Gebruiksaanwijzing /service van het product SX70 van de fabrikant Polaroid
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I - DESCRIPTION The Polaroid Land SX-70 is a folding, pocket sized, single-lens reex camera which takes and immediately delivers full-color pictures approximately 31/4 inches square (see gures 1-1, 1-2 and 1-3). Operation is automatic; the user merely inserts the lm, focuses and shoots.
The subject is viewed and focused throught the taking lens, a mirror , a Fresnel viewing screen (with spilt-image focusing aid) and a optical system to focus the image at the viewing eye- piece. As in all single-lens reex cameras, the shutter must be open to provide an image at the eye-piece.
When the camera is fully opened, the interlock switch (S6), located at the left rear corner of the mirror cover , is closed and the battery is connected to the camera electrical circuit. (Figure 1-4). The front coverlatchis located on the right side of the camera just inside the rim of the bottom cover assembly .
Thus, the cover must be fulled closed, the gears engaged, and the latch fully seated, in order to actuate the drive motor . As S7 closes, power is applied to the drive motor (S8 is also involved and is discussed in a following paragraph), the gear train is set in motion and actuates a device called the lm pick.
shutter to initiate a series of events. The shutter blades close to cut off the optical path. The hinged Fresnel viewing screen is swung upward and comes to rest in front of the xed viewing mirror (Figure 1-8 B). The shutter opens and closes to perform the exposure function.
slide. The counter will start at number 10. Since switches S8 and S9 are physically attached to the counter , the camera will cycle through 10 exposures even though there be less than 10 sheets of lm in the pack. This deviation must be recognized whenever a partially exposed pack is used.
When through using camera it be can folded and latched in its closed conguration by pushing the erecting link. When the camera is closed, the interlock switch (S6) is opened so that the battery is completely disconnect from the camera circuits.
When the release button is pressed, a switch S1 closes (Figure 1-1 1 A and B) and applies operating power to the shutter . As soon as power is applied to the shutter , solenoid #1 is energized and rapidly moves the shutter blades to the closed position.
to an adequate level to hold the solenoid after the high-current circuit has completed the solenoid operating function and switches on the motor drive circuit. Thus, the shutter will remain closed, with minimum battery drain. Light entering the lens is now cut off and the reex mirror is swung upward to picture-taking position.
mechanical device identied as the interceptor connected to the lens focusing mecchanism (Figure 1-13 A). the interceptor is moved as the lens is focused regardless of whether ambient-light or ash pictures are being taken.
Figure 1-14 S5 being opened by the recock ram (Gear train) Figure 1-13 B Interceptor link, Solenoid 2, S2 operation - Solenoid energized.
In cameras with «P» conguration or later shutter there is no ambient light measurement made. If a ash bar is in the shutter socket a ash picture will result regardless of the ambient light level. On early cameras, an ambient light measurement is made during the ash delay period.
II - THEOR Y OF OPERA TION A general description of the camera and the sequence of its functions is contained in Section I. In that section, detailed analysis of individual assemblies and electrical circuits was minimized so that emphasis could be placed on the intenelation-ship of various functions.
the subject passes through the camera lens and is reected by the viewing mirror (on the inside surface of the mirror cover) to the Fresnel viewing screen. The entire subject image is now reproduced on the viewing screen. At this point, viewnder optics must be employed for focusing.
The screen itself is a sheet of plastic upon which are impressed series of concentric rings much like the grooves pressed into a phonograph record (Figure 2-3) instead of having a vee shaping; however.
mirror , the 6-edges viewing mirror is used in the optical path twice. First, the light rays entering the camera from the taking lens are reected onto the Fresnel screen by the viewing mirror . Secondly , the operator views the image on the screen with light reecting off the viewing mirror (Figure 2-1).
The entire ECM (rather tna its individual integrated circuits) is used as a remplacement item. For that reason, the theory of operation and analysis techniques presented in this manual have prepared in such a way that the repairman can relate a specic camera failure mode to an ECM function.
Figure 2-7 S3 Being opened by recock ram c- Switch S3, normally closed at the begining of the exposure cycle is opened by the recock ram located in the gear train assembly .
Figure 2-8 S4 Switch operating congurations damage to the circuit in the event that ashbulb becomes short-circuited after it is red. e- Switch S5 (normally closed at the beginning of the exposure cycle), like S3, is located in the gear train and actuated by the recock ram (Figure 2-7).
Figure 2-8 A S8 - S9 Exposure counter switches h- Switch S8 (Figure 2-8 A) is part of the exposure counter operated by the counter wheel. As S7 closes, power is applied, ejecting the dark slide. After the dark slide ejection, the counter wheel turns, opening S8.
mechanical coupling device set the exposure counter to the position just before the rst exposure and closed S8, but since S7 has removed all battery power no action occurs). h- At the end of the 40 millisecond delay period, the ECM removes power from solenoid #1 and the shutter opens.
k- If the operator has removed pressure from exposure button all power will be removed and the shutter blades will open to permit viewing. If the button has not been released, the shutter blades will remain closed until the operator removes his nger from the button.
The following paragraphs describe the manner in which the mechanical components of the shutter respond to either manual or electrical direction. 1. When the operator prepares to take a picture, he rst must aim and focus the camera.
Figure 2-9 A Solenoid S2 operation 2. When an ambeint light exposure is being made, all of the action just described takes place but does not affect the shutter action. However , when a ash array is inserted switch S2 in the ash socket programs the electronics to energize solenoid #2.
Figure 2-10 Spread roller system The basic theory of the lm processing method remains unchanged from previous Polaroid system. That is , the developping chemistry is encapsuled in a pod on each she.
partial pack : the top of the sheet of lm would be ejected as a dark slide and the counter would registrer «10». After the last actual sheet is used, the camera would still function until «0» is reached.
CLOSED BY OPER TOR S4 SWITCHES AC to BC S4 SWITCHES AC to BC CLOSES CLOSES S1 S4 BC S4 BC S4 AC End "Y" S5 S3 S3 S5 ST 2 S1 T - 0 S2 → Closed if flash array inserted Solenoid #2 power up (.
III - TROUBLESHOOTING The Sx-70 camera is an electronically controlled device, the electronics being in the integrated circuits (IC) mounted in the Electronic Control Modul (ECM) and Flash Fire Assembly (FF A) in the shutter housing and in the Motor Control Circuit (MCC) in the camera back.
SX-70 CMAERA REP AIR INSPECTION PROCEDURE A. FUNCTIONAL TEST 1. Perform light leak test. 2. Check focus and trim wheel torque. 3. Check trim wheel reset ±2 teeth and front cover to shutter gap. 4. Cycle camera 3 times at 5.0 and 6.4 volts with power pack.
Figure 3-2 SX-70 Collimator Figure 3-1 Film pack simulator and power suplly Checkout the SX-70 camera requires the use of several pieces of test equipment.
Figure 3-2 T ypical collimation conditions Figure 3-3 Location of new collimator target a. Collimation of the Split Image Viewing System. NOTE : If the collimator is not available, set the focus wheel to innity and look at a scene at least 200 feet away .
Figure 3-5 Disengaging the idler gear (2) Open the camera front cover slide the camera onto the horn of the collimator . Make sure that the camera is all the way on the horn so that the camera is captured by the spring latches. (3) Swing the collimator innity lens to its vertical position.
(8) Look through the camera and observe the vertical line target. Compare the observed image with Figure 3-4 to determine if the camera is within specications. NOTE : There is no separate close-focus adjustement on the camera. if the focus wheel has reached its stop before maximum resolution is achieved, return to the innity check.
b. Ambient mode exposure test (1) Place the S2 switch int he OPEN position. Set the voltage to 5.8 volts (2) Set the light level selector to the desired 100 light level (3) Slide the camera over the horn on the tester . The camera should go through the dark slide (S8) cycle.
more times. The READY and FLASH indicator lamps should sequence as in step 3. (6) On the ash simulator assembly , press and release the RESET button. (7) Press the exposure button actuator . The number one READY indicator lamp should remain lighted and the number one FLASH indicator should not light.
(4) Slide the camera fully onto the horn. (5) Select the light level desired on the Comparalumen and slide the horn up against the appropriate window . (Position the horn so that the locating pad on the front of the horn touches the window .) (6) Insert a remote shutter release cable into the socket on the right side of the shutter .
camera in the mirror up picture taking position). (Both of these tests must be done in a darkened aera.) a. Static tests (1) Erect the camera and remove the front cover assembly . Close S7. (2) T urn on the power supply and insert the light leak xture into the camera lm compartment.
Figure 3-10 Manual camera tester c. Install the ash simulator board into the camera ashbar socket in the same way as a ashbar would be installed . d. Press the red exposure button, S1. e. Observe that LED #1 ashes. f. Flip switch S1 up. g.
MANUAL FUNCTION TEST SEQUENCE T est Mode Action Shutter Response S6/S7 Close S6/S7 Press and release S1 button to check for mechanical binding. Observe current drain. No reaction (Blades open, motor off) AMBIENT Exposure Mode Remove ash array from shutter .
Figure 3-1 1 SX-70 Viewnder system Figure 3-12 Installing the exit pupil gage Viewnder quality refers to the general quality and alignment of the camera optics. For the user , it can be precisely dened as the appearance and clarity of the image as seen through the viewing system (Figure 3-1 1).
Figure 3-14 Exit pupil images Figure 3-13 Aligning the exit pupil gage (3) The mounting rails for the gage must be ush with the eyelens frame. Check by holding the bottom of the eyelens frame with the thumb and apply slight pressure in the upper front of the gage with the right index nger .
Figure 3-15 Identifying distorted mirrors 3. Concave Mirror Distortion Check a. Focus on a target which presents a clear vertical line (for example a door frame). b. Scan the camera horizontally . c. If the mirror is not distorted, the vertical line seen in the eyepiece will vary at the camera is scanned.
Figure 3-16 Fresnel standards chart you to a chart. In all cases, the fault analysis charts present the logical sequence of checks and remedial procedures.
Figure 3-18 Flex circuit terminal locations 1. Camera/Shutter Isolation T o expedite the repair procedure, it is essential that the malfunction be isolated to either the camera back or the shutter as early as possible in the troubleshooting procedure.
Figure 3-19 T est points on SX-70 shutters Figure 3-18 T esting instrument connections d. With the 1000 ohm resistor still in place, connect a jumper wire between the motor (minus TP9 contact) and the battery (minus TP1 contact) for a moment : (1) If the motor runs, the MMC is defective.
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IV - REP AIR AND ADJUSTMENTS This section of the manual is primarily devoted to disassembly/reassembly procedures. These procedures provide step by step instructions aimed at guiding the technician through the intricacies of SX-70 camera repair .
Figure 4-1 Front cover hinge studs Figure 4-2 Comparison of spread roll brackets (4) Close the front cover and recheck; bend further if necessary . (5) With the front cover open, observe for a clearance between the latch and the 3 rd idler gear .
Figure 4-4 Comparison of decal before and after front cover closure Figure 4-3 Bending the stop latch.
Figure 4-5 New spread roll conguration 1. Interference Between Front and Bottom Covers A few cameras may have an interference t between the S7 actuator post and the edge of the bottom cover when the front cover is opened. The problem has been traced to slightly oversize bottom covers.
Figure 4-6 Front cover light shield cam Figure 4-7 Replacing light shield cam When a new type shutter is installed, the cam in the light shield must be inspected and changed if necessary . The new cam should be installed in the same place and manner as the old cam (Figure 4-7).
Figure 4-9 Shutter mount retaining screws 5 . In the following step, the bottom cover will be removed. T o prevent damage to the ex circuit, insert a thin strip (a small, metal, six-inch pocket scale, for example) between ex circuit and the inside cover surface.
Een belangrijk punt na aankoop van elk apparaat Polaroid SX70 (of zelfs voordat je het koopt) is om de handleiding te lezen. Dit moeten wij doen vanwege een paar simpele redenen:
Als u nog geen Polaroid SX70 heb gekocht dan nu is een goed moment om kennis te maken met de basisgegevens van het product. Eerst kijk dan naar de eerste pagina\'s van de handleiding, die je hierboven vindt. Je moet daar de belangrijkste technische gegevens Polaroid SX70 vinden. Op dit manier kan je controleren of het apparaat aan jouw behoeften voldoet. Op de volgende pagina's van de handleiding Polaroid SX70 leer je over alle kenmerken van het product en krijg je informatie over de werking. De informatie die je over Polaroid SX70 krijgt, zal je zeker helpen om een besluit over de aankoop te nemen.
In een situatie waarin je al een beziter van Polaroid SX70 bent, maar toch heb je de instructies niet gelezen, moet je het doen voor de hierboven beschreven redenen. Je zult dan weten of je goed de alle beschikbare functies heb gebruikt, en of je fouten heb gemaakt die het leven van de Polaroid SX70 kunnen verkorten.
Maar de belangrijkste taak van de handleiding is om de gebruiker bij het oplossen van problemen te helpen met Polaroid SX70 . Bijna altijd, zal je daar het vinden Troubleshooting met de meest voorkomende storingen en defecten #MANUAl# samen met de instructies over hun opplosinge. Zelfs als je zelf niet kan om het probleem op te lossen, zal de instructie je de weg wijzen naar verdere andere procedure, bijv. door contact met de klantenservice of het dichtstbijzijnde servicecentrum.
