Schematic Diagram-18 - Panasonic SA-AK78 Service Manual

SA-AK78

SCHEMATIC DIAGRAM-18

L
POWER CIRCUIT
IC501
RSN311W64A-P
POWER AMP(HIGH,MID,LOW)
26 25 24
0V 0V
C502 470P
R505 15K
C501 470P
C504 470P
C503 470P
A B
MID/ FL
MID/ FR
K
To MAIN CIRCUIT S.GND
(CN504) S.GND
S.W
on SCHEMATIC
DIAGRAM-17 TW/ SL
TW/ SR
CCH
SUB+B
K
To MAIN CIRCUIT SPCONT
FAN
(CN503)
on SCHEMATIC D.GND
D.GND
DIAGRAM-17
DC DET
HP SW
PCONT
+B(3)
SUB+B
+B(4)
K
To MAIN CIRCUIT +B(5)
(CN506) PCONT
+B(2)
on SCHEMATIC
DIAGRAM-17
/ TUNER
P.GND
-VP
23 22 21 20 19 18
0V 0V -65V 64.6V 0V 0V
R506 R502
15K 3.9K
R501 C508
3.9K
R513
C507
R516
C510
R515
C509
R518
C512
R517
C511
7.5V
Q501
C E D
CP504
1
A
2
3 B
R574
4
100K
5
C
6
7 D
E
8
9
10
14.8V
CP503
1
2
3
4 RVD1SS133TA
5
6
7
8
9
10
M
STABILIZER CIRCUIT
H506
1
2
3
4
5
6
-B
7
8
9
-28.4V -39.2V
10
Q580
2SB621ARSTA -29V
REGULATOR
:NEGATIVE VOLTAGE LINE
:POSITIVE VOLTAGE LINE :CD SIGNAL LINE
17 16 15 14 13 12 11
-32.1V 31.6V 0V 0V 0V 0V
R514
56K
18P R524 120K
56K
18P R523 120K
56K
22P R526 120K
56K
22P R525 150K
56K
22P R528 150K
56K
22P R527 120K
7.5V
Q502
0V
0V
Q501,502
KTC3199GRTA
OVER LOAD DET.
Q506
14.3V
KRA102MTA
14.7V
POWER SUPPLY
14.8V
14.4V
0V
14.4V
14.8V
14.7V
0V
14.3V
Q505
KTC3199GRTA
POWER SUPPLY CONT.
D503
R589 R588 D582 C582
150 4.7K 1D3E 50V100
44
:SUB WOOFER/FRONT LOW SP DRIVE SIGNAL LINE
:SURROUND/HIGHT SP DRIVE SIGNAL LINE
10 9 8 7 6 5 4
0V 0V -31.9V 31.4V 0V
R529
22K
-32.1V
R567
2.2
R568
2.2
C517
0.01
0V
Q503
-0.1V
KTC3199GRTA
SWITCHING
((0V))
Q578
7.7V
KRC102MTA
7.7V
7.7V
POWER SUPPLY
CONT.
7.7V
0V
3.6V
Q577
7.7V
0V
7.7V
0V KRA102MTA
0V
3.6V
POWER SUPPLY
0V
3.6V
((7.7V))
((0V))
3 2 1
-65V 64.6V 0V 0V
31.6V
A
B
C
D
E
F
64.6V
-65V
14.8V
14.8V
14.2V
7.7V
3.3V
-7.7V
0V
R585
0V
1.2K