Daewoo DTQ-26S1FC Service Manual page 17

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TROUBLE SHOOTING CHARTS
NO POWER
DOES QC701(POWER ON/OFF TR)
OPERATE?
A
CHECK TP10
(MAIN B+
LINE)
B
SHOULD
BE
4.3V-5.2V
5V
Q802
REGULATOR
CHECK
F801
125V 5A
CHECK
LEAD
SOLDERING
R816 15K
2WATT
103V
DC
IF #26 NORMAL
& NO OUTPUT AT
#23 THEN
CHANGE I501
12V
CHECK
12V LINE
NORMAL: 5V
RESET: 0V
QC706
RESET
16 I701
12
LC864616A
R808
T801
L801
LINE FILTER
12
YES
GO TO
NO
GO TO
CHECK
#30
(7.5V )
DC
30
I501
24
26
Q402
H. OUTPUT
D406
T402
12V
F.B.T
D403 103V(B+)
PWR
36
CONTROL
KEY
42
OPEN LOAD
THEN CHECK
#42 ON STATE
4 ~5V
QC701
POWER
CONTROL
A
B
DOES
SHUT DOWN
CIRCUIT
OPERATE?
CHECK
Q402
COLLECTOR
CHECK
ALL THE POINTS
THEN CHANGE
I701
KEY OPERATE?
CHECK DIODE
D701 & SWITCH
KEY BOARD