Harman Kardon 730 User manual

The Harman/Kardon
Model 730
AM/FM/Stereo FM
Solid State Receiver
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 line cord and
waiting until 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.
-2

ALIGNMENT PROCEDURES
Step
1
2
3
Step
1
2
3
Step
1
2
3
SEPARATION ADJUSTMENT
INSTRUMENTS: Stereo Signal Generator
VTVM
NOTE: Set Function Selector Switch to FM.
Connect Signal Source to FM Antenna Terminals.
DIAL
FREQUENCY SIGNAL STRENGTH
SETTING
CONNECT OUTPUT TO
98MHz
1mV (60dB) Tune for Zero VTVM to Left
Right Signal
Volts DC at
Tape Out Jack
R220
(15 kohm)
98MHz
VTVM to Right
Left Signal Tape Out Jack
Get best balanced minimum output after repetitive check between right and left above.
STEREO INDICATOR LAMP ADJUSTMENT
INSTRUMENTS: Stereo Signal Generator
NOTE: Set Function Selector Switch to FM.
Connect Signal Source to FM Antenna Terminals.
DIAL
FREQUENCY SIGNAL STRENGTH SETTING
OUTPUT
98MHz
32µV (30dB) Tune for Stereo Indicator
(Stereo Zero
Volts Lamp
Signal) DC at
R220
(15 k ohm)
ADJUST
VR302
VR302
ADJUST
VR353
Check Pilot level that Stereo Indicator lights at 6% of pilot level and that the indicator does not light at 1 %.
Return pilot level to 9% and check Stereo Separation at 1 kHz, 100Hz and 1 0kHz.
QUIETING METER ADJUSTMENT
INSTRUMENT:
FM Signal Generator
NOTE: Set
Function Selector Switch to FM.
Connect Signal Source to FM Antenna Terminals.
DIAL
FREQUENCY
SIGNAL STRENGTH
SETTING
OUTPUT
ADJUST
---
-----
Quiet Point Quieting Meter VR351
on Band
---
-----
VR352
98MHz
20µV (26dB) Tune for Zero VR351
Volts DC at
R220
(15 k ohm)
-3-
ADJUST FOR
Minimum Output
Minimum Output
ADJUST FOR
Light ON
ADJUST FOR
Needle to Deflect
Over Zero (to Right)
To Indicate Zero
To Indicate 6
I
I>
Step
1
2
3
4
5
6
7
8
9
10
Step
1
FM ALIGNMENT PROCEDURE
INSTRUMENTS:
FM Signal Generator modulated with 1000Hz at 100%. (75kHz)
AC/DC VTVM and Oscilloscope.
NOTE: Set Function Selector Switch to FM.
Connect ~ignal Source to FM Antenna Terminals.
DIAL CONNECT OUTPUT
FREQUENCY
SIGNAL STRENGTH
SETTING
METER TO
--- -----
Quiet Point Oscilloscope to
on Band
R220 (15 kohm)
--- -----
Near -1dB of Limiter Tune for
Oscilloscope to
98MHz
Saturation Zero Volts Tape Out Jack
DC at
R220
(15 k ohm)
Repeat Steps 2 and 3 until no further improvement is noticed.
90MHz Approx. 10µV 90MHz Oscilloscope to
R220 (15 k ohm)
106MHz
Approx. 1 0µV 106MHz
Repeat Steps 5 and 6 until no further improvement is noticed.
90MHz -3dB of Limiter Tune for VTVM and Oscilloscope
Saturation Zero
Volts to Tape Out Jack
DC at
R220
(15kohm)
106MHz
Repeat Steps 8 and 9 until no further improvement is noticed.
MPX ADJUSTMENT
INSTRUMENT: Frequency Counter
Signal Generator
NOTE: Set Function Selector Switch to FM.
Connect Signal Source to FM Antenna Terminals.
DIAL
FREQUENCY
SIGNAL STRENGTH SETTING
CONNECT OUTPUT TO
98MHz
1mV (60dB) Tune
for
Frequency Counter
(unmodulated) Zero
Volts to LP301
DC at
R220
(15 k ohm)
-4-
ADJUST
IF Top
and Bottom
(on Front
End)
T201 Top
T201
Bottom
LO(on
Front
End)
TC0(on
Front
End)
LR1
LR2
LA
TCR1
TCR2
TCA
ADJUST
VR301
ADJUST FOR
Maximum Noise
Zero Volts DC
Maximum Symmetry
on Oscilloscope
Zero Volts DC
Zero Volts DC
Maximum Output
Maximum Output
ADJUST FOR
19kHz ±50Hz

AM ALIGNMENT PROCEDURE
INSTRUMENTS:
AM Signal Generator modulated with 400Hz at 30%.
VTVM.
AM Sweep Generator and Oscilloscope.
NOTE:
Set Function Selector Switch to AM
Connect signal source to a test loop placed to radiate signals into AM Antenna Loop Stick (L252).
CONNECT OUTPUT
DIAL
Step
SIGNAL SOURCE FREQUENCY
METER TO
SETTING
ADJUST
ADJUST FOR
1 AM Sweep Generator 455kHz
VTVM and Oscilloscope Quiet Point
T252
Maximum and Top
to R272 (4.7 k ohm)
Near (Ceramic Flat Pattern
1600kHz
Filter)
on Oscilloscope
2 T253 Maximum Output
3
T254 Maximum Output
4 Repeat Steps 1 through 3 for best sensitivity.
5
AM Signal Generator 600kHz VTVM and Oscilloscope
600kHz L251 Maximum Output
to R272 (4.7 k ohm)
6 1600kHz 1600kHz
TC1 Maximum Output
(on Front
End)
7 Repeat Steps 5 and 6
for best dial accuracy.
8
AM Signal Generator 600kHz VTVM and Oscilloscope
600kHz
L252
to R272 (4.7 k ohm)
T251 Maximum Output
9 1600kHz
1600kHz
TC2
Maximum Output
TC3
10 Repeat Steps 8 and 9 for best sensitivity.
POWER AMPLIFIER IDLING ADJUSTMENT
INSTRUMENTS:
DC VTVM
NOTE: Set Function Selector Switch
to AUX
Set Volume Control to minimum and set Tone/Balance controls to mid position.
Set Stereo/Mono Switch to Stereo.
Speaker Switch to ON.
Connect 8 ohm (50W) resistor across left and right speaker terminals.
Step
CONNECT OUTPUT TO
ADJUST
ADJUST FOR
1 DC
VTVM between 0418 (collector)
VR402
35mV ±5mV
and 0420 (Collector)
2 DC
VTVM between 0417 (collector)
VR401
35mV±5mV
and 0419 (Collector)
-5-
SCHEMATIC DIAGRAM -FRONT END
0
<:t
~
en
C")
1-
w
LL
LL
1-
LLL::::,
LL-o
a:
_,J
.....
.....
-
.....
I!) >
M-..,t
ro ['-..
+N
..--
r-,0
a:~
.....
.....
.....
..__
a._
(()g ---~
Uo I'
~I
l.
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I'--
.......
.......
......
.......
.....
.......
""
......
IDO
a:o
~
.......
.......
.......
....... -...J
-6-
......
......
.....
.....
......
.....
.....

'I
I
00
I
u,
0
....
a
3:
s
m
~
....
0
"ti
<
m
~
IF~-
botto~
,~
I
T201 :: -=
bottom
-----~
~ 4
1-'' ff.
1
i
-I I··--'
:;o~ r-..::,
"
I ,~ : •~
~-' .
\ ID'
~~
,!
·- ..._,
~-C)
-~
-~~
"-'
<C
VR401
VR402
;
VR302
LO TC 0
IF T201
top top
R220
15 k ohm
Li
-----L252
.. TC 1
I. TC 2
, .. _.,I· TC3
.. -. '
~ :!JI TC R2
~ • ~- TCR1
i, Si! ,-,,~ TC A
~•iw:J LR1
~ ~~"/'
1
F''
1
1l1t ::: LA
1
i'. ·11 LR2
.. ,I L251
I I T251
~ ,~ T252
, ti. T253
I II T254
)>
...
c5
z
3:
m
z
....
-a
0
z
~
I II R272
-- ·11 4.7 k ohm
VR301 LP301
:: VR 353
VR352
VR351

WIRING DIAGRAM- REGULAR AND MULTIVOLTAGE
FRONT END
,-
I
I
I
I
--7
I
YELLOW
GREEN
BLACK
ORANGE
I
C220
I
C219
I
I
I
I
I
I
I
I
I
-9-
MAIN RECTIFIER P.C. BOARD
TO LP10
TO LP11 -~===:::::!J
TO LP2
TO LP3
GREEN
GREEN
RED
PURPLE
PURPLE
VR354
MUTE ADJUST
SW2
FM MUTING
MODE/CONTROL
CIRCUIT SIDE B
WHITE
TO LP603
LAMP P.C. BOARD
:, /:_i ',:
: /~Jt:1'~~~4,;§;~;
0
1~
1
:E"
BLUE
YELLOW
GRAY
TO
LAG RECTIFIER P.C. BOARD
BLACK
BLUE
~--+~B~LA~c~•~•TO EARTH
TO MAIN RECTIFIER
P.C. BOARD
.___--,
GREEN
SPEAKER
PROTECTOR
-10-
RED
ORANGE
RED
WHITE
GREEN
PURPL
08-t\NGJ:
BLUE
YELLOW
GRAY
BLUE
TO LP19 :::::::::::_.
SUB RECTIFIER - RED
P.C. BOARD
MODE/CONTROL
CIRCUIT SIDE A
BLUE
ORANGE
WHITE

WIRING DIAGRAM
FU5 rG.:.:,R~E:;,;EN:,:_ _________________________________________________ ~~
250V 3A
GREEN
BLACK
BLUE
BLUE
GREEN
TO LP502 BLUE
TONE CONTROL P.C. BOARD-="'"-----+
TO CHASSIS
YELLOW
- 11 -
TO
LP503 RED
S01
~ SWITCHED
"'
(!)
GRAY
0
0
TO MAIN A~P IN JACK
(L) (RI
W.J 2
-' LJJ
g, LJJ
::J "'
>===o..=.J 1
I
I
I
I
I
)BLACK
_ _l!IE--,-+B:;.;L;;:.A.;;q~..L. TO
LP501
(J
BLACK I
,-.rn J2 EARTH
I
i
GREEN
'----=:.:a:.~-+--+--SPEAKER
BLUE OUTPUT
.._ __ (_) .;;.;;.;;;.=..---4---41---1EARTH
I
S02
UN SWITCHED
P1
CB1
(R)
PL1
POINTER LAMP
PL9
RED
RED
GREEN
BLACK
PWR SWITCH LAMP -~-.....:B~L~U~E _______ _,
SUB RECTIFIER
CIRCUIT SIDE
~r-ll---------1---.:.:G.:.:,R.._EE=,:N.:....;-TO LP559
~ PURPLE _. TO LP
560
TO SWS
(!)
CB2
(L)
SPEAKER
PROTECTOR
- 12 -
,.,:
u
<(
-'
a,
:c
s:
w
(!)
z
<(
cc
0
TO CO-AA5
0
AM/FM TUNER/ IF, P.C. BOARD
TO CO-GG3
FUNCTION SWITCH
L...:~-TO CO-AA7
AM/FM TUNER/IF, P.C. BOARD
FU6
250V 1A

WIRING DIAGRAM -MULTIVOLTAGE
GREEN
BLACK
WHITE
BLACK
RED
FUS rG~R~E~E~N _________________________________________________ _..:;~~
250V 3A
GREEN
BLACK
BLUE
BLUE
GREEN
TO LP502 BLUE
TONE CONTROL P.C. BOARD•=~---+
TO CHASSIS
-13-
S01
~ SWITCHED
a:
<..?
GRAY
MAIN RECTIFIER 0
0
S02
UN SWITCHED
TO MAIN AMP IN JACK
(L) (R)
-BB
LE
'"
...J
0..
a:
::J
0..
z
w
w
a:
<..?
BLACK
LP501
J2 EARTH
GREEN
Pl
CB1
(R)
PL1
POINTER LAMP
PL9
RED
RED
GREEN
BLACK
PWR SWITCH LAMP -~-B~L~U~E._ ______ .J
SUB RECTIFIER
CIRCUIT SIDE w
<..?
z
"' ~
~ Q
...J w
a, t:::
.u
<..?
z
<(
a:
0
TO CO-AAS
AM/FM TUNER/ IF, P.C. BOARD
-----TO CO-GG3
~---------...,_ __ _.G_.R,._E,.EN"'---- TO LP559
~ PURPLE .. TO LP
560
TO SWB
<..?
CB2
(L)
SPEAKER
PROTECTOR
-14-
FUNCTION SWITCH
'--,;,,;R.=.ED:;.,;i ► TO CO-AA7
AM/FM TUNER/IF, P.C. BOARD
GREEN
FU6
250V 1A

SCHEMATIC DIAGRAM -MODEL 730
SYSTEM INTERCONNECTION
....... '-AM-4---------<"JLP201
10
PHON0(2)
PHON0(1)
AUX(2)
AUX(1)
TAPE IN(1I
TAPE IN(2)
TAPE OUT(1
PHON0(2)
PHONO(I)
SW1E
AUX(2)
AUX(1)
TAPE IN(1)
TAPE IN(2)
TAPE OUT(1)
TAPE OUT(2)
FRONT ENO
3.7
LP25t
C253
5p
CO-HH4
L CH
IN
C0-HH1
R CH
IN
LP252
TC3
+B3
L201
270p
IC219
LP253
TCl
VCl
LP703
+B
LP701
OUT
LP702
-B
LP704
OUT
SW1C
SW7B
CONTOUR
-15 -
LP511
+B
LP508
L CH
IN
LP504
LP509
-B
LP506
R CH
IN
LP505
AM
OUT
C0-A2
+
X
ME1
FM QUIETING
AM TUNING
CO-A3
LP512
OUT
!..P509
I
LP511
+B
LP510
,OUT
LP509
-B
+B1
CQ-A6
A1
L CH
-B1
FM
STEREO
OUT
R CH
FM
STEREO
QlJT
CO-A
A2
CO-A7
CO-A5
CO-A1
CO-A12
+B
LP511
LP503
~ LP6
C0-8
_co-sss
+B2
+B1
SP SVTEM 1
C0-01
CO-B
L CH
OUT
IN
LP502
~LP7
LP509
-B2
_CO-BB4
-B
CO-B4
-B1 A438
LOW CUT HI CUT 330
½W)
SW10B SW6B
i°J2
HEADPHONE
LP511
_co-cc5
3~~rY,W)
co-cs
LP509 +B2
CO-Cl
CO-C6
R CH
OUT
IN
SP SYSTEM 2
100k
co-c
----:~2 CC4
-16-

SCHEMATIC DIAGRAM - MULTIVOLTAGE - MODEL 730
AM/FM TUNER.IF, MPX
,,.,,0-----------------------------------------------------------1-----------,
CO-HH4
L CH
IN
CO-HHl
R CH
IN
..,
TO FRONT
END
"''"
EQUALIZER AMP
0701, 0702
2SA872(E)
C702
22/lOV
R704
220
R702 R706
TOOk TOOk
C701
22/10V
R703
220
R701
TOOk
c, ..
10/16V
0253
2SC460{CI
0703, 0704
0705, 0706
2SC1345(E) 2SC1345(E)
LP511
+B
LPSOS
L CH
IN
LP701
LP504
L CH
OUT
LP509
-B
+ LP506
R CH
IN
LP704
LPSOS
R CH
OUT
- 17-
TONE/ PRE
AMP
100k
I
lcso2
!0,061
I
I I
I I
I I
I I
' '
BALANCE VOLUME
i i
I I
I I
I I
I I
I I
I
I
I
I
VR501 /
100k
R214
""
D252~0254: 1N60P
CO-A2
CO-AJ
AM OUT
METER
• OUT
X
0501·,0502
0503--- 0508
2SA844(E) 2SC1345(E)
VR506
50k
LP512
L CH
OUT
'
I )
I I
I I R540
I I 220k
I I LP509
I I
BA
0
SS ' TREBLE
I I
~
I
I
LP511
', VR505 I
'50k
I
R517 I
6.Bk
LP510
R CH
OUT
~--------------->-----~LP509
""
,,
R3S7
,oo
0304-.....0J14
2SC13351EJ
0501, D502 0503, D504
EOA01-20 SIB01-02
LP503-LP6
+B2
LP511
LP509
LPso2-LP7
D503
-82
LP511
LP509
POWER
CO-Bl
+
L CH
C402
IN
100/l0V
CO-Cl
R CH
C401
IN 100/lOV
0301, 0302
2SC133S(EI
AMP
0401 .......... 0406
2SC1400(UA)
0411, 0412
2SD415(R)
D401~0406: 1S2076
18 -
""'
"
LOW PASS
FILTER
'
0407,0408
2SD549(0)
0413,0414
2S8549(R)
""'
"
----<"1-;.------+-lf--6co-Ae
L CH
FM
STEREO
OUT
f-+----;-<) ~-o---!------1---+---f>co-A9
fl.CH
R32I
4.7k
0409, 0410
2SC853(L)
0415, 0416
2SD415(R)
~~83
0318
2SA83&(El
0417, 0418
2S8541{SorR)
C0-85
CO-B4
0419, 0420
2SD388{SorR}
co- 5
~REC
out
CO-A7
+83
CO-AID
CO-All
0-Aa
_____,.CO-BBS
+B1
CO-B6
L CH
OUT
_____.CO-B84
81
_____,..CO-CC5
+82
co-cs
R CH
OUT