Panasonic SA-HT280 Service Manual page 80

SCHEMATIC DIAGRAM-14
G
MAIN CIRCUIT
IC601
RSN310R36-P
POWER AMP
24 23
0V 0V
C642
820P
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
31.1V
RVTDTA114YST
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
FAN OFF:0V
FAN ON:-0.6V
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 16
0V 0V -52.4V 52.5V 0V -26.2V -8.4V -16.4V 14V
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
D701-704
1N5402BM21
FAN OFF:-16.2V
FAN ON:-4.6V
D770
Q777
RVD1SS133TA
R779
10K
FAN OFF:0V
FAN ON:-0.6V
Q778
FAN ON:-4.6V
-16.2V
FAN OFF:-16.2V
Q772
2SC1740SSTA
R770
100K
MOTOR DRIVE
R774
1.5M
-16.2V
:FM/ AM SIGNAL LINE
:CENTER SP SIGNAL LINE
15 14 13 12 11 10 9
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
G H
R782
39
Q781
2SC1740SSTA
MOTOR DRIVE
R769
FAN OFF:-16.2V
10K
FAN ON:-1.4V
FAN ON:-1.8V
Q776
FAN OFF:-16.2V
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
8 7 6 5 4 3 2
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
OVER LOAD DET.
C775
0V
16V10
1K 0V
10K
R767
150K
D769
R766
RVD1SS133TA
47K
Q780
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
1
0V
A
B
C
D
E
F
G
H
C
A
B