Symphonic ST27S3, Service Manual

Page: 25 / 52

L6609BLP 6-9 6-10
Power Supply Block Diagram
4A/125V
F601
4A/125V
LINE
FILTER
L601
AC601
AC CORD
DEGAUSSING
COIL
DG691
CN691
PS691
BRIDGE
RECTIFIER
D605 - D608
HOT COLD
T601
6
4
2
1 13
14
12
11
9
4
3
IC601
ERROR
VOLTAGE DET
Q601
Q602
LIMITER
SWITCHING
Q662
VR661
+B ADJ
Q676
SWITCHING
CONTROL
Q671
Q681
(SWITCHING)
Q696
RL601
+8V
SWITCHING
MAIN CBA
+B
DEF +B
+5V CTRL2
(FROM PIN 18 OF IC111)
P-ON+8V
DG-ON-H
(FROM PIN74 OF IC111)
+8V CTRL
(FROM PIN40 OF IC111)
AL+33V
P-ON+5V
AL+12V
P-ON+12V
Q111
NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
+B
TP601
10 SWITCHING
Q831
PROTECT-2
(TO PIN 67 OF IC111)
BACK-UP
PROTECT-1
(TO PIN68 OF IC111)
Q682
P-ON+5V
+5V CTRL
(FROM PIN28 OF IC111)
Q683
P-ON+5V
+5V
SWITCHING
+5V
SWITCHING
+5V
SWITCHING
AL+9V
Q321
+9V
SWITCHING
Q675
SWITCHING
P-ON-ON
P-ON-H
(FROM PIN79 OF IC111)
Q832
P-ON+8V
SWITCHING
P-ON-ON
SWITCHING
P-ON-ON
HOT CIRCUIT. BE CAREFUL.
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE 4 A, 125V FUSE. CAUTION:
ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE 4A, 125V.
4A/125V
1
2
FEED
BACK
Q833
SWITCHING
P-ON+8V
CAUTION !
Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit.
If Main Fuse (F601) is blown, check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.