQ SAMPLER FREO SAMPLER HARMONIC FRAC N FREQ POSTSCLR RAW OSC FREQ sj 143e Figure 7-3.
Troubleshooting to a Functional Section 1. Refer to Table 7-l for the location of troubleshooting information. 2. If the HP 85629B test and adjustment module (TAM) is available, refer to “The TAM (Test and Adjustment Module)” in this chapter. 3. If error messages are displayed, refer to “Error Messages” in this chapter.
Table 7-1. Location of Assembly Troubleshooting Text Instrument Location of Troubleshooting Text Assembly AlAl keyboard Chapter 8. ADC/Interface Section AlA RPG Chapter 8. ADC/Interface Section A2 controller Chapter 10. Controller Section A3 interface Chapter 8.
TAM (Test and Adjustment Module) When attached to the spectrum analyzer rear panel, the HP 85629B test and adjustment module (TAM), in conjunction with the HP 8562E/TAM Interface Software, provides diagnostic functions for supporting the HP 85623 spectrum analyzer.
n Use the MS1 (Mass Storage Is) command to make the flexible disk drive the mass storage device. For example, you would type MS1 I’ : ,7OO,l” if the flexible disk was located at 700,l. w Type LOAD "TAMJFSW", 1 and press [ml or (m). The program will run immediately after it is loaded.
n After the power-on self-realignments are complete, press PASS CONTROL . This removes the computer as being the active controller on HP-IB, permitting the TAM to be the active controller. n The TAM functions are now available and are listed, along with any limitations.
Test Connectors The TAM uses a built-in dc voltmeter and DAC to measure voltages on any one of the “test connectors” (or test jacks) located throughout the spectrum analyzer. Revision Connectors One test connector on each assembly is reserved as a “revision connector.
Automatic Fault Isolation Automatic fault isolation (AFI) is designed to isolate most faults to one or two assemblies. AFI can be run with the spectrum analyzer cover in place and requires only the CAL OUTPUT signal as a stimulus. The entire procedure takes less than 2 minutes to complete if no failures are found.
LO Control Check The LO control check verifies that all phase-lock loops (PLLs) in the synthesizer section lock. Some oscillators are checked to ensure that they will lock outside their normal operating frequency range. The TAM also performs an operational check on several DACs in the synthesizer section.
RF Path Fault Isolation RF path fault isolation checks high-band RF paths. (Automatic fault isolation checks the low-band RF path.) An external microwave source with a frequency range of 5 GHz to 13.2 GHz is required. The source is not controlled over HP-IB.
Error Messages The spectrum analyzer displays error messages in the lower right-hand corner of the display. A number, or error code, is associated with each error message. These error messages alert the user to errors in spectrum analyzer function or use.
3. Use the up and down step keys to scroll through any other error messages which might exist, making note of each error code. Error Message Elimination When an error message is displayed, always perform the following procedure: 1. Press ISAVE) and SAVE STATE.
120 NOP ONOF ON/OFF are not valid arguments for this command. 121 NOP ARG AUTO/MAN are not valid arguments for this command. 122 NOP TRC Trace registers are not valid for this command. 123 NOP ABLK A-block format not valid here. 124 NOP IBLK I-block format not valid here.
202 FADC CAL 203 FADC CAL Binary search failed during FADC log offset calibration. This error applies only to spectrum analyzers with fast ADC (Option 007). 204 FADC CAL Binary search failed during FADC log expand offset calibration. This error applies only to spectrum analyzers with fast ADC (Option 007).
302 OFF UNLK 303 XFR UNLK 304 ROL UNLK 305 FREQ ACC 306 FREQ ACC Offset roller oscillator PLL is unlocked. May indicate loss of 10 MHz reference. The 10 MHz reference should measure greater than -7 dBm at A15J303.
307 FREQ ACC 308 FREQ ACC 309 FREQ ACC 310 FREQ ACC 311 FREq ACC 312 FREQ ACC Transfer oscillator pretuned DAC out of range. The transfer oscillator pretune procedure attempts to find pretuned DAC values by programming the PLL to 25 different frequencies and incrementing the transfer oscillator pretune DAC until XFRSENSE changes polarity.
313 FREQ ACC 314 FREQ ACC 315 FREQ ACC 316 FREQ ACC Error in LO synthesis algorithm. ERR 313 is set if a combination of sampler oscillator and roller oscillator frequencies could not be found to correspond to the required YTO start frequency. Contact the factory.
317 FREQ ACC Main coil coarse DAC at limit. The main coil coarse DAC is set to bring YTO ERR close enough to 0 volts for the main coil fine DAC to bring YTO ERR to exactly 0 volts. ERR 317 is set if the main coil coarse DAC is set to one of its limits before bringing YTO ERR close enough to 0 volts.
325 FREQ ACC 326 FREQ ACC 327 OFF UNLK 328 FREQ ACC 329 FREQ ACC Unable to adjust MAINSENSE to 0 volts using the fine adjust DAC. The coarse adjust and fine adjust DAC are used together to set MAINSENSE to 0 volts with the loop opened. ERR 32.5 is set if the fine adjust DAC cannot bring MAINSENSE to 0 volts.
600 MHz Reference Loop (333) This error requires troubleshooting the Al5 RF board assembly (synthesizer section) or the ADC circuits. 333 600 UNLK The 600 MHz reference oscillator PLL is unlocked. If error codes 302, 303, 304, 327 or 499 are also present, suspect the 10 MHz reference, the A21 OCXO, or the TCXO (Option 103), or the Al5 RF assembly.
YTO Loop Settling Errors (351 to 354) These errors are generated when the YTO loop error voltage will not stabilize at an acceptable value during the YTO loop locking routines. These errors only apply to the hardware in an HP 8560 E-Series spectrum analyzer.
360 SPAC CAL 361 SPAC CAL The start bucket correction is out of range. This error indicates a possible failure of the sweep generator on the Al4 frequency control assembly. Refer to “Sweep Generator Circuit” in Chapter 11, “Synthesizer Section.” The percent of span correction is out of range.
404 AMPL 10K 405 RBW 10K 406 RBW 1OK 407 RBW 1OK 408 RBW 1OK 409 RBW 1OK 410 RBW 10K 411 RBW 1OK 412 RBW 1OK 413 RBW IOK 414 RBW 10K Unable to adjust amplitude of 10 kHz resolution bandwidth. Errors 405 to 416: When these 10K resolution bandwidth (RBW) error messages appear, use the following steps to check for errors 581 or 582.
415 RBW 1OK 416 RBW 1OK 417 RBW 3K 418 RBW 3K 419 RBW 3K 420 RBW 3K 421 RBW 1OK 422 RBW 10K 423 RBW 1OK 424 RBW 10K 425 RBW 3K 426 RBW 3K 427 RBW 3K 428 RBW 3K 429 RBW C300 430 RBW 300 431 RBW 1K 432 .
449 RBW 10K 450 IF SYSTM 451 IF SYSTM 452 IF SYSTM 454 AMPL 455 AMPL 456 AMPL 457 AMPL 458 AMPL 459 AMPL 460 AMPL 461 AMPL 462 AMPL 463 AMPL 464 AMPL 465 AMPL 466 LIN AMPL 467 LOG AMPL 468 LOG AMPL 46.
489 RBW 100 490 RBW 100 491 RBW C300 492 RBW 300 493 RBW 1K 494 RBW 3K 495 RBW 10K 496 RBW 100 497 RBW 100 498 RBW 100 499 CAL UNLK Unable to adjust 100 Hz resolution bandwidth. Unable to adjust 100 Hz resolution bandwidth. Unable to adjust the resolution bandwidths less than 300 Hz.
502 AMPL .3M 503 AMPL 1M 504 AMPL 30K 505 AMPL .lM 506 AMPL .3M 507 AMPL 1M 508 AMPL 30K 509 AMPL .lM 510 AMPL .3M 511 AMPL 1M 512 RBW <300 513 RBW 300 514 RBW IK 515 RBW 3K 516 RBW 10K 517 RBW 100.
526 RBW (300 527 RBW <300 528 RBW <300 529 RBW <300 530 RBW <300 531 RBW X300 532 RBW C300 533 RBW <300 534 RBW <300 535 RBW <300 536 RBW <300 537 RBW <300 538 RBW <300 5.
559 LOG AMPL 560 LOG AMPL 561 LOG AMPL 562 LOG AMPL 563 LOG AMPL 564 LOG AMPL 565 LOG AMPL 566 LOG AMPL 567 LOG AMPL 568 LOG AMPL 569 LOG AMPL 570 LOG AMPL 571 AMPL 572 AMPL IM 573 LOG AMPL 574 LOG AMPL 575 LOG AMPL 576 LOG AMPL 577 LOG AMPL 578 LOG AMPL 579 LOG AMPL 580 LOG AMPL 581 AMPL Unable to adjust amplitude of log scale.
582 AMPL Unable to adjust 100 kHz resolution bandwidth and resolution bandwidths less than or equal to 10 kHz. Bad CALOSC Calibration in Sweep Rate. Test the 100 kHz resolution bandwidth filter 3 dB bandwidth as follows: 1. Connect the CAL OUTPUT signal (A4J8) to the INPUT 500.
583 RBW 30K Unable to adjust 30 kHz resolution bandwidth. 584 RBW IOOK Unable to adjust 100 kHz resolution bandwidth. 585 RBW 300K Unable to adjust 300 kHz resolution bandwidth. 586 RBW IM Unable to adjust 1 MHz resolution bandwidth. 587 RBW 30K Unable to adjust 30 kHz resolution bandwidth.
700 EEROM 701 AMPL CAL 702 ELAP TIM 703 AMPL CAL improper sequence of storing data in EEROM. Check the EEROM with the following steps: 1. Place the WR PROT/WR ENA jumper on the A2 controller assembly in the WR ENA position. 2. On the spectrum analyzer, press a MORE i SF 2, SERJfICE CAL DATA, FLATNESS ,and FLATNESS DATA.
RAM Check Errors (711 to 716) The instrument power-on diagnostics check the program RAM. This includes the two RAMS used for STATE storage. If any STATE information is found to be invalid, all data in that RAM is destroyed. A separate error code is generated for each defective program RAM.
System Errors (750 to 759) 750 SYSTEM 751 SYSTEM These errors often require troubleshooting the A2 controller and A3 interface assemblies. Hardware/firmware interaction, zero divide. Check for other errors. Hardware/firmware interaction, floating point overflow.
User-Generated Errors (900 to 999) 900 TG UNLVL 901 TGFrqLmt 902 BAD NORM 903 A > DLMT 904 B > DLMT 905 EXT REF 906 OVENCOLD 907 DO IF CAL 908 BW>>SPCG 909 SPANCACP 910 SPAN>ACP These error codes indicate user-generated errors. Tracking generator output is unleveled.
Block Diagram Description The spectrum analyzer is comprised of the six main sections listed below. See Figure 7-4. The following descriptions apply to the simplified block diagram and overall block diagram located at the end of this chapter. Assembly level block diagrams are located in Chapters 8 through 13.
RF Section The RF section includes the following assemblies: A7 SLODA (switched LO distribution amplifier) A8 low band mixer A9 input attenuator A10 YIG-tuned filter/mixer (RYTHM) All YTO (YIG-tuned o.
A9 Input Attenuator The attenuator is a 500 precision, coaxial step attenuator. Attenuation in 10 dB steps from 0 dB to 70 dB is accomplished by switching the signal path through one or more of the three resistive pads. The attenuator automatically sets to 70 dB when the spectrum analyzer turns off, providing ESD protection.
Third Converter (part of A15) The third converter down-converts the 310.7 MHz IF to 10.7 MHz. A PIN-diode switch selects the LO signal used. For normal operation, a 300 MHz LO signal is used.
Synthesizer Section The first LO uses four PLLs to phase-lock to the internal 10 MHz standard in the instrument. See Figure 7-5. The reference PLL supplies reference frequencies for the instrument. The three remaining PLLs tune and phase-lock the LO through its frequency range.
Offset Lock Loop (part of A15) The 285 MHz to 297.2 MHz sampling oscillator is used to sample the YTO. The frequency can be changed by changing the programmable dividers of the offset lock loop. ,- YTO PLL -, ,p FRACTIONAL N PLL------- 1ST LO OUTPUT 3.
IF Section The IF section processes the 10.7 MHz output of the RF section and sends the detected video to the ADC/interface section. The following major assemblies are included in this section: A3 int.
A5 IF Assembly The A5 IF assembly has four crystal filter poles, four LC filter poles, and step gain amplifiers. The crystal filters provide resolution bandwidths of 300 Hz to 10 kHz. The LC filters provide resolution bandwidths of 30 kHz to 2 MHz. All filter stages are in series.
Digitally filtered video bandwidths use a sample detector. When sample detection is selected, the effective video bandwidth is limited to approximately 450 kHz. When a digital filter is selected, a D appears along the left edge of the CRT, indicating that something other than the normal detector mode is being used.
Display ASM Much of the miscellaneous digital control is performed by A2UlOO. UlOO functions as the display ASM (algorithmic state machine) and character ROM. It also converts the 16-bit CPU data bus to an 8-bit data bus for the rest of the spectrum analyzer.
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8 ADC/lnterface Section The ADC/Interface section includes the AlAl keyboard, AlA RPG (rotary pulse generator), A3 interface, and Al6 fast ADC (Option 007) assemblies.
Trigger 16-Bit Post-Trigger Counter 15-Bit (32 K) C ircular Address Counter Video Trigger Comparator Table 6-1. W2 Control Cable Connections Signal DO D GND Dl D2 D3 D4 D GND D5 D6 D7 A0 D GND Al A2 A.
Table 6-1. W2 Control Cable Connections (continued) Sianal A GND RF GAIN LO3 ERR A GND LVFC-ENABLE FC ERR A GND YTO ERR +lOV REF A GND SCAN RAMP VIDEO TRIGGER A GND NC R/T DAC2 R/T DACl A3J2 (pins) 35.
Troubleshooting Using the TAM Refer to Chapter 7, “General Troubleshooting,” for information on enabling the TAM for use with the HP 85623 Spectrum Analyzer. When using Automatic Fault Isolation, the TAM indicates suspected circuits that need to be manually checked.
Table 8-2. Automatic Fault Isolation References Suspected Circuit Indicated by Automatic I?ault Isolation Check ADC ASM Check ADC MUX Check ADC Start/Stop Control Check Analog Bus Drivers Check Analog.
Table 8-3. TAM Tests versus A3 Test Connectors Connector A3J 105 A3J400 Video Input to Interface Video to Rear Panel Video MUX LOG Offset/LOG Expand Video Filter Buffer Amp.
Keyboard/RPG Problems Keyboard Interface Refer to function block G of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. A pressed key results in a low on a keyboard sense line (LKSNSO through LKSNS7).
9. If LKBD-RESET is incorrect and a pulse is not present at each of. the LKSCN outputs of U602 when a key is pressed, check for LWRCLK and LSCAN-KBD. RPG Interface Refer to function block J of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information.
15. Press m to turn spectrum analyzer off. 16. Reconnect AlAlWl to A3J602 and remove all jumpers. Table 8-5. Counter Frequencies A3U606 pin # Nominal Frequency (Hz) 3 3900 4 1950 5 975 6 488 11 244 10.
3. Check that the appropriate trigger MUX input signal is present at the trigger MUX output (A3U613 pin 7). 4. To check the video trigger level DAC, connect the positive lead of a DVM to A3J400 pin 1 and the negative DVM lead to A3TP4. 5. Press (TRIG) and BIDE0 .
f. Press the following keys on the oscilloscope: @EAR DwLAYJ off frame axes grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight grid connect duts off on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight on m aouxce 1 2 3 4 .
Preselector Peaking Control (Real Time DAC) Refer to function block H of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The spectrum analyzer uses a real-time DAC (R/T DACl) to peak the preselector.
Flatness Control (RF Gain DACs) Refer to function block M of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. RF Gain DACs control the Al5 assembly flatness compensation amplifiers. The RF Gain DACs are arranged so that the output of one DAC is the voltage reference for the other DAC.
A3 Assembly Video Circuits Voltages from A3JlOl to the A3 Variable Gain Amplifier correspond (approximately) to on-screen signal levels. (One volt corresponds to the top of the screen and zero volts corresponds to the bottom of the screen.
Note The on-screen amplitude level will probably not change as expected, since the video circuitry is assumed to be faulty. 15. Monitor ASTP14 while stepping the reference level from -10 dBm to j-30 dBm. If the voltage does not step approximately 100 mV per 10 dB step, refer to “Video MUX” in this chapter.
2. Disconnect W26 (coax 2) from A3JlOl and connect the output of a function generator to A3JlOl. 3. Set the function generator to the following settings: Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. 6. 7. 8. 9. 10. c. If the logic signals are incorrect, refer to “Analog Bus Timing” and “Analog Bus Drivers” in this chapter. Check comparators A3U109A/C for proper outputs. The outputs should be high when the noninverting input is greater than the threshold voltage of t1.
5. Refer to Table 8-7 and check for correct latched levels for the selected video bandwidth setting. 6. If the output of latch A3U102 is not correct, trigger an oscilloscope on LLOG-STB (U102 pin 9) and monitor U102 pin 1 and other latch inputs while changing the video bandwidth.
Positive/Negative Peak Detectors Refer to function blocks Y and Z of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The following information pertains to the positive peak detector and is applicable to troubleshooting the negative peak detector.
7. If the peak detector appears latched up, check LPOS-RST (U422 pin 4) for a negative TTL level reset pulses. The reset pulses should occur every 130 ps and should be approximately 250 ns wide. 8. If the reset pulses are absent, troubleshoot the Peak Detector Reset circuitry.
Rosenfell Detector Refer to function block S of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. If both HPOS-HLDNG and HNEG-HLDNG are high during the same bucket, HROSENFELL will also be set high.
1. Set the spectrum analyzer to the following settings: Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..300MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Press (CAL) and IF 11l)J UN and check for the presence of the CAL OSC TUNE signal by monitoring A3J401 pin 25 with an oscilloscope. If ERR 499 CAL UNLK is displayed and a signal within the range of -10 V to +lO V is present during part of the retrace period, the fault is on the A3 assembly.
A3 Assembly ADC Circuits The ADC consists of a 12-bit DAC, 12-bit successive approximation register (SAR), data multiplexers, and data latches. The ADC ASM (algorithmic state machine) controls the ADC.
ADC Start/Stop Control Refer to function block B of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The ADC Start/Stop Control determines the start time of all ADC conversions. Multiplexer A3U509 chooses the source of the start signal.
ADC ASM Refer to function block F of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. 1. Press (PRESET) on the spectrum analyzer and set the controls as follows: Span . . . . . . . . . . . .
comparator U512 does not toggle back and forth during a conversion, suspect either U512 or one of the clipping diodes (CR500/CR501). Note Because currents are being summed at U512 pins 2 and 3, voltage levels at these points are difficult to interpret.
A3 Assembly Control Circuits A digital control problem will cause the following three steps to fail. 1. On the spectrum analyzer, press (i$Kii%Z), ATTEN MAN, 7, 0, and (dB. 2. A click should be heard after pressing dB in step 1, unless ATTEN was previously set to 70 dB.
13. Check that address lines A0 through A7 and data lines DO through D7 are all high. If all address and data lines are high, suspect a fault either in W2 or one of the other four assemblies which connect to W2. 14. If any address or data line is low, check the appropriate input of either U405 (data lines) or U406 (address lines).
11. Monitor A3U401B pin 7 (LIF-STB) with an oscilloscope or logic probe. This is the strobe for the A5 IF assembly. 12. Press (AMPLITUDE] and check that pulses occur when toggling between REF‘ LVL settings of -10 dBm and -20 dBm. 13. Monitor A3U401B pin 9 (LLOGSTB) with an oscilloscope or logic probe.
Al6 Assembly Fast ADC Circuits (Option 007) The fast ADC consists of video signal scaling and limiting amplifiers, an 8-bit flash ADC, peak/pit detection of the digitized video signal, a 32 K-byte RAM, and the fast ADC control circuitry.
11. Measure the dc level of the flash video at TP27. The level should be near 0 Vdc with the signal at the bottom graticule line (no input to the spectrum analyzer). 12. Connect the CAL OUTPUT to the INPUT 500 connector. 13. Measure the dc level of the flash video at TP27.
Peak/Pit Detection Refer to function block J of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. Peak detection or pit (negative peak) detection can be enabled whenever the sample rate is less than 12 MHz (sweep times greater than 50 ps).
Al6 Assembly Fast ADC Control Circuits (Option 007) The fast ADC control circuits consist of the CPU interface and control registers, the reference clock, a clock and sample rate generator, a trigger circuit, a 16-bit post-trigger counter, a 15-bit circular address counter, a video trigger comparator, and the reference and power supply circuits.
Table 8-13. Control Word at Primary Address (U3 and U4) (continued) Bit Mnemonic Bit 2 GAINX2 Bit 3 VTRIG-POL Bit 4 LSAMPLE Bit 5 LADCEN State Description Turns on X2 log expand amplifier. 1 A16U43 turned on. (5 dB/div or 1 dB/div scale) 0 A16U43 turned off.
Table 8-13. Control Word at Primary Address (U3 and U4) (continued) Bit Bit 10 Bit 11 LREADADDR Bit 12 LRATELATCH Bit 13 LRLSHSWP Bit 14 LLOADTRIG Bit 15 LPEAK Mnemonic LREADMEM State Description Enables read FADC memory. Read FADC memory disabled. Read FADC memory enabled.
Clock and Sample Rate Generator Refer to function block C of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The clock and sample rate generator takes the 24 MHz reference clock signal and generates all of the various clock signals used on the Al6 fast ADC assembly.
16-Bit Post-Trigger Counter Refer to function block E of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The 16-bit post-trigger counter controls the number of static RAM memory locations that will be written after the trigger occurs.
Video Trigger Comparator Refer to function block M of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. This 8-bit digital magnitude comparator, U34, compares the digitized samples from the flash ADC (latch U29 output) to the programmed video trigger level.
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HP 8560 E-SERIES FAST ADC (OPTION 007) w59 BLOCK DIAGRAM FROM A2J15 1 P/O A3 I I I I I I I I I I I I I INTERFACE ASSEMBLY JlOl ----- 1 PEAK, I Tql6 I QE” Q a5 w---w L--W- VIDEO BUFFER 1 J102 1 Xl I .
9 IF Section The IF Section contains the A4 log amplifier/Cal oscillator and A5 IF assemblies. Troubleshooting Using the TAM Troubleshooting the Log Amplifier with the TAM Troubleshooting A5 with the .
Inadequate CAL OSC AMPTD Range 300 Hz to 3 kHz Resolution Bandwidth Out of Specification Low-Pass Filter Sweep Generator AM/FM Demodulation, Audio Amplifier, and Speaker 9-2 IF Section.
Note Because the cal oscillator circuitry on the A4 assembly is such an integral part of the IF adjustment, always check this assembly first, before checking the rest of the IF Section. A faulty cal oscillator can cause many apparent “faults” in the rest of the IF Section.
Table 9-1. Automatic Fault Isolation References Suspected Circuit Indicated by Automatic Fault Isolation Manual Procedure to Perform Check Cal Oscillator on A4 Assembly Troubleshooting the Cal Osc wit.
Table 9-2. TAM Tests versus Test Connectors Connectc A3J105 A3J400 A4J9 A4JlO A4Jll A5J6 Manual Probe Troubleshooting Te: Video Input to Interface Video to Rear Panel Video MUX Log Offset/Log Expand V.
Table 9-2. TAM Tests versus Test Connectors (continued) Connector A5J7 A5J8 A5J9 Manual Probe Troubleshooting Test Ref 15 dB Attenuator Stage 2nd Step Gain Stage 2nd/3rd Step Gain Stage 3rd Step Gain .
-“-“-“-“-” ; A5 IF ASSEMBLY -m--m---- RESOLUTION BANDW I OTH I 10.7 MHz IF ADJ OFF EANDWI DTH ( WHITE ) 1 --------------- J I CAL OSC I +lV DC L---------, IF ADJ OFF w54 DISCONNECTED J3 +-is- I I LINEAR j+J- D- w54 J4 ,‘-, J LOG I u (RED) ) ? I WITH COUNTER ON I BURSTS OF 5.
3. Set the other spectrum analyzer controls as follows: Span .......................................................... ..5MH z Reference level ................................................ -20 dBm Center frequency .................................
Table 9-3. Sweep Width Settings Sweep Width Sweep Time Res BW RANGE MA1 MAO Adjusted A4U105 A4U105 A4U105 Pin6 Pin2 Pill5 20 kHz 5 ms 10 kHz +5 v ov ov 10 kHz 10 ms 3 kHz +5 v ov +5 v 4 kHz 30 ms 1 kH.
4. If a -35 dBm signal does not appear, the cal oscillator is probably at fault. Parameters Adjusted The following IF parameters are adjusted in the sequence listed: 1. Amplitude A. Video Offsets: analog (using log amplifier video offset DAC) and digital (applying stored constant to all readings) 1.
3. Crystal Bandwidths A. The cal oscillator sweep rate is measured against the 100 kHz resolution bandwidth filter skirt. This result is used in compensating the sweeps used for adjusting the crystal bandwidths. B. 10 kHz resolution bandwidth 1. Center frequency of LC tank that loads the crystal 2.
Performance Test Failures Failures in IF-Section-related performance tests may be investigated using the following information. IF Gain Uncertainty Performance lest Failure of this performance test indicates a possible problem with the spectrum analyzer IF gain circuits.
Resolution Bandwidths Performance Tests Most resolution bandwidth problems are a result of A5 IF assembly failures. The resolution bandwidths are adjusted in the following sequence using 300 kHz as the reference: 1 MHz, 2 MHz, 100 kHz, 30 kHz, 10 kHz, 3 kHz, 1 kHz, 300 Hz, 100 Hz, 30 Hz, 10 Hz, 3 Hz, and 1 Hz.
3. Set the HP 85623 spectrum analyzer to log mode, with a resolution bandwidth of 300 l&z and single sweep. 4. Using the DMM, check the voltage at U503 pin 6. 5. Verify that this level is about -700 mV. 6. Adjust the source amplitude to place the signal at the reference level.
Total gain can be measured by injecting the specified power into A4J3 and measuring the total gain provided by A4U201C and A4U201E. The following procedure provides a means of troubleshooting the linear amplifiers: 1.
Video Output 1. On the HP 85623 spectrum analyzer, press C-1, C-1, 300 m, (SPAN), 100 (Hz), (m), -10 dBm, [WSWP), a and IF BJ OFF . 2. Connect the CAL OUTPUT to the INPUT 500 connector. 3. Disconnect W54 (coax 2) from A4J4. Connect a short SMB to SMB cable from A4J4 to an SMB tee and connect W54 to the tee.
2. If an FM signal cannot be demodulated, perform the Demodulator Adjustment procedure. If the output of A4C707 cannot be adjusted as described in the Demodulator Adjustment procedure, troubleshoot the FM Demodulator or Audio MUX circuits on A4.
6. Set the HP 8566A/B as follows: 7. 8. Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The center frequency of the 300 Hz resolution-bandwidth filters and the 1 Hz to 100 Hz filters should differ no more than 10 Hz. If the center frequency is different by more than this, or if no signal is present in the 1 Hz to 100 Hz resolution-bandwidth settings, troubleshoot the 10.
amplifier. A4CR302 and A4CR303 are varactor diodes in the limiter filter and are used to tune the filter. Limiter Refer to function block G of A4 Log Amplifier Schematic Diagram (sheet 2 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information.
The gain is then: This gives an offset-independent gain measurement. Video MUX The video MUX switches the video output between linear, log and 4.8 kHz IF (for digital RBWs). The demod video is an unused feature. The easiest way to troubleshoot this circuit is to look for blown FETs.
The assembly contains a reference limiting amplifier. This amplifier provides a known amount of limiting for the automatic IF adjustment routines. (Limiting occurs only during the automatic IF adjustment routines.) The LC34Short switches are open during sweeps.
Centerfrequency ............................................ ..30 0 MHz Span ........................................................... . MHz 10. On the’HP 85623 spectrum analyzer, press (SGL-) and (CAL). II. Simultaneously press I-1 on the HP 8566A/B and ADJ CUR& IF STATE on the HP 85623 spectrum analyzer.
Detailed IF adiust Sionature (11 MKR 504.4 msec 5 dB/ SAMPLE hP REF -5.0 dBm ‘-ATTiN’ dB- ’ ’ -43.30 dBm ( 2ND STEP 1 STEP STAGE nl II rll 3RD STEP GAIN STAGE II I WFP- 2ND STEP ’ CENTER 10.700 000 MHz SPAN 0 Hz RES BW 300 kHz VBW 300 kHz SWP 550 msec sp144e Figure 9-4.
set dBm MKR I. 834 -14.60 Detailed If Adjust Signature (3) CENTER 10.700 000 MHz SPAN 0 Hz RES BW 300 kHz VBW 300 kHz SWP 2.00 set Figure 9-6. Detailed IF Adjust Signature (3) Detailed If Adjust Signature (4) -5.0 dBm ATTEN 10 dB MKR 1.284 set t LOG OFYSETS CENTER 10.
Detailed If Adiust Sinnnture (Sl MKR 1 854 <cc 10 dB/ SAMPLE 1 IIilI I --- - -, -510 cjBm,-‘-ifTiN= dB ..-_. ___ hP REF -84.40 dBm I I II ill I LC POLE LC POLE LC POLE - SETTINGS PAST HERE ARE FOR AUTOMATIC ADJUSTMENT OF THE 30kHz RESOLUTION BANDWIDTH CENTER 10.
REF 10.0 dBm ATTEN 20 dB CENTER l3klB 10.700 000 MHz RES BW 300 kHz REF 10.0 dBm 5 dB,’ SAMPLE ATTEN 20 dB I I I I I I I I III SPAN 0 Hz CENTER 10.700 000 tv IHZ RES BW 300 kHz VBW 300 kHz SWP 500 set SK179 VBW 300 kHz SPAN 0 Hz SWP 500 set SK178 Figure 9-9.
:F 10.0 dBm ATTEN 20 dB RE 5 dB,’ SAMPLE CENTER I I I 10.700 000 MHz SPAN 4) H7 - .-.._ RES BW 300 kHz VBW 300 kHz SWP 500 set Figure 9-11. Region B Amplitude Variation REF 10.0 dBm ATTEN 20 dB I I I I I I I I I 4 I 5 dB/ SAMPLE CENTER 10.700 000 MHz SPAN 0 H7 RES BW 300 kHz VBW 300 kHz SWP 560 s.
1 MHz Resolution Bandwidth Problems Check the crystal shorting switches as follows: 1. On the HP 85623 spectrum analyzer, press (-1 and set the controls as follows: Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*ATTEN 10dB RL 0dBm lOdB/ I I I CENTER 300.0000MHz *RBW 1.0MHz VBW 1 .BMHz SPAN 3.000MHz SWP 50ms SK183 Figure 9-14. Faulty LC Pole 30 kHz Resolution Bandwidth Problems Shape factor too high: Shape factor is the ratio of the 60 dB bandwidth to the 3 dB bandwidth.
Narrow 10 kHz resolution bandwidth: Check for printed-circuit board contamination. Clean the board as required. IF Gain Compression in 10 kHz resolution bandwidth: FET transistors Q202, Q203, Q501, and Q503 can deteriorate with age. Measuring less than 0 volts on the FET source indicates a bad FET.
Cal Oscillator (P/O A4 Assembly) The cal oscillator on the A4 assembly supplies the stimulus signal for automatic IF adjustments. Normally, the oscillator operates only during retrace (for a few milliseconds) to adjust part of the IF. (All IF parameters are to be readjusted about every 5 minutes.
2. If the cal oscillator remains locked (no error code ERR 499 displayed) but does not have the correct output level, troubleshoot the output leveling circuitry (function blocks AA, AB, and AC) or output attenuator (function block AD). Cal Oscillator Unlock at Beginning of IF Adjust 1.
c. Press FULL IE ADJ . Observe the DVM reading between the displayed messages IF ADJUSTSTATUS: 300 kHz RBW and IF ADJUST STATUS: 3 kHz RBW. Duringthistime period, the voltage should be within a 2 to 10 Vdc range. d. Observe the DVM reading while IF ADJUST STATUS: AMPLITUDE is displayed.
13. Figure 9-17 illustrates normal operation. Severe failures (slope error greater than 30 percent) and subtle 3 kHz resolution bandwidth errors (less than 30 percent) indicate a problem with A4U802, A4U803, A4U804, or A4U106. 14. Severe failure of the bandwidth accompanied by subtle errors in the output signal indicate an A5 failure.
Output Waveform, 3 kHz Resolution Banclwiath 4J AEF -40.0 dE4m ATTEN 10 dB I r(m/ I I I I II I I I I CENTER I I I I I I , I I 1 10.800 000 MHz SPAN 0 HZ RES BW 100 kHz VBW i0 kHz SWP 50.0 mssc Figure 9-17. Output Waveform, 3 kHz Resolution Bandwidth Output Waveform.
Output Wavaform. 300 Hz Rasolution Bandwidth rp REF -37.0 dBm ATTEN 10 08 1 d8/ CENTER 10.7i0 000 Mlit SPAN 0 Hz RES BW i0 kt-lz VBW 1 kHz SWP 200 msec Figure 9-19. Output Waveform, 300 Hz Resolution Bandwidth RE .F -43.0 dBm ATTEN 10 dB 1 dB/ CENTER I I I I 10.
Low-Pass Filter Refer to function block AB of A4 Log Amplifier Schematic Diagram (sheet 4 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information. 1. Connect a DVM positive probe to A4J9 pin 4. 2. On the HP 85623 spectrum analyzer, press (CAL).
3. Adjust the HP 85623 spectrum analyzer reference level and center frequency to display the 400 Hz modulation frequency eight divisions peak-to-peak. 4. On the HP 85623 spectrum analyzer, press (m), B/FM DEMOI), Mf DF,MOD flly, and set the sweep time to 5 seconds.
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10 Controller Section The controller section includes the A2 controller assembly, A19 HP-IB assembly, and BTl battery. The presence of a display (graticule and annotation) verifies that most of A2 controller assembly is operating properly.
Note When measuring voltages or waveforms, make ground connections to A2TP3. The metal board-standoffs are not grounded and should not be used when taking measurements. Troubleshooting Using the TAM Refer to Chapter 7, “General Troubleshooting,” for information on enabling the TAM for use with the HP 85623 Spectrum Analyzer.
7. Move the probe cable to A2J202. Press SOFT KEY #I and wait 5 seconds. 8. Press SDFT KEY #4 . The results should be sent to the printer. 9. If a failure is indicated in any of these tests, the fault lies on the A2 controller assembly. To obtain more information: a.
Digital Signature Analysis (DSA) Digital signature analysis (DSA) places microprocessor, A2U1, in a simplified known state. This simplified state consists of placing a one-word instruction, MOVE QUICK, (0111 xx10 xxxx XXXO) on the data bus. The microprocessor cycles through its address range continually reading the instruction.
5. Compare the signals at the following test points with those illustrated in Figure 10-2. x POS: A2J202 pin 14 Y POS: A2J202 pin 3 Z OUT: A2J201 pin 3 BLANKING: A2J202 pin 15 Note Waveforms displayed on an analog scope may show considerably more spikes.
4. Compare the blanking-circuit input signals at the following test points with those illustrated in Figure 10-3. BLANKING: J202 pin 15 BLANK: U214 pin 12 VECTOR: U214 pin 11 U213 pin 13 5. The waveforms in Figure 10-3 must match the timing of the vectors being drawn.
4.00 V/div 2.50 V 2.0 us/div 96.00 us I I I I I I I I I I I U213-13 BLANKING i nr I II II II Figure 10-4. Expanded Blanking Waveforms SK193 Display Jumbled or Trace Off Screen Refer to function blocks D and I of A2 controller schematic diagram (sheet 1 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information.
7. 10.0 V/div 0.00 v 20.0 us/div 0.000 s INTEGRATE SAMPLE LCHAR VECTOR I I II III I II I I I I I I I I I I I I SK194 Figure 10-5. Switch Driver Waveform LCHAR All of the DAC inputs should change state two or more times within a 5 ms window.
12. Figure 10-7 illustrates the waveforms in step 11 expanded to show relative timing. the second and fourth traces are delayed by 5 ms from the first and third. The oscilloscope settings are changed as follows: Sweep time . . . . . . . . . . . . . . .
800 V/div 0.00 v 10.0 us/div 0.000 s U20 IA-I TP2 U’203A- 1 TPl , I 1 r r-7 I7 I SK197 Figure 10-6. Normal X/Y Line Generator Waveforms Intensity 1. 2. 3. 4. 5. 6. The length of the vector being drawn can effect intensity. U210A, U21OC, and U210D sum the lengths of the X and Y vectors.
Long Lines Dimmer Than Short Lines Refer to function block M of A2 controller schematic diagram (sheet 1 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The Z output function block contains the absolute value circuits which determine the intensity of vectors drawn on the display.
9. The waveforms should look like those illustrated in Figure 10-10. If the waveform at J201 pin 14 is bad, troubleshoot the Y line generator (function block I of A2 controller schematic, sheet 1 of 4). 10. If the waveform at U210D pin 14 is bad, troubleshoot the Z output circuit (function block M of A2 controller schematic, sheet 1 of 4).
5.00 V/div 0.00 v 5.0 ms/div 0.000 s I I DEF 1 x POS Y POS SK1 100 Figure 10-l 1. DEFl Synchronization Frequency-Count Marker Problems The FREQ COUNT function works by dividing the 10.
Frequency Counter See function block Z of A2 schematic diagram (sheet 4 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The frequency counter counts the frequency of the last IF and provides accurate timing signals for digital zero-spans.
1. Disconnect W22 from A2J8. 2. If a 10 MHz, TTL-level signal is not present at the end of W22, continue with step 3. If a 10 MHz signal is present at W22, proceed as follows: a. Reconnect W22 to A2J8. b. Set the spectrum analyzer to the following settings: Span .
Keyboard Problems If the analyzer does not respond to keys being pressed or the knob being rotated, the fault could be either on the A3 interface assembly or the A2 controller assembly. To isolate the A2 controller assembly, use the following procedure.
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II Synthesizer Section The synthesizer section includes the A7 switched first LO distribution amplifier, the All YTO, and parts of the Al4 frequency control and Al5 RF assemblies. Simplified and detailed block diagrams for each assembly are located at the end of this chapter.
Phase Noise Problems Phase Noise in Locked versus Unlocked Spans Reference versus Reference PLL Phase Noise Fractional N versus Offset PLL or YTO PLL Phase Noise Fractional N PLL Phase Noise Sampler and Sampler IF Sweep Generator Circuit A21 OCXO Caution All of the assemblies are extremely sensitive to electrostatic discharge (ESD).
J302 J301- Al4 FREQUENCY CONTROL J501 J304 J7 J23 J17 J15 JZOO ’ J16 J18 J19 (REVISION CONNECTOR) J602 / Al5 RF J502 I J901 ( REVISION J501 I CONNECTOR) JIOI A15d2Jl J400 sp128e Figure 11-l. Al4 and Al5 Test Connectors PIN 2 . . . . . l l . PIN 16 PIN 1 n .
Table 11-2. Automatic Fault Isolation References Suspected Circuit Indicated by Automatic Fault Isolation Check the YTO loop Check first LO Check first LO pretune frequency and amplitude Check the fra.
Table 11-2. Automatic Fault Isolation References (continued) Suspected Circuit Indicated by Automatic Fault Isolation Manual Procedure to Perform Check offset span accuracy Check phase/frequency detec.
Table 11-3. TAM Tests versus Test Connectors Connector A14J15 A14J16 A14J17 A14J18 A14J19 A143302 Manual Probe Troubleshooting Test Sweep generator Span attenuator DAC Span attenuator switches Sweep + tune mult input amp Sweep + tune mult input switches FAV generator FAV generator 0.
Table 11-3. TAM Tests versus Test Connectors (continued) Connector A15J200 A15J400 A155502 A15J602 A15J901 Manual Probe Troubleshooting Test Positive 15 volt supply Sampler drive buffer bias Sampling .
Troubleshooting Test Setup Some synthesizer section problems require placing the YTO PLL in an unlocked condition. This is done by moving jumper A14J23 to the TEST position. This grounds the YTO ERROR signal, disabling the ability of the CPU to detect an unlocked YTO.
Check A3 ADC MUX Function Block (steps 1-4) 1. Connect the positive lead of a DVM to A15J200 pin 13 and the negative lead to A15J200 pin 6. This measures the sampling oscillator tune voltage which is an input to the A3 interface assembly ADC MUX. 2. Set the spectrum analyzer to the following settings: Span .
Check First LO (steps 9-11) 9. Connect the CAL OUTPUT to INPUT 50R. 10. Set the spectrum analyzer to the following settings: Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..300MHz Span . . . .
17. Tune the source 1 kHz above the fractional N frequency. The voltage measured on the DVM should be approximately -12 Vdc. 18. If the DVM reading does not change, the Al4 frequency control assembly is defective. Reconnect W32 to A14J501. Replace the jumper on A14J23 to the NORM position.
BNC CABLE FREQUENCY COUNTER TEST CABLE A 15’J 10 1 Al&J100 Jl sm624e Figure 1 l-4. Sampler and Sampling Oscillator Test Setup 25. At each combination, the frequency counter should measure a sampler IF as shown in Table 11-5. (The sampling oscillator of the offset PLL tunes to the frequencies listed in the table.
Table 11-5. Sampling Oscillator Test Frequencies HP 8340A CW Frequency (GHz) 6.067000 6.087000 6.110200 6.141000 4.710000 6.174000 6.193000 6.213000 6.066000 6.069000 6.247000 6.107000 3.912000 6.289000 6.321000 6.333000 HP 85633 Center Frequency (MHz) Offset PLL Sampling Oscillator Freq (MHz) Counter Reading Sampler IF (MHz) 2156.
PRETUNE r 1 I DOWN I--- - -h ‘t - I REF- ( Y 1 1 REFERENCE INPUT UP ALTERNATE --I sp129e Figure 11-5. PLL Locked at Wrong Frequency 11-14 Synthesizer Section.
Unlocked PLL An unlocked PLL can be caused by problems inside or outside the PLL. Troubleshoot this problem by working backward from the oscillator as described in the steps below.
4. Confirm proper power levels for the signals at the input to the “N” dividers (4), the reference inputs (5 and 7), and the loop feedback path (6). Unlocked Reference PLL Operation The 600 MHz reference is generated by tripling, then doubling the output of the 100 MHz phase-locked loop.
Check 10 MHz reference to phase/frequency detector (steps 9-14) 9. On the spectrum analyzer, press (mCTRL), REAR PANEL , and 10 MHz INT . 10. Check the 10 MHz reference frequency-accuracy by connecting a frequency counter to A15J301 and verify that the reference frequency is 10 MHz f40 Hz after a 5 minute warmup period.
22. To remove the divided-down 100 MHz signal from the phase/frequency detector, short R595. Refer to function block X of Al5 RF schematic. Check the 100 MHz lock loop integrator (steps 23-27) 23. Remove 10 MHz reference input to the phase/frequency detector by pressing (ZKYiKCTRL), EEAE PAEEL, and 10 MHZ EXT.
31. Measure voltage at U507B pin 5 while adjusting R561. This is the temperature- compensated adjustable voltage reference to which the detected voltage is compared.
Unlocked Offset Lock Loop (Sampling Oscillator) Operation The offset lock loop drives the A15UlOO sampler. The offset lock loop sampling oscillator tunes to one of sixteen discrete frequencies between 285 MHz and 297.
9. If the signal is not measured near the indicated power, troubleshoot the offset lock loop buffer (function block AM of Al5 RF schematic sheet 3 of 4). Table 11-6. Sampling Oscillator PLL Divide Numbers sampling Center Reference Reference Oscillator Frequency* Divide Frequency Frequency (MHz) Chain (MHz) (MHz) Prescaler Postscaler 285.
13. If the IF signal is not near the indicated power, troubleshoot the loop mixer (function block AI). Check path to phase/frequency detector (steps 14-19) 14. Measure the loop IF signal at the input to the IF amplifier/limiter (function block AK): A15L428 (end nearest U411) 4 MHz (approximately -6 dBm) 15.
Unlocked YTO PLL Operation The All YTO is locked to two other oscillators, the fractional N oscillator and the offset PLL sampling oscillator. For LO spans of 2.01 MHz and above, either the FM or main coil of the YTO is swept directly. For LO spans of 2 MHz and below, the fractional N oscillator is swept.
In fractional N spans (LO Spans 12 MHz) the YTO remains locked to the sweeping fractional N PLL. Thus, the sampler IF must always equal the fractional N oscillator frequency (conditions for lock).
Troubleshooting an Unlocked YTO PLL 1. If the YTO PLL is unlocked, error code 301 should be displayed. Place the spectrum analyzer in ZERO SPAN. Figure 11-7 illustrates the simplified YTO PLL. 2. Move the jumper on A14J23 to connect pins 2 and 3 (TEST position).
5. Calculate the YTO frequency error by subtracting the frequency recorded in step 3 from the frequency recorded in step 4. Record the result below: YTO Frequency Error = MHz YTO Frequency Error = YTO Frequency (MEASURED) -YTO Frequency(cALcuLATED) 6.
Check the fractional N oscillator (steps 13-17) 13. Set the spectrum analyzer to the following settings: Centerfrequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz Span . . . . . . . . . . . . . . .
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..300MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz 29. Connect an RF signal-generator output to A14J501.
Table 11-8. Voltages in FM Coil and Main Loop Drivers Measurement Points Voltages A14U405 pin 6 +2.8 Vdc A14U322 pin 2 0 Vdc A14J17 pin 4 >+10 Vdc Check main coil coarse and fine DACs (steps 41-44) 41. The main coil coarse and fine DACs correct any initial pretune errors in the YTO main coil.
50. If the spectrum analyzer center frequency is 300 MHz, the voltage at A14J18 pin 3 should measure -3.35 V f0.25 V. The voltage may also be determined from the following equation: V = -(first LO Frequency -2.95 GHz) x 2.654 V/GHz 51. The voltage at A14U330 pin 2 should measure -3.
Unlocked Fractional N PLL Operation The fractional N oscillator is used in the HP 85633 as a reference for the first LO phase locked loop. It provides the 1 Hz start-frequency resolution for the first LO, and is the means by which the first LO is swept in LO spans of 2 MHz or less (fractional N spans).
Table 1 l-10. Postscaler Divide Numbers Divide Number 7 6 5 Dll DlO I 0 1 1 D9 Input Range (MHz) (A14J304) output Range (MHz) (A14TP4) 840 to 973 834 to 987.96 823.2 to 960 60.0 to 69.5 69.5 to 82.33 82.33 to 96.0 -7 If the output frequency is wrong by less than 1 MHz, the phase locked loop is not unlocked but still requires repair.
Table 1 I-1 1. Unlocked Fractional N Troubleshooting Areas Measured VCO Frequency Relative to Expected Value Measured > expected Measured < expected Measured, not oscillating Below -4 V VCO clamp VCO clamp VCO clamp Tune Voltage *“..:‘” vco Divider or integrator vco Divider or integrator Divider or integrator vco About +ll V Above +12.
TUNES -2V TO +lOV FOR 813 TO 1000 MHz 0 AT VOLTAGE-CONTROLLED OSCILLATOR - - INSIDE INNER SHEILO WALL - - - - - - - - - - - - - - - - - - - - - I +15”FN L +1.
Table 11-12. Divider and Integrator Troubleshooting Measured VCO Frequency Relative to Expected Value Measured > expected Measured < expected TP6 Frequency zero <2.5 MHz 2.5 MHz >2.5 MHz Dividers Dividers Dividers Det or integrator Both Det or integrator Dividers Dividers 10.
Frequency Span Accuracy Problems The spectrum analyzer employs lock-and-roll tuning to sweep the first LO for spans greater than 2.0 MHz. The first LO is locked to the start frequency immediately after the previous sweep has been completed. The first LO is then unlocked, and, when a trigger signal is detected, the first LO sweeps (rolls).
3. Use the following equation to determine the first LO span used. First LO Span = Display Span Setting Current Band Harmonic Mixing Number 4. Refer to Table 11-13 to determine the circuit associated with the span. Confirming Span Problems 1. If all first LO spans or only first LO spans of 2.
YTO Main Coil Span Problems (LO Spans >20 MHz) For YTO main coil spans, the YTO is locked at the beginning of the sweep and the sweep ramp is summed into the main coil tune driver. 1. Perform the YTO adjustment procedure in Chapter 2, “Adjustment Procedures.
7. Set the spectrum analyzer to the following settings: Center frequency ............................................. ..300MH z Span ............................................................. OHz Trigger ...........................................
First LO Span Problems (All Spans) 1. Set the spectrum analyzer to the following settings: Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..300MHz Span . . . . . . . . . . . . . . . . . . . . .
16. Use a DVM to monitor the voltage at A14J18 pin 4. The voltage should measure approximately -8.45 Vdc. 17. Set the spectrum analyzer sweep time to 100 ms. The voltage at J18 pin 4 should measure approximately -4.21 Vdc. 18. Set the spectrum analyzer sweep time to 200 ms.
...... ..i. / ... .... j. ...... ..i. ::::::I&:::: :::~ + i i ~.~.~.~.j.~.,.~.~./.~.~.~.,.~.~.,.,.~.~.,.,.,.,~,.,.,.,.~.,.,.,.,.i.,.,.,.,.i.,.,.,.,.i.,.,.,.,, i ....... i /( ....... i. ...... ..i. . . . . . ..i.........I.........~........~........
Phase Noise Problems System phase noise can be a result of noise generated in many different areas of the spectrum analyzer. When the spectrum analyzer is functioning correctly, the noise can be observed as a function of the distance away (the offset) from the carrier frequency.
Fractional N versus Offset PLL or YTO PLL Phase Noise If the spectrum analyzer has excessive noise at >l kHz offset, measure the noise with center frequencies of 100 MHz and 2.5 GHz. If the measurements are equal, suspect the fractional N circuitry and the YTO loop circuitry on the Al4 frequency control assembly.
Sampler and Sampler IF The A15UlOO sampler creates and mixes harmonics of the sampling oscillator with the first LO. The resulting sampler IF (60 MHz to 96 MHz) is used to phase-lock the YTO. The sampler IF filters unwanted products from the output of A15UlOO and amplifies the IF to a level sufficient to drive the YTO loop.
10. Set a microwave source to the following settings: Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2107GHz Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The HSCAN signal uses Q2 to reset the ramp. Q2 shorts the integrator and sets its output nominally to ground. --------m--- I Al4 FREQUENCY ,CONTROL ASSEMBLY 1 All YTO I FRAC N + L PLL ----- J301 sll21.
J501 SAMPLER IF FROM Al5 -10 TO +5 d&n t r”~“~“-“---~--~- ------m---a --------7 jP/O Al4 FREQUENCY CONTROL 1 1 YTO LOOP i I I I I f I I I I I I t I I I POSTSCALER l-+ J304 FRAC N TEST -10 dBm L J GENERATOR 1406.6 TO 500 MHz I 800 TO 1020 MHz I +16.
4- A15JlOl SAMPLER IF TO Al4 -10 TO +5 d& W34 1ST LO SAMP i FROM A7 SLODA J501 CAL OUTPUT TO FRONT PANEL TO SIG ID OSCILLATOR > -9 dhl -------mt--- -10 d&n m--m--m-- -----------1 ;P/O Al5 RF i TTL LEVELS I OSCILLATOR CALIBRATOR AGC AMP SRD LO DRIVER MIXER TP40 1 2 TO -6 d&r 20 MHz OFFSET PLL 5,lD.
A21 OCXO The spectrum analyzer uses an oven-controlled crystal oscillator (OCXO). It is deleted in Option 103 and replaced by a temperature-compensated crystal oscillator (TCXO), located on the Al5 RF assembly. Connectors J305 and J306 on the Al5 RF assembly are located where the TCXO would be installed in an Option 103.
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12 RF Section The RF Section converts the input signal to a 10.7 MHz IF (Intermediate Frequency). See the detailed block diagram, Figure 12-8. Note The block diagrams for the Al4 and Al5 assemblies are located in Chapter 11, “Synthesizer Section.
Caution Use of an active probe, such as an HP 85024A, with another spectrum analyzer is recommended for troubleshooting the RF circuitry. If an HP 1120A Active Probe is being used with a spectrum anal.
Table 12-1. Automatic Fault Isolation References Suspected Circuit Indicated by Automatic Fault Isolation Check 2nd IF Amplifier Check 2nd IF Distribution Check 10.
Table 12-2. TAM Tests versus Test Connectors Connector Manual Probe Troubleshooting Test Measured Signal Lines A14J16 YTF Offset DAC MS6 YTF Gain and Offset Input MS2 YTF Gain DAC MS1 YTF Drive MS3 Ba.
5. If the LO feedthrough amplitude is higher than -5 dBm (signal will be “clipped” at top of screen) and signals are low in amplitude, suspect a defective A8 mixer assembly. 6. Perform the steps located in “Control Latch for Band-Switch Driver” in this chapter.
10. Check Third Converter as follows: a. On the HP 85623, press (PRESET) and set the controls as follows: Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..300MHz Span . . . . . . . . . . . . . . . .
9. The measured voltage should be approximately +5 Vdc. If the voltage is not i-5 Vdc, troubleshoot the Al4 frequency control assembly. 10. Connect the positive lead of a DVM to A14J18 pin 15. The voltage should measure within f10 mV of the Gate Bias voltage listed on the A7 label.
A9 Input Attenuator 1. Perform the “Input Attenuator Switching Uncertainty” performance test in Chapter 2, “Using Performance Tests,” of the HP 8560 E-Series Spectrum Analyzer Calibration Guide. 2. If there is a step-to-step error of approximately 10 dB or more, continue with step 3.
Note The logic levels listed in Table 12-3 show the default ac usage (pin 5 low, pin 6 high). D C usage (pin 5 high, pin6 low) is not shown. Table 12-3.
a. Set the spectrum analyzer (LINE) switch OFF, disconnect W13 from A14J12, and set the luNE) switch ON. b. Wait for the power-on sequence to finish and then set the spectrum analyzer settings to the following: Center frequency . . . . . . . . . . . .
Al4 Frequency Control Assembly Note The block diagrams for the Al4 and Al5 assemblies are located in Chapter 11, “Synthesizer Section.” LODA Drive Refer to function block Z on the Al4 Frequency Control Schematic Diagram (sheet 3 of 5) in the HP 8560 E-Series Spectrum Analyzer Component Level Information.
!A7 1ST LO DISTRIBUTION ! All YTO ~AMPLIFIER J41 J3 I J2 F SAMPLER OUT -9 TO -2 dBn HI BAND +13 TO f16 d&n: J5 I LO BAND +13 TO +16 d&n* I 1ST LO OUT 14.5 TO 18.5 d&n (A7J3 FOR HP 8561E) AS V INCREASES - A7 OUTPUT INCREASES I ONLY ONE IST MIXER OUT (A7J2) FOR HP 8561E.
YTF Driver Circuit The YTF driver circuitry consists of the Sweep + Tune Multiplier, FAV (Frequency Analog Voltage) Generator, YTF Gain and Offset, and YTF Drive. Refer to function blocks Q, R, S, and T on Al4 Frequency Control Schematic Diagram (sheet 3 of 5).
1 l.OOV .&7 -3oog lOOZ/ fE RUI Figure 12-4. HP 8582E Rear-Panel LO SWP Output ...... ..i .......... ...... ..j ....... .j ,.,.,.,.~.,., . .,.i 4 ........ . ......... . ...... ..i .. ...... . . “...--.a i JjuJ ..-.a . . . . . . . . . . .,.I.,. . .
Table 12-4. Sweep + Tune Multiplier Values Nt Center A14J15 Pin 3 U416A U416B U416C Gain* Frequency P dc) 1 5 GHz -1.33 Open Closed Closed x -0.208 2 10 GHz -2.58 Open Closed Open x -0.417 * Measured from A14J15 pin 1 to A14J15 pin 3. t N is the harmonic mixing mode.
Al5 RF Assembly Note The block diagrams for the Al4 and Al5 assemblies are located in Chapter 11, “Synthesizer Section.” Confirming a Faulty Third Converter 1. Perform the “IF Input Amplitude Accuracy” performance test in the HP 8560 E-Series Spectrum Analyzer Calibration Guide.
Third Converter Refer to function blocks A, B, C, D, and E on Al5 RF Section Schematic Diagram (sheet 4 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The 3rd converter consists of the 2nd IF distribution, 2nd IF amplifier, double balanced mixer, 10.
9. On the HP 85623, press (-1, ICAL), IF BDJ OFF, M#m I OF 2, and FLA’F#ESS . Increase the gain of the flatness compensation amplifiers to maximum by entering 0 using the data keys. This sets the gains in the flatness compensation amplifiers to their maximum values.
2. On the HP 85623, press (nCTRL) and EXTENNfi MIXER. The voltage on the DVM should measure approximately i-5 Vdc (TTL high). 3. On the HP 85623, press [SCTRL) and INTENNa MIXER. The voltage on the DVM should measure approximately 0 Vdc (TTL low). 4. Connect the positive lead of a DVM to A15J901 pin 13 (LSID).
4. With the SIG ID Oscillator on, measure the frequency at A15X602 with a frequency counter and an active probe. 5. On the HP 85623, press (m) until A15J901 pin 13 is at TTL low. Diodes CR603 and CR605 should be forward biased and CR604 should be reverse biased (approximately 6 Vdc reverse bias).
b. Check U305 pin 3 for approximately +12 Vdc (Option 103 only). c. Check for a 10 MHz sine wave greater than or equal to 1 V p-p at J305 (standard HP 85623), or at U302 pin 3 with an oscilloscope (Option 103).
hp stopped ~~~~~” . . . . . . . . . . . . . . . . . . . . . ~~~ 10iMHz TtL Ref'et-enci at L1.504 Pin 13 i 1.00 V/div ioffset: 2,000 V 1 o, o. :l dc i..... p... . . i ..i., : ;. . . !.... f.... i . . . . . . ;. I...... I.. . . . . . . . ..I.. i.
Table 12-5 lists the RF Section mnemonics shown in Figure 12-8, and provides a brief description of each. Table 12-5. RF Section Mnemonic Table Mnemonic Description TUNE+, TUNE- YTF Tune Signal (SYTF .
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13 D.isplay/Power Supply Section The display/power supply section contains the A6 power supply, A6Al HV module, Al7 CRT driver, and Al8 CRT. Figure 13-1 illustrates the section block diagram. Table 13-1 lists signal versus pin numbers for power cable Wl.
WHEN TROUBLESHOOTING THE POWER SUPPLY USE AN ISOLATION TRANSFORMER FRONT PANEL LED c5v 1 AlWlDSl @I w3 + W3 FL4 FL4 LINE LINE LINE SW I TCH SW I TCH MODULE MODULE AND CONNECT A6TPlOl TO A6TP301 +15V ,;;.6v: AlWl @ PROBE POWER WI 4 POWER SUPPLY INDICATOR LEDS 42 :ONTROLLER -12.
Table 13-l. Wl Power-Cable Connections A3Jl :pins) Signal A2Jl :pins) NC NC A GND -5 v 47 -5 v 46 A GND NC NC A GND SCAN RAMP 41 NC A GND -12.6 V 38 -15 v A GND -15 v +15 v A GND t15 v f28 v t28 v PWR.
Table 13-1. Wl Power-Cable Connections (continued) Signal A2Jl A3Jl A4Jl A5Jl A6Jl A14Jl A15Jl (Pin.9 (pins) (PW (Pms) (Pins) (Pins) (Pms) +5 v 12 39 - - 39* - - +5 v 11 40 - - 40* - - +5 v 10 41 - - .
A17 CRT DRIVER I I’ J4 (RE VISION CONNECTOR) Figure 13-2. Al7 Test Connector Table 13-3. TAM Tests versus Test Connectors Manual Probe Troubleshooting Test Measured Signal Line! Revision MS5 Constan.
2. All of the power-supply indicator LEDs along the edge of the A2 controller assembly should be lit. 3. The rear-panel CRT +llO VDC ON indicator should also be lit. 4. Connect the TAM probe cable to A2Jll. 5. Press (m), SOFT KEY t3, a, SOFT KEY #I. (The top soft key is #l.
5. If all of the power supply indicators along the outside edge of the A2 controller assembly are lit, the A6 power supply is probably working properly. I FRONT VIEW I I I ; +15v -12.6V; I I -----------------~ SK1122 Figure 13-3. Probe Power Socket 6.
6. TTL-level pulses should be observed. If the signal is either always high or always low, the display will be blanked; suspect the A2 controller assembly. 7. If the signals on A2J202 pins 3, 14, and 15 are correct, troubleshoot the Al7 CRT driver. Display Distortion The HP 85623 spectrum analyzer uses a vector display.
12. If signals are correct and cables to CRT are good, suspect the CRT. Focus Problems Focus problems may be due to a defective A18Vl CRT, the Al7 CRT driver (especially the grid level shifter section), or the A2 controller focus-control circuitry.
13. Verify that the front-panel intensity adjustment when used with the A17R21 Z FOCUS changes the peak-to-peak voltage at TP9 by 25 V. Access the intensity adjustment by pressing (DISPLAY), IEJmS3TY and turning the front panel knob. 14. Set the front-panel intensity to minimum.
Note The following measurements should be made with a high-voltage probe, such as the HP 34111A. When using the high-voltage probe, connect the ground lead securely to the spectrum analyzer chassis. 7. Carefully measure the grid voltage at A17J7 pin 6, and the cathode voltage at A17J7 pin 4.
A6 Power Supply Assembly Troubleshooting The spectrum analyzer uses a switching power supply operating at 40 kHz to supply the low voltages for most of the analyzer hardware, and a 30 kHz switching supply (CRT supply) to provide the high voltages for the CRT display.
Kick-start/Bias 1. Measure the voltage at TP108 to verify the output of the input rectifier. The voltage should be between t215 Vdc and +350 Vdc. 2. If it is not within this range, check the rear panel fuse, input rectifier, input filter, and the rear-panel line voltage selector switch.
Line Fuse Blowing 1. If the line fuse blows with the (LINE) switch off, suspect either the input filter or the power switch cable assembly. 2. If the line fuse blows when the spectrum analyzer is turned on, disconnect the power cord and lift the drain of A6Q102 from TP108.
Low Voltage Supplies 1. Connect the negative lead of the DVM to A6TP301 and verify the power supply voltages. a. Check A6TP302 for +15 Vdc. b. Check A6TP303 for -15 Vdc. c. Check A6TP304 for +28 Vdc. d. Check A6TP305 for -12.6 Vdc. e. Check A6TP308 for i-5 Vdc.
Note Ideally, the DVM should read the voltage written on the label of the A6Al HV module. If necessary, perform the “High Voltage Power Supply” adjustment in Chapter 2, “Adjustment Procedures.” 5. If the DVM does not read approximately +llO Vdc, measure the voltage on A6U401 pin 10.
7. If the sawtooth is correct, check the base of Q401 for 30 kHz pulses. 8. If the duty cycle is high, but there is no i-110 Vdc, suspect the bridge rectifier, CR401 through CR404. Buck Regulator Control See function block H of A6 power supply schematic diagram in the component-level information binder.
Power Up See function block D of the A6A2 regulator schematic diagram in the component-level information. The power up circuitry generates the PWR UP signal, which tells the microprocessor that the supplies are up and stable. PWR UP will go high when the +5 Vdc supply exceeds t4.
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Component-Level Information Packets Component-Level information is available for selected instrument assemblies. The information for each repairable assembly is provided in the form of Component-Level Information Packets (CLIP S ). Each CLIP contains a parts list, component-location diagram, and schematic diagram.
Table A-l. HP 8562 Spectrum Analyzer Documented Assemblies Board Assembly Instrument Assembly CLIP Part Number Serial Prefix Part Number AlAl Keyboard 3611A and above 08562-60140 08562-90188* A2 Contr.
Table A-l. HP 8582 Spectrum Analyzer Documented Assemblies (continued) Board Assembly Al5 RF Board (Option 103) (without SIG ID) Al5 RF Board (Standard) (with SIG ID) Al5 RF Board (Standard) (without .
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Index 1 100 MHz oscillator, 11-16 10.6952 MHz VCXO troubleshooting, 9-18 10.7 MHz and 4.8 kHz IF filter troubleshooting, 9-18 10.7 MHz IF filter troubleshooting, 9-17 10 kHz and 3 kHz resolution bandw.
demodulator adjustment, 2-53 display, 2-15 external mixer amplitude adjustment, 2-57 external mixer bias adjustment, 2-56 First LO distribution amplifier, 2-40 frequency response adjustment, 2-43 high.
test menu, 3-12 verify HP-IB, 3-12 controller block diagram, lo-17 check, 7-14 frequency response adjustment software, 3-2 section, 7-50 converter second, 7-44, 12-9 third, 7-45 cover assembly parts, .
comparator, 8-31 control registers, 8-31 control word, 8-31 counter, 8-31 CPU, 8-31 post-trigger counter, 8-31 reference check, 8-31 reference generator, 8-31 trigger, 8-31 video trigger, 8-31 fan rem.
I IF adjustment, automatic , 9-10 IF amplifier, 7-44 IF amplitude adjustments, 2-26 IF assembly, 7-49 IF assembly troubleshooting, 9-9, 9-21 IF bandpass adjustment, 2-21 IF filter, 4.8 kHz and 10.7 MHz problems, 9-18 IF filter troubleshooting, 10.7 MHz , 9-17 IF filter troubleshooting, 4.
mixer/detector log amplifier troubleshooting, 9-20 N noise. See phase noise 0 ocxo, 1 l-50 OCXO adjustment, 2-48 OCXO removal and replacement, 4-56 offset lock loop, 7-47, 11-20. See also sampler offset PLL phase noise, 11-44 operation verification mass storage file, 3-8 option 908, 5-7 option 909, 5-7 options.
RF (A15) assembly replacement, 4-38 RF assembly troubleshooting, 12-16 RF block diagram, 11-49 RF check, 7-15 RF gain DACs, 8-13 RF parts, 5-18 RF path fault isolation, 7-16 RF section, 7-43 RF sectio.
tools adjustment , 2-3 tools required, 4-3 trace storage problems, lo-15 triggering, 7-50 triggering problems, 8-9 troubleshooting instrument, 7-8 U unlocked PLL, 11-15 user generated error messages, 7-41 v vco, 11-33 VCO bias voltages, 11-34 VCXO troubleshooting, 10.
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