Manuel d'utilisation / d'entretien du produit DH-200 du fabricant 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.
Un point important après l'achat de l'appareil (ou même avant l'achat) est de lire le manuel d'utilisation. Nous devons le faire pour quelques raisons simples:
Si vous n'avez pas encore acheté Hafler DH-200 c'est un bon moment pour vous familiariser avec les données de base sur le produit. Consulter d'abord les pages initiales du manuel d'utilisation, que vous trouverez ci-dessus. Vous devriez y trouver les données techniques les plus importants du Hafler DH-200 - de cette manière, vous pouvez vérifier si l'équipement répond à vos besoins. Explorant les pages suivantes du manuel d'utilisation Hafler DH-200, vous apprendrez toutes les caractéristiques du produit et des informations sur son fonctionnement. Les informations sur le Hafler DH-200 va certainement vous aider à prendre une décision concernant l'achat.
Dans une situation où vous avez déjà le Hafler DH-200, mais vous avez pas encore lu le manuel d'utilisation, vous devez le faire pour les raisons décrites ci-dessus,. Vous saurez alors si vous avez correctement utilisé les fonctions disponibles, et si vous avez commis des erreurs qui peuvent réduire la durée de vie du Hafler DH-200.
Cependant, l'un des rôles les plus importants pour l'utilisateur joués par les manuels d'utilisateur est d'aider à résoudre les problèmes concernant le Hafler DH-200. Presque toujours, vous y trouverez Troubleshooting, soit les pannes et les défaillances les plus fréquentes de l'apparei Hafler DH-200 ainsi que les instructions sur la façon de les résoudre. Même si vous ne parvenez pas à résoudre le problème, le manuel d‘utilisation va vous montrer le chemin d'une nouvelle procédure – le contact avec le centre de service à la clientèle ou le service le plus proche.
