Daewoo CN-150 - Trouble Shooting Charts

11
TROUBLE SHOOTING CHARTS
A
B
A
B
GO TO
YES
DOES RLY1 (RELAY) OPERATE?
NO
NO POWER
GO TO
CHECK
IN/OUT VOLTAGES
OF I801(130VOLT REG)
IN: 150V
DC
OUT: 130V DC
2WATT
4
R413 18K
2WATT
R414 20K
CHECK
DOES
SHUT DOWN
CIRCUIT
OPERATE?
#30
(7.5V
DC )
30
26 23
24
5
4
Q402
H. OUTPUT
T402
F.B.T
CHECK
ALL THE POINTS
THEN CHANGE
I701
CHECK
Q402
COLLECTOR
D405
I701
NORMAL: 5V
RESET: 0V
16.5V
CHECK
16.5V LINE
Q701
RESET
IF #26 NORMAL
& NO OUTPUT AT
#23 THEN
CHANGE I501
CHECK
I801
STR30130
RLY1
RELAY
130V
DC
1
2
23
9
PWR
CONTROL
KEY
KEY OPERATE?
CHECK DIODE
D701 & SWITCH
KEY BOARD
OPEN LOAD
THEN CHECK
#23 ON STATE
4 ~5V
CHECK
Q704 &
RELAY
Q704
POWER
CONTROL
D710
R759
CHECK
LEAD
SOLDERING
L801
LINE FILTER
RLY1
RELAY
CHECK
F801
125V 4A
Q708
REGULATOR
5V
SHOULD
BE
4.3V-5.2V
I501
H.V
SHUT DOWN
OCCURS AT
22VDC