Panasonic SA-AK58 Service Manual page 135

SCHEMATIC DIAGRAM-18
M
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
R508 R513
4.7K 4.7K
R507 R517
4.7K 4.7K
F E D
C509
0.01
CP501
GND
1
+B(14V)
2
Lch IN 3
Rch IN
4
B
To MAIN
LOW IN
5
(CONTROL)
GND 6
CIRCUIT(CN300)
S IN
7
on SCHEMATIC
C IN
8
DIAGRAM-17
/ CD
9
DC DET
10
P.CNT
11
HP SW
12
CP500
P.GND
1
D.GND
2
+B(7.5V)
3
-B(-7.5V) 4
B
To MAIN
NC
5
(CONTROL)
NC
6
CIRCUIT(CN301)
CD7.5V 7
on SCHEMATIC
CD3.3V
8
DIAGRAM-17
SW5V
9
-VP 10
11
LED9V
12
+B(10V)
:NEGATIVE VOLTAGE LINE
:POSITIVE VOLTAGE LINE
21 20 19 18 17 16
0V -58V 58V 0V 0V -28V
R552
2.2
R553
2.2
R505 2.7K R532 56K
C526 15P
R506 2.7K R533 56K
C527 15P
R534 56K
C528 15P
R535 56K
C529 15P
R536 56K
C530 22P
R537 56K
C531 22P
Q505
B C A KTC3199GRTA
OVER LOAD DET.
5.3V
5.3V
0V
Q503
2SC2785FTA
OVER LOAD DET.
A
B
C
D
E
F
A
B
D501 D502 D503
1D3E RL1N4003S-P RL1N4003S-P
7.4V
:CD SIGNAL LINE
15 14 13 12 11 10 9
28V -0.2V 0V 0V 0.2V
28V
-28V
58V
-58V
R555 120K
R560 120K
R557 120K
R558 150K
R556 220K
R559 180K
0V
R554
1K
0V
7.5V
-7.5V
3.2V
4.9V
-28.5V
10V
:CENTER SP. DRIVE SIGNAL LINE
:SURROUND SP. DRIVE SIGNAL LINE
8 7 6 5 4 3 2
0V -28V 28V 0V -58V 58V 0V
0.2V
Q510
2SD2144STA
SWITCHING
1
0V
A
B
C
D
E
F