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5   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.

6   Select the two input sockets and 4 sets of  #4  hardware.

Install the sockets 

inside 

the chassis at LS and RS so that

the short lug of each socket is near the hole between the
two sockets.

7   Select the single ground lug (with lockwasher teeth) and

one set of #4  hardware. Install it between the input
sockets, pointing toward the bottom. Bend it out for ac-
cess, and twist it 90°  for easier insertion of a wire later.
Be sure this lug is 

tight, 

as the locking teeth must cut

through the chassis paint for a good ground connection.

8   Select the four-lug diode block DB, the long  # 6  screw,

and a nut. Install the rectifier in the center hole near the
rear of the chassis, with the plus 

(+)

 terminal located

over the tiny indexing hole at position four. Correct
orientation of this rectifier is 

essential 

for proper wir-

ing.

9   Select the single fuse clip, and one set of #4  hardware. In-

stall the clip in the right front chassis hole FC, closest to
the foot.

10   Select the two dual fuse clips and four sets of  #4 hard-

ware. Install these in the pairs of holes FL and FR on
either side of the center of the chassis.

11 

 Select the  5-lug  terminal strip and two sets of #4  hard-

ware. Install it in the front holes TS, next to the single
fuse clip. Note the position of the mounting lugs (to the
right) in the pictorial diagram.

NOTE: Kits provided with the multiple voltage power transformer
for use in locations outside the United States having a line (mains)
voltage other than 120 VAC are also supplied with an additional two-
lug terminal strip which is to be installed using an additional set of #4
hardware on the other side of the chassis, below the dual fuse clip FL.

12   Select the power switch. Install it with the red window to

your right as viewed from the front. The switch snaps
into chassis hole PS from the outside.

13 

q  

Select the AC line cord and the plastic strain relief.

Separate the two conductors for 2”. Cut 1” off one of the
two leads, and strip 1/4" of insulation from each lead.
Twist the strands tightly, and tin each end. Make a sharp
'V' in the cord 8 1/2" from the longest cut end by bending it
back on itself. Install the relief with the small end nearest
the cut end of the cord. Crimp the two halves of the relief
around the wire at the ' V '  with heavy pliers, to partially
form it before insertion into back panel hole AC. Then
grip the larger diameter with the plier tips, squeeze it
tightly, and insert the cord and the relief from the out-

side. A flat side of the relief mates with the hole shape,
and it snaps into position when fully inserted.

1 4

1 5

1 6

18 

Connect the shorter lead to FC lug #l. (S). Connect the
longer lead to the 

lower 

hole of TS lug #2. (S). Note that

lug 2 is the second protruding lug on the terminal strip. It
is 

not 

the mounting bracket for the terminal strip.

Soldering this lead to the lower hole now will make later
connections to the top portion of the lug easier. Be sure
no stray strands of either line cord conductor are left
unsoldered.

Prepare a 6 1/2" green wire. Connect one end to dual fuse
clip FL lug #l. Connect the other end to the other dual
clip FR lug #l. (S).

Prepare a 6 1/2" white wire, Connect one end to FR lug #3.
Connect the other end to FL lug #3.  (S).

Prepare two 7” white wires. Start with one wire project-
ing 3/4" beyond the other, and twist them uniformly
together throughout their length. Connect the project-
ing end to RF lug #l. (S). Connect the corresponding end

of the other wire to RFlug  #2.  (S). Place this pair over the
right edge of the chassis.

Prepare two more 7” white wires. Start as before with
one wire 3/4" longer, and twist them together. Connect
the longer end to LF lug #2 (S). Connect the other wire to
LF lug #l. (S). Place these wires off to the left.

Prepare an 8” green wire and a 10” white wire. Start
with the white wire 3/4” longer than the green wire, and
twist them uniformly together. Connect one end of the
green wire to the lug on black output terminal LB. Con-
nect the corresponding end of the white wire to red
terminal LR. (S). Place these wires off to the left.

Содержание DH-200

Страница 1: ...SEMBLY CAUTION IF THE SPEAKER FUSES BLOW SOME DISTORTED SOUND CAN BE HEARD THEREFORE IF AMPLIFIER MALFUNCTIONS ALWAYS CHECK FOR BLOWN FUSES FIRST serial number in all communications THE DAVID HAFLER COMPANY 5910 Crescent Boulevard Pennsauken New Jersey 08109 ...

Страница 2: ...e made a better choice The oversized power transformer and bridge rectifier the massive heat sinks the conservative operating levels of the MOSFET output devices all are evidence of the design efforts to achieve exceptional reliability simultaneously with state of the art sonics and specifications And this circuit is convertible to a high power monophonic amplifier with comparable stability and sp...

Страница 3: ...l content such as oscillation Failing evidence of this the amplifier may have malfunctioned Because of the very large heat sinks it is highly unlikely that any normal signal will cause the amplifier to overheat Loudspeaker Fuse Selection The DH 220 power amplifier is supplied with 2 amp fuses in the speaker lines Experience has shown that since an overload must exist for a few seconds for a fuse t...

Страница 4: ...s been internally modified for monophonic bridged operation the output is taken from the two red terminals only Then the black terminals are left unconnected Headphones are normally operated from the loudspeaker outputs but are usually connected through a junction box which provides switching from phones to speakers Such a box usually provides some added resistance to reduce the sensitivity of the...

Страница 5: ...bond When cool check the con nection by wiggling the wire If in doubt or if the connection is not shiny re heat the joint Excess solder may be removed from a connection by heating it and allowing the solder to flow onto the iron which is then wiped on the sponge ALL SOLDER USED MUST BE ROSIN CORE Never use acid core solder or any separate flux in electronic work Silver solder is also not suitable ...

Страница 6: ...lements is left to the builder Take the time to be accurate and neat and you can be sure that your completed amplifier will meet the performance of a factory assembled unit and can con tinue to perform properly for years to come Check your work and make sure the entire step has been completed before plac ing a check mark in the space provided and continuing on to the next step KEP nuts have been s...

Страница 7: ...front The switch snaps into chassis hole PS from the outside 13 q Select the AC line cord and the plastic strain relief Separate the two conductors for 2 Cut 1 off one of the two leads and strip 1 4 of insulation from each lead Twist the strands tightly and tin each end Make a sharp V in the cord 81 2 from the longest cut end by bending it back on itself Install the relief with the small end neare...

Страница 8: ...uter tabs while the wire does not protrude into the spade clamp area Tin the bare wire end Bend the shorter middle set of tabs tightly around the bare wire and then bend the longer tabs around the insulation Then flow solder into the joint around the bare wire keeping the solder away from the spade section 29 Prepare a 2 white wire Connect one end to FC lug 2 S Select another spade lug and solder ...

Страница 9: ...dered You will be making con nections from the top side to holes 3 5 6 7 8 and 10 Make sure the proper connection point is clear at each of these If it is filled with solder running the iron along the underside will uncover the hole and it may be cleared with a wooden toothpick Now position the right module with the breaker at the front when the long bottom row of eyelets is next to the chassis wi...

Страница 10: ...terminals and the ground lug should be brought together through most of their length 68 Check all your soldered connections especially those on the fuse clip lugs which are sometines difficult to solder to Clip off any excess bare wire which could short to adjacent lugs or the chassis Pay particular attention to the stranded wires from the transformer and line cord and check the power switch conne...

Страница 11: ...lp you locate the source of a prob lem may be obtained by calling the Technical Services Depart ment at 609 662 6084 8 a m 4 30 p m E T It is helpful to know the serial number of the unit and the results of any tests you have performed SERVICING AN AMPLIFIER MODULE If you are certain that the problem is confined to one of the amplifier modules comprising the circuit board heat sink and output tran...

Страница 12: ...uired when the multi voltage transformer is used This is supplied in kits which include the special transformer If the amplifier is operated with 200 to 240 volt tines the 7 amp line fuse which is supplied should be replaced with a 4 amp Slo Blo type fuse n VOLTAGE CHART measured with 120 volt line no signal with respect to the ground buss between the two capacitors in the power supply E B c E B c...

Страница 13: ...3 XA012 XA014 XPO14 WA016 AH326 XKOll XK012 SLlll HR144 XK018 XK016 TA123 Hardware Envelope 1 Lug solder type internal tooth 6 4 Lug solder type lO 3 Lug spade l 4 12 Nut 4 40 KEP 11 Nut 6 32 KEP 4 Nut l0 32 KEP 2 Nut l 2 for fuse holder 12 Screw machine 4 x 5 16 10 Screw machine 6 x l 2 4 Screw machine l0 x l 2 4 Screw l0 x l 4 SEMS 16 Screw sheet metal 6 x l 2 1 Screw machine 6 x 3 4 4 Washer fl...

Страница 14: ......

Страница 15: ...36 RZo13 RMo21 RM013 RC023 RC053 RZOll RZOll RD114 RDl15 RC013 RW012 RW013 RM053 RDll7 RDI 17 RDll4 RDl14 RDI 13 CP115 CP134 CP135 CP136 CP136 CC125 CC125 CN113 CP133 CP134 CP135 CL122 CP135 CL122 CP135 CP135 CP133 CP135 CP135 CC125 C22 C23 C40 1 C402 C403 C404 C405 C406 C407 C408 Dl D2 D3 D4 D5 D6 D7 D8 D9 DlO Dll D12 D13 D14 D15 D16 D40 1 0 1 mfd lOOV Film 0 1 mfd lOOV Film OOl mfd 25OV Film 680...

Страница 16: ... IO kHz 0 007 20 kHz 0 012 Frequency Response into 8 ohms 3 dB 2 Hz to 160 kHz at 1 watt O 0 5 dB 6 Hz to 60 kHz at 1 15 watts Rise Time 10 kHz 60 volts peak to peak square wave 10 to 9 0 2 5 us Slew Rate 10 kHz 60 volts peak to peak square wave 30 VI s Semiconductor Complement 26 transistors 8 power Mosfets 29 diodes 4 zener diodes 1 diode bridge Typical Channel Separation 20 Hz 75 dB 1 kHz 85 dB...

Страница 17: ......

Страница 18: ......

Страница 19: ......

Страница 20: ...The amplifier circuit can safely accommodate lower impedance loads of course The conversion which takes less than an hour involves only changes to the input wiring and installation of the switch with its mounting bracket and one resistor These instructions assume familiarity with the usual kit building descriptions and reminders For more details in this regard see the con struction section of your...

Страница 21: ...tal screws Select the switch and its 2 nuts lockwasher and indexing flat washer and the switch mounting bracket Install one nut all the way onto the switch collar and follow it with the indexing washer with its lugprojecting towards the handle lever Mount the switch on the bracket so that the lever points in the direc tion of the bracket flange and the indexing lug engages the locating hole in the...

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