Panasonic SA-HT280 Service Manual page 79

SCHEMATIC DIAGRAM-13
Q604
RVTDTA114EST
LIMITER
10K
4.5V
A
10K
Q605
RVTDTA114EST
SWITCHING
10K
-7.8V
10K
D
C
B
R572
2.2K
C577 R577
16V22 47K
C578 C592
0.01
R578
47K
0V 0V
14 13 12
1 2 3
0V 0V
R576
2.7K
C576
560P
L4
A
A B A B C D
L751
100
CN901 CN902
1 2 3 4 5 6 7 8 9 10
D
To FL CIRCUIT(CP901)
on SCHEMATIC DIAGRAM-8
:POSITIVE VOLTAGE LINE
:NEGATIVE VOLTAGE LINE
-16.2V
Q651,652
R640 R615
RVTDTA143XST
680 680
0V
RELAY DRIVE CONTROL
Q651
0V
R698 R613
2.2K 2.2K
0V
0V
E
C4
C574
0.01 120P
R574 R583 C572
18K 1K 16V22
-16.2V 0V 0V
11 10 9 8
Vss
IC602
NJM2060D
BUFFER AMP
Vcc
4 5 6 7
14.4V 0V 0V
R5
R573 R690
2.7K 820
C573
560P
L5
R689
820
5.5V
R4
B C
-27.2V
-16.2V
14.4V
A B C D K D N L M E
H
CN903
1 2 3 4 5 6 7 8 9 10 1
D
D
To
To FL CIRCUIT(CP902)
on SCHEMATIC DIAGRAM-8
on SCHEMATIC DIAGRAM-8
:FM/ AM SIGNAL LINE
:CENTER SP SIGNAL LINE
Q652
0V 0V
Q603
0V
0V
10K
-7.8V
4.7K
D
0V
A
A
Q706
2SC3940AQSTA
REGULATOR
5.5V 13.8V
C710
0.01
6.1V
B
C
-16.8V
-16.2V
Q708
2SB1548PQAU
REGULATOR
C G A B P F H C D O
CN904
2 3 4 5 6 7 8 1 2 3 4 5 6 7
D
FL CIRCUIT(CP903) To FL CIRCUIT(CP904)
on SCHEMATIC DIAGRAM-8
:SUB WOOFER SIGNAL LINE
Q601-603
RVTDTA143XST
RELAY DRIVE
Q602 Q601
0V
10K 10K
4.9V -7.4V
4.7K 4.7K
-31.5V
B
Q701
2SD2374PQAU
REGULATOR
14.4V 31.1V
Q703 R707
220
14.9V 30.8V
R706
15.5V
R711
15.5V
7.5K
6.7V
Q704
6.1V
C709
16V33
Q703,704
2SC1740SSTA
REGULATOR
R722
12K
-27.9V
R725 R721 R727
820 560 330
-27.2V -38.9V
Q707
2SA1534AQRTA
REGULATOR
-31.4V
-31.4V
J I A B C D E F G
R419 100K
R420 100K
CN905
8 1 2 3 4 5 6 7 8
D
To FL CIRCUIT(CP905)
on SCHEMATIC DIAGRAM-8
0V
0V
C
1K
R726
330