Panasonic SA-AK78 Service Manual page 44

SA-AK78
SCHEMATIC DIAGRAM-18
L
POWER CIRCUIT
IC501
RSN311W64A-P
POWER AMP(HIGH,MID,LOW)
26 25 24
0V 0V
R506
15K
C502 470P
R505 15K
C501 470P
C504 470P
C503 470P
A B
MID/ FL
MID/ FR
K
To MAIN CIRCUIT S.GND
S.GND
(CN504)
on SCHEMATIC S.W
TW/ SL
DIAGRAM-17
TW/ SR
CCH
SUB+B
K
To MAIN CIRCUIT SPCONT
(CN503) FAN
D.GND
on SCHEMATIC
DIAGRAM-17 D.GND
DC DET
HP SW
PCONT
+B(3)
SUB+B
+B(4)
K
To MAIN CIRCUIT +B(5)
(CN506) PCONT
+B(2)
on SCHEMATIC
-B
DIAGRAM-17
/ TUNER
P.GND
-VP
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:NEGATIVE VOLTAGE LINE
:POSITIVE VOLTAGE LINE
23 22 21 20 19 18 17
0V 0V -65V 64.6V 0V 0V
R502 R514
3.9K 56K
R501 C508 18P R524
3.9K
R513 56K
C507 18P
R516 56K
C510 22P R526
R515 56K
C509 22P R525
R518 56K
C512 22P
R517 56K
C511 22P R527
7.5V
Q502
7.5V
0V
Q501
Q501,502
KTC3199GRTA
C E D
OVER LOAD DET.
14.3V
14.7V
14.8V
14.4V
CP504
1
2 A
B
3
R574
4
100K
5
C
6
D
7
E
8
9
10 14.8V
CP503
1
2
3
D503
4 RVD1SS133TA
5
6
7
8
9
10
M
STABILIZER CIRCUIT
H506
1
2
3
4
5
6
7
8
9
-28.4V -39.2V
10
Q580
R589
2SB621ARSTA -29V
150
REGULATOR
:CD SIGNAL LINE
16 15 14 13 12 11 10 9
-32.1V 31.6V 0V 0V 0V 0V
R529
22K
120K
R523 120K
120K
150K
R528 150K
120K
0V
Q506
KRA102MTA
POWER SUPPLY
0V
14.4V
14.8V
14.7V
-0.1V
0V
14.3V
Q505
KTC3199GRTA
POWER SUPPLY CONT.
Q578
KRC102MTA
POWER SUPPLY
CONT.
R588 D582 C582
4.7K 1D3E 50V100
3.6V
0V
0V
3.6V
3.6V
((0V))
44
:SUB WOOFER/FRONT LOW SP DRIVE SIGNAL LINE
:SURROUND/HIGHT SP DRIVE SIGNAL LINE
8 7 6 5 4 3 2
0V 0V -31.9V 31.4V 0V -65V 64.6V 0V
-32.1V
R567
2.2
R568
2.2
C517
0.01
64.6V
0V
Q503
KTC3199GRTA
SWITCHING
-65V
14.8V
14.2V
-7.7V
((0V))
7.7V
7.7V
7.7V
0V
R585
0V
1.2K
7.7V
0V
Q577
7.7V
7.7V
KRA102MTA
0V
POWER SUPPLY
0V
((7.7V))
1
0V
31.6V
A
B
C
D
E
F
14.8V
7.7V
3.3V