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Service manual SC-150
-67-
2
4
3
DRAIN
I801
MOFSET AND
CONTROL IC
1
MAIN AC VOLTAGE
I804
OPTO
COUPLER
I823 3.3V
REGULATOR
I703 IR
RECEIVER
FRONT
MASK
BUTTONS
I810
CONTROLLED
RECTIFIER
SWITCHING
CIRCUIT
T801 SM PS TRANS
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
POWER SWITCH
C850
R806
8
4
3
1
2
R870
HIGH
LOW
LOW
CONDUCTING
CONDUCTING
AROUND
6Vdc
AROUND
3.3Vdc
Fig : Power supply operation in stand - by mode