Harman Kardon AVR 85 (serv.man3) Service Manual ▷ View online
3. All Clear
This service program can clear all memorized operations and functions. With the POWER ON, press the “CD” button while
pressing the “MODEs” button for more than 3 seconds. FLD shows “CLEAR MEMO” and power will be OFF.
II. ELECTRICAL ADJUSTMENT
1. Main amp idling current adjustment.
1) With the power OFF, set variable resistor R755 (Lch), R756 (Rch) RH28 (Center ch) on the PC board (P704) to the
center position.
2) Locate test points J723 (Lchan) J724 (Rchan) and J725 (Centerchan). These are 3 pin female molex connectors on the
MAIN PCB. Attach a DC voltmeter (set to a low range) to the two outer pins on each test point. This is best accomplished
by making up a “test plug” using a male molex connector that fits into the one in the unit, with wires attached, for
connection to the voltmeter. An alternate method is to use two “mini-grabbers” to attach to the two outer pins on each
connection. The middle pin has no connection.
3) After the above, adjust the idling current as follows: Turn the power ON and adjust variable resistor R755 (Lch), R756
(Rch), RH28 (Center ch) while observing the reading on the voltmeter.
*The target value is 11mV (25 mA).
NOTE:
When a unit whose idling current has been adjusted is switched on after 1 minute it reaches about 4.7~5.5mV. After 30
minutes, it reaches a balanced state and stabilizes at 8.9-11mV (target). Therefore, if the adjustment is made 30 seconds
after the power is switched on, adjust to 3.5 ~ 4.0mV. In the same way, if 1 minute has passed since the power was
switched on, adjust to 4.7 ~ 5.5mV. From 1 to 2 minutes, adjust to 6.2 ~ 6.4mV. From 2 to 4 minutes, adjust to 7.1 ~
7.6mV. From 4 to 7 minutes, adjust to 7.9 ~ 9.0mV. After more than 7 minutes since the power was switched on, adjust to
the setting of 10.5 ~ 11.2mV. Here is a reference table for the adjustment values:
Time since power switched on
Idling current adjustment
30 seconds
3.5 ~ 4.0mV
1 minute
4.7 ~ 5.5 mV
1 - 2 minutes
6.2 ~ 6.4mV
2 - 4 minutes
7.1 ~ 7.6mV
4 - 7 minutes
7.9 ~ 9.0mV
More than 7 minutes
10.5 ~ 11.2mV
III. ALIGNMENT PROCEDURES
Test Equipment Required
1) AM/FM Signal Generator
2) Video Signal Generator
3) Digital Multimeter
4) Distortion level meter
1. AM IF Adjustment
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output Level
and Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
Signal generator output to
transmission loop antenna.
(:Standard required loop)
999 KHz
(Europe)
1000 KHz
(USA)
Level 300
m
V/m (50dB/m)
Mod. 400 Hz 30%
Tuning point
LA06
Output level
(L or R)
Maximum
at TAPE-OUT
REMARK: For receiving antenna, the one supplied with the unit is adequate.
This adjustment is not normally necessary, because the coil LA06 is preset by the original supplier.
1 7
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
2. AM Tracking Adjustment
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output
Level and Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
Signal generator output to
transmission loop antenna.
(:Standard required loop)
603 kHz
(Europe)
600 kHz
(USA)
Level 300 - 400
m
V/m
Mod. 400 Hz 30%
603 kHz
(Europe)
600 kHz (USA)
LA01
Output level (L
or R)
Maximum at
TAPE-OUT
2
1404 kHz
(Europe)
1400 kHz
(USA)
Level 300 - 400
m
V/m
Mod. 400 Hz 30%
1404 KHz
(Europe)
1400 KHz (USA)
CA01
Output level (L
or R)
Maximum at
TAPE-OUT
3
Repeat steps 1 and 2 until sensitivity is maximized.
3. AM Tracking Adjustment (LW)
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output
Level and Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
Signal generator output to
transmission loop antenna.
(:Standard required loop)
171 kHz
Level 300 - 400mV/m
Mod. 400 Hz 30%
171 kHz
LA03
Output level
(L or R)
Maximum
at TAPE-OUT
2
270 kHz
Level 300 - 400mV/m
Mod. 400 Hz 30%
270 kHz
CA08
Output level
(L or R)
Maximum
at TAPE-OUT
3
Repeat step 1 and 2 until sensitivity is maximized.
4. AM Auto Stop Adjustment
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output
Level and Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Valve
1
Signal generator output to
transmission loop antenna.
(:Standard required loop)
999 kHz
(Europe)
1000 kHz
(USA)
500
m
V/m (54 dB/m)
999 kHz
(Europe)
RA11
“TUNED”
indicate on FLD
2
1000
m
V/m (60 dB/m)
AUTO
SCAN
Only Confirm
“TUNED”
indicate on FLD
REMARK: This adjustment is related to the FM muting Level Adjustment. The FM muting Level re-adjustment is necessary
after this adjustment.
5. FM MONO. Distortion Adjustment
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output
Level and Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
Signal generator output to FM
antenna terminal. (75
W
)
98 MHz
500
m
V (54 dB)
MONO 1 KHz/
Dev. 40 KHz 53.3%
(Europe)
MONO 1 KHz/
Dev. 75 KHz 100%
(USA)
98 MHz
(P2)
L201
Distortion level
Minimum
at TAPE-OUT
1 8
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
6. FM Muting Level Adjustment
Turn the variable resistor R212 until the word TUNED is not shown in the display. Then adjust the resistor R212 in the
opposite direction until TUNED is shown in the display.
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output
Level and Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
Signal generator output to FM
antenna terminal. (75
W
)
98 MHz
6.3
m
V (16 dB)
MONO 1 KHz/
Dev. 40 KHz 53.3%
(Europe)
MONO 1 KHz/
Dev. 75 KHz 100%
(USA)
98 MHz
(P2)
R212
“TUNED”
indicate on FLD
2
Over mentioned level
+3 dB
AUTO
SCAN
Only Confirm
“TUNED”
indicate on FLD
7. FM STEREO Distortion Adjustment
Adjust the L channel with the RF signal modulated only L channel first and confirm the R channel with the RF signal
modulated only R channel.
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output
Level and Modulation
Reception
Frequency
Adjustment Point
Adjustment
Valve
1
Signal generator
output to FM antenna
terminal. (75
W
)
98 MHz
500
m
V (54 dB)
L or R 1 kHz/
Dev. 40 kHz 53.3%
PILOT 19 kHz/
Dev. 6 kHz 8% (Europe)
L or R 1 kHz/
Dev. 67.5 kHz 90%
PILOT 19 kHz/
Dev. 6.75 kHz 9% (USA)
98 MHz
(P2)
IF COIL
in
FRONT END
Distortion level
Minimum
at TAPE-OUT
2
R218
Distortion level
Minimum
at TAPE-OUT
REMARK: Adjustment with R218 is not necessary when the distortion level is less than 0.5% with adjusting IF coil.
8. FM STEREO Separation Adjustment
Step
Input Signal Source
Connection
Signal
Frequency
Source Signal Output
Level and Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
Signal generator output to FM
antenna terminal. (75
W
)
98 MHz
Same specification as
FM STEREO distortion
adjustment.
Input only L channel
98 MHz
(P2)
R211
Output level
Minimum
at TAPE-OUT
channel R
2
98 MHz
Same specification as
FM STEREO distortion
adjustment.
Input only R channel
98 MHz
(P2)
R211
Output level
Similar as Rch
at TAPE-OUT
channel L
9. On Screen Display VCO Adjustment
Step
Input Signal Source and
Connection
Measuring
Position
Measuring Equipment
Input
Selector
Adjustment
Point
Adjustment
Value
1
Color bar or other standard
video signal.
Video signal generator
output to LD video input.
IC QX60
26pin and
GND
DC voltmeter
(Impedance > 10k
W
/V)
LD
CX67
2.5V
±
0.1V
REMARK: Connect the TV monitor to the monitor output terminal of the product.
1 9
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
2 0
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
ALIGNMENT AND TEST POINTS
ALIGNMENT
AND
TEST
POINTS
CX67
CA08
CA01
OSD
ADJ
16
15
1
30
QX60
PL04
-VIDEO
SELECT
OR
PCB
P104
-TUNER
PCB
R906
R21
1
R755 LEFT
R756 RIGHT
RH28
CENTER
RA1
1
R201
LA06
LA03
LA01
R218
R212
A101
J101
J723
J724
J725
P704 MAIN
PCB
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