Daewoo DSC-3220E/3220L - Manual (Page 68)

Service manual SC-150
-67-
2
4 3
DRAIN
I801 M
O
F
S
ET
AND
CONTROL
IC
1
MAIN
AC
VOLTAGE
I804 OPTO COUPLER
I823
3.3V
REGULATOR
I703
IR
RECEIVER
FRONT MAS
K
BUTTONS
I810 CONTROLLED RECTIFIER S
W
ITCHING
CIRCUIT
T
801
SM
P
S
T
R
A
N
S
I501 MAIN IC
OCP FB
D801...D804 GRAETZ BRIDGE
16
D821 I810 controlled
rectifier
HIGH
C841
C840
R713
1
3
1
2
61 64 56 54
7
63
CONDUCTING
IR
IN
com
supply voltage
KEY
IN
POWER
R888
C888
Q809
Q810
Q811 D811
D825 R810
L801
D806
C808
SW801 P
O
WER
SWITCH
C850
R806
8
4 3
1 2
R870
HIGH
LOW
LOW
CONDUCTING CONDUCTING
AROUND 6V
d
c
AROUND 3.3Vdc
Fig
:
Power
supply
operation
in
stand
-
by
mode