Harman Kardon HK775 User manual

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harman
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Owner's Manual hk775
Your
investment
in
a
component
high
fidelity
system
indicates
you
have
a
greater
than
average
interest
in
music.
The
fact
that
your
investment
includes
a
Harman
Kardon
Monophonic
DC
Amplifier
shows
us
your
appreciation
of
uncompromised
reproduction
of
the
music
you
enjoy.
Throughout
the
design
and
manufacture
of
this
unit,
we
made
every
effort
to
assure
it
will
meet
all
of
your
expectations.
To
ensure
continuing
high
performance,
read
this
manual
carefully
before
you
connect
and
operate
your
hk775.
Warning:
To
prevent
fire
or
shock
hazard,
do
not
expose
this
appliance
to
rain
or
moisture.

Connections
For
the
moment,
leave
the
POWER
LINE
CORD
(4)
of
the
hk775
unconnected.
Put
the
unit
on
the
shelf
or
table
where
it
will
be
installed.
Leave
enough
working
space
so
you
can
make
all
connections
easily.
The hk775 requires adequate ventilation. It
should
not
be
installed
on
a
cushion
or
rug,
and
a
minimum
of
two
inches’
(5cm)
clearance
should
be
provided.
(However,
hk700
series
components
may
be
stacked.)
Connecting speaker
Use two-conductor stranded wire to connect
your speaker to the power amplifier. Eighteen
(1.5mm?) gauge lamp cord (zip cord) is
satisfactory, but a heavier gauge (16 or 14
gauge) (2.5 or 3mm’) is preferable, especially
for distances over 25 feet (8 meters).
Cut a cord long enough to reach the speaker.
Separate the conductors at each end of the
cord for a length of about two or three inches
(5 to 7cm). Then carefully remove about one-
quarter inch (5mm) of insulation from each
free end. Twist the strands of each conductor
so they are smooth and tight with no loose
strands.
Lamp cord usually provides a “code” that
differentiates between the two conductors. A
conductor may be coded by a rib, sharp
corner, or indentations along the length of the
insulation. In some cases a thin colored thread
is molded inside the insulation of one con-
ductor. In others, one wire is darker than the
other, or the insulation of each conductor is a
different color.
Connect one end of the lamp cord to your
speakeras follows:
Connect the coded conductor to the speaker's
red
‘’+"'
terminal,
and
the
uncoded
conductor
to the black ‘’—"’ terminal. Find the SPEAKER
CONNECTORS (3) on the amplifier marked
SPEAKER.
Turn the red plastic thumbscrew of the
connector marked G counterclockwise to
reveal the side opening.
Insert the bare end of the coded conductor
into the opening. Turn the plastic thumbscrew
clockwise until the conductor is firmly
tightened in its place.
Unscrew
the
black
plastic
thumbscrew
of
the
connector
marked
©
and
repeat the
same
procedure
for
the
uncoded
conductor.
Connecting the hk775 to your
preamplifier or receiver
Your hk775 is fitted with pin type RCA
connector. Using a standard pin type RCA
patch cord, connect the preamplitier output
connector with the INPUT connector (2) of
your hk775. Push the plug in all the way so it
is firmly seated, making good electrical
contact.
If your control amplifier does not accept a pin
tyoe RCA connector, consult your audio
dealer for a patch cord with a proper adapter.

AC convenience outlet*
The AC outlet (5) on the rear panel provides
power connection for your control amplifier or
other equipment drawing as much as 500
watts. The outlet is unswitched and provides
power regardless of whether the hk775 is on
or off.
Power connection
If you have completed the connections above,
you are now ready to place the hk775 in its
permanent position and plug the POWER LINE
CORD (4) into an AC outlet. To turn the unit
on and off, press the POWER SWITCH (8).
When power is on, the POWER indicator (6)
will light.
Power level display
The power output of the hk775 can be
monitored by observing the LEDs on the
POWER LEVEL DISPLAY (9).
The display may be turned on or off with the
DISPLAY
pushbutton
(10).
With
the
DISPLAY
SENSITIVITY pushbutton (11) in the x!
position
and
8
ohm
speaker
connected,
the
power output reading will range from 0.1
watts to 200 watts as indicated by the left 88
scale. When a 4 ohm speaker is connected,
reading should be taken from the right 482
scale
which
indicates
the
power
output
from
0.2 watts to 400 watts.
At
low
listening
levels
you
may
wish
to
in-
crease
the
display
sensitivity
by
pushing
the
DISPLAY
SENSITIVITY
pushbutton
(11)
to
the
x0.1
position.
In
this
position,
the
8
scale
ranges
from
0.01
watts
to
20
watts,
the
482
scale
ranges
from
0.02
watts
to
40
watts.
Filters
To
minimize
unwanted
super-high
frequency
noises,
depress
the
ULTRASONIC
filter
pushbutton
(13).
|
To filter out extremely low frequencies,
depress the SUBSONIC filter pushbutton (12)
to its ‘on’ position (in).
*In some countries, owing to Safety Agency
Electrical requirements, this AC receptacle is
covered.

The Harman Kardon
Model hk775
Monophonic Amplifier
-
Jechnical
Manual
harman/kardon

PRECAUTIONS
1. Always disconnect the chassis from power line when soldering. Turning the power switch OFF is not enough. Power
line leakage passing through the heating element may destroy the transistors.
2. Never attempt to do any work on the transistor amplifiers without first disconnecting the AC fine cord and waiting
unti! the power supply filter capacitors have discharged.
3. Replacement for output and driver transistors, if necessary, must be made from the same beta group as the original
type.
4. If one output transistor burns out (open or short) always remove all the output transistors in that channel and check
the bias adjustment, the control and other parts in the network with an ohmmeter before inserting a new transistor.
All transistors in one channel will be destroyed if the base biasing circuit is open on the emitter end.
5. When mounting a replacement power transistor, be sure that the bottom of the flange, the mica insulators and the
surface of the heat sink are free of foreign matter, for they may cause transistor failure.
6. Silicon grease must be applied between the transistor and the mica insulator, and between the mica insulator and the
heat sink for better heat conduction.
7. Fuses must be replaced with size and type indicated. Use of other types can expose components to destructive
current levels.
ALIGNMENT PROCEDURES
DC VOLTAGE BALANCE ADJUSTMENT
Equipment Required: DC Voltmeter
DC voltmeter to SPEAKER terminals VR401 OV +t10mV
IDLING CURRENT ADJUSTMENT
Equipment Required: DC Voltmeter
Connect
Output
Meter
To
Adjust
For
DC
voltmeter
to
TP1
(+)
and
TP2
(—)
VR402

ALIGNMENT PROCEDURES
POWER LEVEL DISPLAY SENSITIVITY ADJUSTMENT
Equipment Required: Audio Signal Generator and AC VTVM
Notes: 1. Connect signal source to INPUT jack.
2. Press in DISPLAY SENS. push button to x0.1 (button in) position.
Step Signal Source Connect Output Meter To Adjust For
8 ohm dummy load and AC
VTVM to SPEAKER terminals
Signal source
output level
1 kHz 12.65V on AC VI VM
1 kHz,
—1 dB output level
Topmost LED
lights to glimmer
Fig. 1 — Alignment Points Location

GENERAL UNIT EXPLODED VIEW
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SCHEMATIC DIAGRAM
Q415 Q417 Q401 Q402 0409 0405 0406 Q411 Q419 0413 0423 0420 04;
ee 2SA999L (F) fae, R411 2SC.2320L (F} 2§C1775 (F) 2SA968(O)or(Y) 2SD467(C) 2SB649 (Cc) 2SC 2238.
13V
aes
bead
C404
10/16V
R419
3.3k
ie C17
22/100V
D403
182471
R420
10k
Sw501
ULTRASONIC
FILTER
10/16*
C501 C502
100/16V 100/16V 182471
eo ®
C503 C504
1/50V_1/50V
22/100V
R501
470k -13V R479 R413
C405 4.7k 1/2W 10k
10/16V
- Q416 Q403 0404 a410 Q407 408 Q412 0422 0421 0426
2SC2320L (F) 2SA999L [(F} 2S8A872 {E) 28C2238 (O) or (Y) 2SD669 (C) 2SB561 (C) ~—s_-2s
D402 :
RD13EB2 o8V
L413 &
57.2V 11.7V A
R465
a5 . \A 28C1419 (C)
3W
Eee) "
C417
0.039
D11
D117 | RD12EB3
RD15EB
Ic2
R16 R18 C25
TE1 1/50V
SPEAKER (7) a eran
TERMINAL
RED ac
Soeeee TA7318P
TERMINAL) vw
BLACK si swe moe ies Seeeaeie
DISPLAY
DISPLAY
——=—OOO=0)
==
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SENSITIVITY
3-) OC 3-) OC VRI
2 22k (B)
As jk
DP1 S$-5014CT POWER LEVEL DISPLA*

4
O} or (Y)
0425
‘A968 (O) or (Y)
~
Q427 0428 0429 430 D405 D406
2$C2564 (0) or (R) 10DF2
AN D14
$10VB40
1500/71 4
os os
15000
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FU2
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D1 D2 D3 D4
10DF2
AN
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UNSWITCHED
DS
1SR35-200
Q431 Q432 Q433 0434
2A 1094 (0) or (R)
0.68V @
Q437 a Ne
2$A872(E)
a4
2SC 2603 (F)
Q436
28C1775 (F)
Q1 02 Q3 Q7
2SC 2603(F)
D409 D410
182473
R487
NOTES:
1. ALL RESISTANCES ARE 1/4 WATTS, UNLESS OTHERWISE NOTED, VALUES ARE IN 22.
K = 10002, M= 1000K{2
2. ALL CAPACITANCES VALUES ARE-IN uF UNLESS OTHERWISE NOTED. pF = pyr
3. ALL VOLTAGES READING FROM CHASSIS ARE MEASURED WITH V.T.V.M. UNDER NO SIGNAL
CONDITIONS.
age eee COMPONENTS IN ACCORDANCE WITH PRESENT SAFETY REGULA-
TIONS, THESE COMPONENTS MUST ONLY BE REPLACED BY ORIGINAL PARTS.

POWER OUTPUT & PROTECTION P.C. BOARD
POWER OUTPUT & RECTIFIER P.C. BOARD

L408 R462
CHIL 2 CTT =z
<2 4
Coe samps
= p38
CIID» ¢[t¢]} oo
-dmD*+ClD+8
Ref. No.
R446/447,
448/449
C17, 18, 19, 20
Q1, 2,3, 4
Q427, 428
0431, 432
Q436
0437
D5
D6, 409, 410
L405, 406,
407, 408
Ref. No,
R450/451,
452/453
C10, 11
C12, 13
0429, 430
0433, 434
D1, 2, 3, 4,
405, 406
L409, 410,
411,412
L413
Part No.
Description
RESISTORS, CEMENT
5273-R33672
0.3392 +10% 3W x2 Special Dual
CAPACITORS, ELECTROLYTIC
5345-226J0211
22uF +20% 100V
TRANSISTORS
5613-2603(F)
5613-2564 (O)
561 1-1094(O)
5613-1775(F)
5611-872(E)
DIODES
5632-1SR35-20
5636-1$2473
2SC2603(F) Overload Protector/Muting
2S8C2564(O}or(R)
2SA1094(O)or(R)
28C1775(F)
2SA872(E)
Power Output
Overload Protector
1SR35-200
1$2473
MISCELLANEOUS
5597-45502
Part No,
Ferrite Bead
Description
RESISTORS, CEMENT
5273-R33672
0.3392 +10% 3Wx2 Special Dual
CAPACITORS, ELECTROLYTIC
5345-108-50
5341-108H0270
1000uF +50%—10% 50V
1000u:F +20% 80V
TRANSISTORS
56 13-2564 (O)
5611-1094 (QO)
DIODES
5632-10DF2
2SC2564(O)or(R}
2SA1094(O)or({R)
}
Power
Output
10DF2
MISCELLANEOUS
5597-45502
5991-7125
Ferrite Bead
Coil, RF Choke

POWER LEVEL DISPLAY DRIVER P.C. BOARD
teri o- \A3y
Ref. No.
R24
VR1
ICI
IC2
IC3
Q5
Q6, 7
DS, 10
D12
Part No. Description
RESISTORS
5102-1014713 10082 +2% 1/4W Fuse
5101-2238575 Variable Resistor, 22k{2(B)
INTEGRATED CIRCUITS
5652-IR2406G IR2406G Power Level Display Driver
5652-uPC741 uPC741 Buffer Amp.
5652-TA7318P TA7318P Linear-Log Converter
TRANSISTORS
56 13-1419(C) 28C1419(C) Voltage Regulator
5613-2603(F) 28C2603(F) Muting
DIODES
5635-RD15EB Zener, RD15EB
5635-RD12EB3 Zener, RD12EB3
5636-1S2471 182471
FILTER SWITCHES P.C. BOARD
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SW501_ . . SW502._
SUBSONIC ULTRASONIC
SW501,
502
Ref. No.
Part No. Description
4431-01027369 Push Switch,
Subsonic Filter,
Ultrasonic Filter

PRE-DRIVER P.C. BOARD
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Ref. No. Part No. Description
RESISTORS
R403,
404,
5102-1524713
1.5kQ.
+2%
1/4W
Fuse
409, 410
R431,
432
5102-5604713
56Q
+2%
1/4W
Fuse
VR401
5101-1027875
Variable
Resistor,
1k(2(B)
TRANSISTORS
Q401,
402
5613-2320L(F)
2$C2320L(F)
Q403, 404 5611-999L(F) 2SAQ99L(F) | ce rental Am
Q405,
406
5613-775(F)
2SC775(F)
P:
Q407, 408 5611-872(E) 2SA872(E)
0409 5613-2320L(F) 2SC2320L(F)
Q410 5611-999L(F) 2SA999L (F) seas,
Q411 5611-968(0) 2SA968(O)or(Y)
Q412 5613-2238(O) 2$C2238(O)or(Y)
Q415, 417 5611-999L(F) 2SA999L(F) \ yy,
Q416
5613-2320L(F)
2SC2320L(F)
g
DIODES
D401, 402 5635-RD13EB2 Zener, RD13EB2

DRIVER P.C. BOARD
0413
=
Lu
Lu
cc
Ref. No.
R438, 439
R443
R473, 474
V R402
0413
Q419, 425
Q420
0421
Q422, 424
Q423
0426
D403, 404
1401, 402,
403, 404
@) —
<Gy —<c—! 2. R474
Q423
Q426
L403
eC
R467
+}
-C*
Part No. Description
RESISTORS
5102-4705114
5102-2705114
5102-3904713
5101-1517475
47982 5% 1/2W Fuse
2782 5% 1/2W Fuse
399) +2% 1/4W Fuse
Variable Resistor, 150{2(B)
TRANSISTORS
5614-467(C) 2SD467(C) Bias Stabilization
5611-968(0) 2SA968(0)or( Y)
5612-649(C) 2SB649(C)
5614-669(C) 2SD669(C) ee
5613-2238(0) 2SC2238(O)or(Y) (7%
5614-467(C) 2SD467(C)
5612-561(C) 2SB561(C)
DIODES
5636-1S2471 12471
MISCELLANEOUS
5597-45502 Ferrite Bead

POWER SUPPLY P.C. BOARD
TETT- Freee
Ref. No. Part No. Description
C2,3 534 1-15920272 Capacitor, 15000uF +50%—10% 71V Electrolytic
D14 5685-S10VB40 Bridge Silicon Diode, S10VB40
FU2, 3 5732-162031 Fuse, 1.6A 125V

WIRING DIAGRAM
DRIVER P.C. BOARD PRE DRIVER P.C. BOARD
D7
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POWER OUTPUT & PROTECTION P.C. BOARD @
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POWER OUTPUT & RECTIFIER P.C. BOARD
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ORANGE ORANGE
a |

FILTER SWITCHES P.C. BOARD
DP1
POWER LEVEL
DISPLAY
sw2
DISPLAY %
8 SENSITIVITY DISPLA
ER
ATOR a POWER LEVEL DISPLAY
DRIVER P.C. BOARD
YELLOW
RED
PURPLES
BLACK
PURPLE
YELLOW
ORANGE
f;
IN UT Tee
SB
sw
_LOW POWER
BROWN
=
S
|
4 SPEAKER ors
TERMINAL
TERMINAL
UNSWITCHED
RED BLACK
m7
SS
SS
BROWN
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YELLOW
BLACK
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ORANGE
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