Panasonic SC-AK48 Service Manual page 55

SCHEMATIC DIAGRAM-16
L
POWER AMP CIRCUIT
IC500
RSN311W64A-P
POWER AMP(HIGH,MID,LOW)
26 25 24 23 22
0V 0V 0V
R502
4.7K
C500 470P
R501 4.7K
C510 470P
C514 470P
C508 470P
R507 R513
4.7K 4.7K
R508 R526
4.7K 4.7K
A B C D
C509
0.01
CP501
GND1 1
+B(3)
2
H.Lch IN
3
H.Rch IN 4
E
To MAIN (DSC)
LOW Rch IN
5
CIRCUIT(CN300)
GND1
6
on SCHEMATIC
7
DIAGRAM-11
LOW Lch IN
8
/CD
9
DC DET 10
P.CONT
11
HP SW
12
CP500
P.GND
1
D.GND
2
+B(4)
3
-B(1) 4
E
To MAIN (DSC) FAN1
5
FAN2
CIRCUIT(CN301) 6
on SCHEMATIC +B(1) 7
+B(2)
DIAGRAM-11 8
+B(6)
9
-VP 10
11
LED9V
12
+B(5)
:NEGATIVE VOLTAGE LINE
:POSITIVE VOLTAGE LINE
21 20 19 18 17 16
0V -28.5V 60.2V 0V 0V -30V
R505 3.3K R532 56K
C526 15P R555
R506 3.3K R533 56K
C527 15P R560
R534 56K
C528 15P R557
R535 56K
C529 15P R558
R536 56K
C530 15P R556
R537 56K
C531 15P R559
5V
Q505
5V
0V
Q503
E F
Q503,505
KTC3199GRTA
OVER LOAD DET.
Q520
KTC3199GRTA
POWER SUPPLY CONT.
R607A
150K
14.3V
Q521
KRA102MTA
A
POWER SUPPLY
B
D
C A
B
C
D
E
D501 D502
F
1D3E RL1N4003S-P
15 14 13 12 11 10 9
29.5V -0.2V 6V 0V 0V 0.2V
120K
120K
120K
150K
220K
180K
0V
E
0V 14.3V
B
0V
0V
Q521
D515
F
RVD1SS133TA
Q510
2SD2144STA
SWITCHING
R554
0.2V
10K
0V
A
D503
RL1N4003S-P
55
:FRONT LOW SP DRIVE SIGNAL LINE
:FRONT MID/HIGHT SP DRIVE SIGNAL LINE
8 7 6 5 4 3 2
0V -29.7V 29.1V 0V -60.7V 60V 0V
R552 2.2
R553 2.2
R511
1M
R510 R525 C517
14.8V
18K 18K 50V1
8.4V
Q511
8.8V
C538 C504
50V1 1800P
R562
100K
C548 C555
14.8V
1800P 1800P
6.5V
Q518
C556 C557 5.9V R566
50V1 0.01 20K
Q511,514,517,518
KTC3199GRTA
R542
1M
H.P.F./L.P.F.
R545 R548 C518
14.8V
18K 18K 50V1
8.6V
Q514
8.8V
C542 C520
50V1 1800P
R573
100K
C580 C581
14.8V
1800P 1800P
6.5V
Q517
C551 C582 6V R530
50V1 0.01 20K
14.8V
14.5V
7.7V
-7.9V
3.3V
5V
-31V
10V
SA-AK48
1
0V
A
B
C
D
E
F
A
B