Daewoo KOG-6CDB5S, Service Manual, Page: 30 / 36

3. When there is no microwave oscillation
1) When touching START pad, oven lamp does not turn on.
Fan motor do not rotate, but cook indicator in display comes on.
Cause : RELAY 2 does not operate. refer to Circuit Diagram (point 3)
- Check method
2) When touching START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
Cause : RELAY 1 does not operate. refer to Circuit Diagram (point 2)
- Check method
4. When there is no grill oscillation.
Cause : RELAY 3 does not operate. refer to Circuit Diagram (point 6)
- Check method
5. When the door is opened during operation, the count down timer does not stop.
refer to Circuit Diagram (point 1)
- Check method
6. When the digital clock does not operate properly.
refer to Circuit Diagram (point 5)
POINT
A B
STATE
RELAY 2 ON 5VDC GND
RELAY 2 OFF GND -12VDC
POINT
A B
STATE
RELAY 1 ON 5VDC GND
RELAY 1 OFF GND 12VDC
POINT
A B
STATE
RELAY 3 ON 5VDC GND
RELAY 3 OFF GND 12VDC
POINT
A B
STATE
1) DOOR OPEN OPEN 5VDC
2) DOOR CLOSED CLOSE GND
CHECK NO HETHOD REMEDY
1 Check the stage(ON, OFF) of the door open monitor Replace door open monitor switch.
switch by resistance measurement.
POINT WAVE FORM
A
T: 20 ms(50Hz)
If clock does not keep
exact time, you must
check resistor R19, 20,
zener diode ZD2.
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