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  5. Instructions For Assembly And Operation Manual

Hafler DH-500 Instructions For Assembly And Operation Manual

Manual is about: Hafler Amplifier User's Guide DH-500

Summary of DH-500

  • Page 1

    The power ampli fier for assembly and operation caution: if the fuses blow, some distorted sound can be heard. Therefore if amplifier malfunctions, always check for blown fuses first. Lm153 $3.00 the david hafler company 5910 crescent boulevard, pennsauken, new jersey 08109 please refer to this seri...

  • Page 2

    Power rating: less than 0.025% total harmonic distortion at any power level up to 255 watts continuous average power per channel into 8 ohms at any frequency between 20 hz and 20 khz with both channels driven. Im distortion (smpte): less than 0.007% from 1 watt to 255 watts into 8 ohms typical thd a...

  • Page 3

    Introduction the hafler dh-500 is a two channel audio power amplifier designed to the very highest performance stan- dards. It is available as a kit, or factory assembled. Its power rating of 255 watts per channel is very conservative, and it can deliver appreciably higher powers into impe- dances b...

  • Page 4

    Installation the dh-500 may be installed out of sight in many appli- cations, where its power can be controlled by the ac switching of a preamplifier control unit. However, any high power amplifier may draw enormous amounts of cur- rent, so you should make sure your preamplifier has the switching ca...

  • Page 5

    If the manufacturer of your speakers recommends a specific fuse value for their protection, you should obtain 3ag type fuses of that value and substitute them for the ones supplied. The speaker fuses are included in the amplifier design solely for speaker protection. They do not protect, or affect, ...

  • Page 6

    Number of specialty speaker cables preferred by perfec- tionists. If you have 4 ohm speakers, larger wire is recom- mended than for the typical 8 ohm speakers, too. The black output terminals are connected to ground in- ternally. The black terminals may be connected together (common ground) when in ...

  • Page 7

    4. Allow the connection to cool undisturbed. Remember that the connection is made by the solder, not by mechanically attaching the wire to the terminal. Usually the wire is looped through the lug and crimped in place, but some prefer to just place it through the hole and rely on the stiffness of the...

  • Page 8

    Mechanical assembly 1 for security in shipping, the power transformer and the amplifier module have been fastened to the chassis. Remove the chassis cover, the inner front panel and the larger front plate, and set these aside. Be particularly careful in handling the amplifier module. To see that the...

  • Page 9

    10 11 12 s e l e c t the plastic encased relay, the longer l-shaped mounting bracket, and 2 sets of hard- ware. Insert the screws through the bracket with the bracket foot pointing away from the lugs at the opposite end of the relay. ‘lighten this hardware se- curely, but do not risk breaking the pl...

  • Page 10

    There are two gauges of wire supplied with the kit. For while excessive heat or careless “scrubbing” with the iron connections which pass substantial current, the heavier can lift the circuit foil from the board, more people tend to wire is used. Other connections need only the lighter gauge use ins...

  • Page 11

    40 prepare two 9” white wires. Connect one to eyelet 52 q select the spade lug and connect it to the free end of #8 of the left board. (s). Connect the other to the white wire from lt lug 6. Place this wire to the eyelet #6. (s). Bend these toward the bottom, and left, and twist it lightly together ...

  • Page 12

    62 prepare a 3” white wire. Connect one end to ry lug #4. (s). Connect the other end to red output termi- nal lr. (s). 63 prepare another 3” white wire. Connect one end to ry lug #6. (s). Connect the other end to output terminal rr. (s). 64 prepare a 16”green wire. Connect one end to black output te...

  • Page 13

    80 0 select the triad of black, red and yellow wires from under the module. These will be connected to the right end of the terminal strip, and to prevent the heat from the large resistors from melting the insu- lation on the wires, connect the wires from behind the terminal strip and keep them agai...

  • Page 14

    97 select the .Ol mfd disc capacitor and trim each lead to 3/4". Strip two 1/2" lengths of insulation from a piece of heavy wire, and install these on the capacitor leads. Connect one lead to db lug #l. (s-3). Connect the other lead to db lug #4. (s-2). 98 select the power switch and the .Oo5 mfd di...

  • Page 15

    Circuit description the dh-500 amplifier components have been selected to pro- tect against failure, and all parts are operated conservatively to assure unaltered performance and proper operation for many years. The semiconductors have been thoroughly researched and selected for minimum noise and di...

  • Page 17

    All resistors are watt 5% carbon film unless otherwise noted. Rl r2 r3 r4 r6 r7 r8 r9 r16 r20 r22 r23 r24 r25 r26 r27 r28 r29 r30 r31 r32 r33 r34 r36 r37 r38 r102 r104 r106 r107 rl r l l l 12 rl15 rl17 ri20 r401 r402 r403 r405 r406 r408 r409 f40 f402 1 ll p2 t40 1 t402 ry40 1 470,000 ohms 1,800 ohms...

  • Page 18: 100V.

    Ac line connections for overseas use the power transformer supplied in dh-500 amplifiers sold in multi-voltage transformer is installed. This, the 600 o h m the usa is intended for 120 volt, 60 hz operation only. For use resistors, the mounting hardware, and the alternate line fuse are in other coun...

  • Page 19

    Kit parts list small parts envelope minor variations may sometimes be encountered in value or appear- ance. These will not affect performance. Some of the hardware listed here has been used to secure parts for shipping the kit. 2 1 1 bracket, l-shape, 2” bracket, l-shape, 3” capacitor, 0.005 mfd dis...

  • Page 20

    Dh-502 installation instructions 1. 2. 3. 4. 5. 6. 7. 8. Disconnect ac power from the dh-500 and remove all connect- ing cables. Remove the 17 screws which secure the cover along the top front, sides and rear. Set cover aside. Do not grab the ampli- fier panel or handles when the cover is re- moved....

  • Page 21: Instructions For

    Instructions for the hafler dh-502 amplifier bridging kit for the dh-500 the dh-502 amplifier bridging kit for the dh-500 consists of a pc-7a circuit board comprising a 6 transistor phase inverting amplifler, a mounting bracket, necessary hardwareandconnecting wire. Installation may take about an ho...

  • Page 23

    The dh-500 power amplifier has been carefully en- gineered to provide many years of use without requiring any maintenance or servicing. Factory assembled units are subjected to many physical and electrical tests before shipment. The amplifier module assemblies of kit units are similarly tested to me...