Power Circuit - Panasonic SA-AK88 Service Manual

SCHEMATIC DIAGRAM-22

POWER CIRCUIT

IC500
RSN311W64A-P
POWER AMP(HIGH,MID,LOW)
26 25 24 23
0V 0V 0V
R502
4.7K
C500 470P
R501 4.7K
C510 470P
C514 470P
C508 470P
R507 R513
4.7K 4.7K
R508 R517
4.7K 4.7K
E D C
C509
0.01
CP501
GND1
1
+B(3)
2
H.Lch IN 3
H.Rch IN
4
LOW CH 5
TO
GND1
6
MAIN (CONTROL)
S CH
7
CIRCUIT(CN300)
C CH
8
ON SCHEMATIC
/CD
9
DIAGRAM-21
DC DET 10
P.CONT
11
HP SW 12
CP500
P.GND 1
D.GND
2
+B(4) 3
-B(1)
4
TO
GND1
5
MAIN (CONTROL)
6
CIRCUIT(CN301)
+B(1)
7
ON SCHEMATIC
+B(2) 8
DIAGRAM-21
+B(6)
9
-VP
10
11
LED9V
12
+B(5)
22 21 20 19 18 17 16
0V -28.5V 60.2V 0V 0V
R505 2.7K R532 56K
C526 15P R555
R506 2.7K R533 56K
C527 15P
R534 56K
C528 15P R557
R535 56K
C529 15P R558
R536 56K
C530 22P R556
R537 56K
C531 22P
Q505
5V
0V
Q503
A B
Q503
2SC2785FTA
OVER LOAD DET.
A
B
C
D
E
B
A
R562
8.2K
C554
10V470
D501 D502
1D3E RL1N4003S-P
8.6V
:POSITIVE VOLTAGE LINE
:NEGATIVE VOLTAGE LINE
15 14 13 12 11 10
-30V 29.5V -0.2V 0V 0V
120K
R560 120K
120K
150K
220K
R559 180K
5V
0V
Q505
KTC3199GRTA
OVER LOAD DET.
Q510
2SD2144STA
SWITCHING
R554
0.2V
1K
0V
D503
RL1N4003S-P
:CD-DA/V-CD (AUDIO) SIGNAL LINE
:SURROUND SP. DRIVE SIGNAL LINE
:CENTER SP. DRIVE SIGNAL LINE
9 8 7 6 5 4 3
0.2V 0V -29.7V 29.1V 0V -60.7V
R552 2.2
R553 2.2
14.8V
7.7V
-7.9V
3.3V
5V
-31V
10.4V
2 1
60V 0V 0V
A
B
C
D
E
F