Gebruiksaanwijzing /service van het product DH-200 van de fabrikant Hafler
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THE POWE R AMPLIFIER INSTRUCTIONS for OPERATION and KIT ASSEMBLY CAUTION: IF THE SPEAKER FUSES BLOW, SOME DISTORTED SOUND CAN BE HEARD. THEREFORE IF AMPLIFIER MALFUNCTIONS, ALWAYS CHECK FOR BLOWN FUSES FIRST.
INTRODUCTION The Hafler DH-220 is a two channel audio power amplifier designed to the very highest performance standards. It is available either as a kit, or fully assembled. Its 115 watt per channel power rating is sufficient for driving all loudspeakers in home applications, and its design assures extremely low distor- tion of all types.
INSTALLATION Th e DH-22 0 is most likely to be installed out of sight in most applications, since its power may be controlled by the AC switching of most audio preamplifiers, like the Hafler DH-110.
performance. Special low capacitance cables enable even greater distance between preamp and amplifier. It is desirable to keep the left and right input cables close together throughout their length to minimize the likelihood of hum pickup. Also, you should avoid running them parallel to AC cord s - these should be crossed at right angles.
A soldering “ gun ” is not recommended. The unfamiliar user is more likely to damage the etched circuit boards with its higher heat potential and unbalanced weight. Also, because he may not wait long enough for it to reach operating temperature each time it is switched on, poor solder connections are more likely.
Wiring the Kit If any components are unfamiliar to you, checking the pic- torial diagram should quickly identify them. Or, the quantities, and the process of elimination as you check the parts list, will help.
5 n Select the two round fuse holders, and two each 1/2” rub- ber washers, lockwashers and nuts. First install the rub- ber washer on the holder, so it will be outside the chassis, and then fasten the fuse holders at LF and RF, with the tip lugs pointing towards each other, toward the center of the chassis.
19 c3 Prepare a 7 ” green wire. Connect one end to terminal LB. (S-2). Place this wire towards the center of the chassis. 20 Ll Prepare a 10 ” white wire and a 10 ” green wire. Starting with the white wir e 3/4" longer, twist them together.
The transformer leads may be trimmed as desired for a neat job, but be sure you do not cut any of them too short (particularly if yours is the multi-voltage version, and any change to a different supply voltage is likely). Cutting the leads too short for re-use may void its warranty, if it is thought to be defective.
55 I 56 [ 57 : 58 : 59 I 60 : 61 1 62 ! 63 I 64 : Select the white pair of wires at the front of the chassis. Tuc k the excess-wire into the corner and connect one wire to each of the lugs on the thermal breaker.
Bias Remove th e B + fus e F2. Thi s fuse is in the line from th e ’ + ’ capacito r terminal to hol e #3 on the board. Connect an ammeter ’ s ' + ' !ead to the fuse clip nearest the large filter capacitors. Connect the ’ - ’ lead to the other side of the fuse clip.
The power transformer supplied i n DH-220 amplifiers sold in th e lJSA is intended for 120 volt, 60 Hz operation only. For use in other countries, a multi-voltage transformer is available at higher cost.
KI T PARTS LIST Minor variations may sometimes be encountered in value or appearance. These will not affect performance. Part No. Fuse Envelope 6 Fuse, 5 ampere 2 Fuse, 2 ampere 1 Fuse, 7 ampere, Slo-Blo 1 Additional fuse, 4 ampere, Slo-Blo (International use only) 1 1 2 2 1 4 2 1 2 2 1 2 2 2 1 1 1 1 1 1 1 1 1 Chassis Cover Capacitor .
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COMPONENT VALUES All resistors ar e l/4 w carbon fil m unless specified otherwise Rl 470,000 ohms R2 1,800 ohms R3 47,000 ohms R4 47,000 ohms R5 1,000 ohms R6 1,000 ohms R7 47,000 ohms R8 560 ohms R9 .
SPECIFICATIONS Power Rating: Les s than 0.02% total harmonic distortion at any power level up to 115 watts continuous average power per channel into 8 ohms at any frequency between 20 Hz and 20 kHz with both channels driven. Input Impedance: 47,OOO ohms.
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INSTRUCTIONS FOR THE HAFLER DH-222 AMPLIFIER BRIDGING KIT FOR THE DH-220 The DH-222 may be installed in a Hafler DH-220 power amplifier to enable easy conversion to a high power monophonic amplifier, bridging the two conventional chan- nels to a single floating output which can deliver in excess of 400 watts into an 8 ohm load.
DH-222 INST ALLATIO N INSTRUCTIONS 10 2cl 30 40 50 60 70 80 Disconnect AC power from the amplifier, and remove all con- necting cables. Wait 5 minutes to allow capacitors to discharge before proceeding with disassembly.
Een belangrijk punt na aankoop van elk apparaat Hafler DH-200 (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 Hafler DH-200 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 Hafler DH-200 vinden. Op dit manier kan je controleren of het apparaat aan jouw behoeften voldoet. Op de volgende pagina's van de handleiding Hafler DH-200 leer je over alle kenmerken van het product en krijg je informatie over de werking. De informatie die je over Hafler DH-200 krijgt, zal je zeker helpen om een besluit over de aankoop te nemen.
In een situatie waarin je al een beziter van Hafler DH-200 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 Hafler DH-200 kunnen verkorten.
Maar de belangrijkste taak van de handleiding is om de gebruiker bij het oplossen van problemen te helpen met Hafler DH-200 . 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.
