Daewoo KOR-180A0A - Manual (Page 29)

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 the door is opened during operation the count down timer does not stop.
refer to Circuit Diagram (point 1)
- Check method
5. When the digital clock does not operate properly.
refer to Circuit Diagram (point 5)
If clock does not keep exact time, you must check resistor R15,16, zener diode ZD1.
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
1) DOOR OPEN OPEN -5VDC
2) DOOR CLOSED CLOSE GND
CHECK NO HETHOD REMEDY
1 Check the stage(ON, OFF) of the secondary interlock Replace door open monitor switch.
switch by resistance measurement.
POINT WAVE FORM
A
T: 16.67 ms(60Hz)
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