Sylvania 6626LDG A, Service Manual, Page: 31 / 74

9-5
Power Supply Block Diagram
L4350BLP
F601 4A/125V
LINE FIL
TER
L601
A
C
601
A
C
CORD
HO
T
COLD
T601
15 10 13 14 11 1
4 3
2
Q603
LIMIT
MAIN CB
A
5 6
HOT CIRCUIT. BE CAREFUL.
LINE FIL
T
ER
L602
INV+24V +12V
CN111
D504
Q531, Q801, Q803
D542
Q534
Q533
Q535
Q502
T
O
SYSTEM
CONTR
OL
BLOCK DIA
GRAM
BRIDGE RECTIFIER
D601 - D604
Q601
SWITCHING
IC531
+2.5V REG
IC533
+1.8V REG
IC536
+5V REG
IC532
+1.2V REG
BRIDGE RECTIFIER
D638 - D641
3 2
Q602
IC601 IC602
SWITCHING
CONTR
O
L
1
4 3
2
IC631
4 3 7
12
T631
7
12 11
8
3 5 6 1
9
Q501
Q536
Q504
Q537
A
U
DIO+B
SHUNT
REG
A
UDIO+B REG.
SHUNT
REG
10
SWITCHING
Q631
P-ON-H
+3.3V
10
+1.2V
16-18
LCD+5V
6,7
+5V
4
+33V
1
STBY+3.3V
2
+2.5V
12,13
+1.8V
19
T
O
SYSTEM
CONTR
OL
BLOCK DIA
GRAM
IC537
+3.3V REG
IC535
+3.3V
REG
IC534
+5V REG
2 1
Q632 SWITCHING
CONTR
O
L
TO DIGIT
AL
MAIN CBA UNIT (CN1111)
PR
O
TECT1
TO SYSTEM CONTR
OL
BLOCK DIA
GRAM
4A 125V
EV+1.2V
44 EV+1.2V
55 EV+3.3V
66 EV+3.3V
77
CN911
C
N401
EV+1.2V EV+3.3V D
VD-ON+3.3V
D
VD-ON+5V
EV+9V EV+3.3V
EV+3.3V
88 D
VD-ON+5V
10
10
EV+10V
11
11
EV+10V
12
12
EV+3.3V(TV)
11
D
V
D-MAIN-PO
WER
D
V
D-PR
O
TECT
IC911
+1.2V REG.
Q914
Q912
Q913
Q915
Q916
Q917
PWRCON
D
VD MAIN CB
A UNIT
D
VD-ON+3.3V
99
Q911
Q918
T
O
SYSTEM
CONTR
O
L / SER
V
O
BLOCK DIA
GRAM
<D
VD SECTION>
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.
For continued protection against risk of fire, replace only with same type 4 A, 125V fuse.
CAUTION ! : ATTENTION :
Utiliser un fusible de rechange de m
ê
me type de 4A, 125V.
4A/125V
NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal.