Trouble Shooting Charts - Daewoo DTQ-14N2FC Service Manual

TROUBLE SHOOTING CHARTS

NO POWER
DOES Q701(POWER ON/OFF TR)
A
CHECK
IN/OUT VOLTAGES
OF IC801(130VOLT REG)
IN: 150V
DC
OUT: 130V
DC
CHECK TP7
(MAIN B+
LINE)
B
SHOULD
BE
4.3V-5.2V
5V
Q802
REGULATOR
CHECK
F801
125V 4A
CHECK
LEAD
SOLDERING
OPERATE?
R816 15K
2WATT
103V
DC
IF #26 NORMAL
& NO OUTPUT AT
#23 THEN
CHANGE IC501
12V
CHECK
12V LINE
Q706
RESET
16
12
R808
T801
L801
LINE FILTER
YES
NO
CHECK
#30
(7.5V )
DC
30
26
Q402
H. OUTPUT
D406
D403
NORMAL: 5V
RESET: 0V
IC701
36
42
LC864616A
OPEN LOAD
THEN CHECK
#42 ON STATE
4 ~5V
Q701
POWER
CONTROL
14
A
GO TO
B
GO TO
DOES
SHUT DOWN
CIRCUIT
OPERATE?
24
CHECK
Q402
COLLECTOR
T402
F.B.T
5
4 4
CHECK
ALL THE POINTS
THEN CHANGE
IC701
PWR
CONTROL
KEY
KEY OPERATE?
CHECK DIODE
D701 & SWITCH
KEY BOARD