Power Supply Circuit - Technics SH-DV290EG Service Manual

2 1
V 0V 0V
B A
0 31
7.6V
Q556
2SC5398RSTA
SWITCHING
4.7V 0.5V FAN ON:0V
R570
0V
2.2M
C552 R559
0.01 4.7K
-10.4V
-10.4V
0.3V
R591
4.7K
Q551
2SA1995RSTA
SIGNAL LEVEL DET.
Q704
R796
2.2
7.6V 30.1V
8.1V
Q703,704
2SD2137PQTA
REGULATOR
Q703
R797
2.2
7.6V 30.1V
R729
8.1V
220
14.7V
-10.4V
10.4V
C639
1000P
E601
C640
1000P
Q711,712
2SB1548PQAU
REGULATOR
C641
1000P
Q712
C642
1000P
C732
0.022
R768
100
C647
1000P
E602
32
FAN ON:0V
0.5V
Q557
7.6V
2SA1995RSTA
MOTOR DRIVE
-10.4V
R558
Q555
2.2K
2SD2144STA
SIGNAL LEVEL DET.
D552
MA165TA MA4100MTA
R561
100K
A
B
C
D
E
F
G
R769 R767
27 27
CN781
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
W701B
R754
0.47
10.4V 14.1V
13.6V
Q711
10.4V 14.1V
13.6V
13.6V
10.2V
Q725
9.6V
2SC5398RSTA
STABILIZER
33 34
R566
68K
R568 C556
100 16V10
0V
Q554
2SA1995RSTA
SIGNAL LEVEL DET.
D555
7.6V
7V
0V
C559
0.01
7.6V
0V
Q553
6.8V
2SD2144STA
FAN ON:1.6V
MOTOR DRIVE
R722
2.2
10
C

POWER SUPPLY CIRCUIT

10
29.2V
Q702
2SB1548PQAU
Q701
REGULATOR
2SD2374PQAU
REGULATOR
-10.4V -30.1V
14.7V
-11V
15.2V
-11V
-0.6V
Q705
2SA1995RSTA
STABILIZER
SA-DV290(E,EB,EG) MAIN,POWER SUPPLY CIRCUIT DIAGRAM
35
FAN MOTOR
M
1 2
JK551
29.2V
R725
10
36