Main Amp Idling Current Adjustment - Harman Kardon AVR35 Service Manual

4. AM OSC Adujstment
Signal
Input Signal Source Source Signal Output Level and
step
Frequency
Connection Modulation
Signal Generator
522kHz 5mV/m(74dBu)
output to transmission
1 (230,230RDS)
loop antenna
520kHz(120)
(:standard required loop)
5. AM-Tracking Adustment (MW)
Signal
Input Signal Source Source Signal Output Level and
step
Frequency
Connection Modulation
594kHz
1
(230,230RDS)
Signal Generator
600kHz(120) 5mV/m(74dBu)
output to transmission
loop antenna
1395kHz
( standard required loop) :
2 (230,230RDS)
1400kHz(120)
6. AM IF Adjustment
Signal
Input Signal Source Source Signal Output Level and
step
Frequency
Connection Modulation
Signal Generator
999kHz
5mV/m(74dBu)
output to transmission
1
(230,230RDS)
loop antenna
1000kHz(120)
( standard required loop) :
7. AM auto stop Adjustment
Signal
Input Signal Source Source Signal Output Level and
step
Frequency
Connection Modulation
1
Signal Generator 999kHz
1000uV/m(60dBu)
output to transmission (230,230RDS)
loop antenna 1000kHz
(standard required loop) (120)
2
Reception
Adjustment Adjustment
Frequency
Point
522kHz
(230,230RDS)
400Hz 520kHz T802 1.1V 1.2V
(120)
MOD.30%
(P9)
Reception
Adjustment Adjustment
Frequency
Point
594kHz
Output level(L or R)
(230,230RDS) T801 Minimum
600kHz(120)
TAPE-OUT
400Hz
MOD.30% Output level(L or R)
CT801 Minimum
TAPE-OUT
Reception
Adjustment Adjustment
Frequency
Point
Output level(L or R)
Maximum
999kHz
TAPE-OUT
(230,230RDS)
400Hz T803
1000kHz
Output level(L or R)
MOD.30%
(120)
Maximum
TAPE-OUT
Reception
Adjustment Adjustment
Frequency
Point
999kHz
"TUNED"
(230,230RDS) VR802 indicate on
1000kHz(120)
400Hz
"TUNED"
MOD.30%
Only
AUTO SCAN indicate on
Contirm
8. Main Amp ldling current Adjustment
1) Alignment condition
Value
(1) Adjust each of the variable resistors below in both the main and surround boards to the center position :
MAIN AMP BOARD : VR401, VR402, VR501
SURROUND AMP BOARD : VR601, VR602
2) Warming up system
After he above adjustment, turn the power ON and let the receiver warm up for 5 minutes to achieve a stable temperature for the driver and
power transistors.
3) Measurement condition
Adjust each variable resistor listed below clockwise for each channel, and adjust refer the following table for the details.
CHANNEL
FRONT-L
Value
FRONT-R
CENTER
at
SURR-L
SURR-R
at
4) CAUTION
(1) whenever power or driver transistors are changed, after repair you must re-adjust the idle current for repair, have to re-adjust that idle
current again.
(2) Discharge each large elec. Capacitor C481, and C482(8200u) on main amp board, and C691, C692(6800uF/50V) on surround amp board.
Value
at
at
Value
VFD
VFD
ADJUSTING LOCATION MEASURE LOC.
VR401 R471
VR402 R472
VR501 R536
VR601 R671
VR602 R672
VOL. DROP
15mV 3mV
15mV 3mV
15mV 3mV
15mV 3mV
15mV 3mV