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SA-G90
Service manual
Panasonic SA-G90 Service Manual page 70
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SCHEMATIC DIAGRAM-14
G
MAIN CIRCUIT
IC601
RSN310R36-P
POWER AMP
24
23
0V
C603
820P
C601
R603
63V33
1.8K
C
C641
R642
63V33
820
A
C602
R604
63V33
1.8K
B
D
E
D617
R723
1
31.4V
Q723
47K
RVTDTA114YST
31.1V
10K
SWITCHING
0V
R724
1
Q724
-31.5V
47K
-31.4V
10K
Q724,725
5.5V
RVTDTC114YST
SWITCHING
D732
Q725
RVD1SS133TA
0V
0V
10K
47K
-66.7V
Q777,778
2SA933SSTA
MOTOR DRIVE
FAN ON:-1.1V
FAN OFF:0V
D771
D772
D771,772
RB721Q40T77
R771
100K
C772
C771
50V4.7
50V4.7
:POSITIVE VOLTAGE LINE
:NEGATIVE VOLTAGE LINE
22
21
20
19
18
17
0V
0V
0V
-52.4V
52.5V
0V
-26.2V -8.4V -16.4V 14V
C642
820P
C604
820P
C607
18P
R607
56K
C643
18P
R643
56K
C608
18P
R608
56K
RVD1SS133TA
31.4V
C721
0.1
-31.5V
D721-728
1N5402BM21
66.8V
C702
0.1
E
F
G
D701-704
1N5402BM21
FAN OFF:-16.2V
FAN ON:-4.6V
D770
Q777
RVD1SS133TA
FAN OFF:0V
FAN ON:-0.6V
R779
10K
FAN OFF:0V
FAN ON:-0.6V
Q778
FAN ON:-4.6V
-16.2V
FAN OFF:-16.2V
R770
100K
R774
1.5M
-16.2V
:FM/ AM SIGNAL LINE
:CENTER SP SIGNAL LINE
16
15
14
13
12
11
10
0V
-1.5V
0V
-12.3V
-31.5V
31.4V
R628
R626
1W100
1W100
R627
R625
1W100
1W100
C
D
B
A
0V
10K
10K
H
Q781
2SC1740SSTA
MOTOR DRIVE
R769
FAN OFF:-16.2V
10K
FAN ON:-1.4V
Q776
2SC1740SSTA
MOTOR DRIVE
FAN OFF
:0V
FAN ON
FAN OFF:-16.2V
:-14.5V
FAN ON:-14V
-16.2V
R773
10K
FAN OFF:-16.2V
FAN ON:-13.8V
R775
330
FAN ON:-14.5V
FAN OFF:0V
Q772
2SC1740SSTA
MOTOR DRIVE
9
8
7
6
5
4
3
0V
0V
-31.2V 31.1V
0V
-66.7V 66.8V
C646
0.1
-66.7V
66.8V
N
C626
50V10
C625
50V10
-12.1V
A
B
Q775
RVTDTA114EST
OVER LOAD DET.
Q774
RVTDTA113ZST
R782
OVER LOAD DET.
39
C775
0V
16V10
1K
0V
10K
R767
150K
D769
R766
RVD1SS133TA
47K
FAN ON:-1.8V
Q780
FAN OFF:-16.2V
2SA933SSTA
MOTOR DRIVE
FAN OFF:
FAN OFF:-0.6V
0V
FAN ON:-7.1V
FAN ON:
-1.4V
C781
0.01
FAN ON:-1.5V
FAN OFF:0V
FAN OFF:0V
FAN ON:-10.1V
-16.2V
FAN ON:0V
FAN OFF:-9.4V
Q773
2SB621AQSTA
POWER SUPPLY
2
1
0V
C
A
B
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