Daewoo KOR-1N4A9W, Service Manual, Page: 28 / 34

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3. When there is no microwave oscillation
1) When touching START pad, oven lamp does not turn on.
Fan motor does not rotate, but cook indicator in display comes on.
2) When touching START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
4. When the door is opened during operation, the count down timer does not stop.
5. When the digital clock does not operate properly.
→
refer to Circuit Diagram
*If clock does not keep exact time, you must check resistor R12, R17, D8, C3 and zener diode ZD1.
POINT
A B
STATE
RELAY 2 ON GND 5V DC
RELAY 2 OFF 15V DC GND
POINT
A B
STATE
1) DOOR OPEN OPEN 5VDC
2) DOOR CLOSED CLOSE GND
CHECK NO METHOD REMEDY
1 Check the stage(ON, OFF) of the door open monitor Replace door open monitor switch.
switch by resistance measurement.
POINT WAVE FORM
IC 1 PIN 8
T:20ms(50Hz)
- Check method
POINT
A B
STATE
RELAY 1 ON GND 5V DC
RELAY 1 OFF 15V DC GND
- Check method
- Check method