Daewoo KOR-631Q2A, Service Manual, Page: 28 / 33

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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 R21, R34, C2.
STATE
POINT
A B
RELAY 1 ON -5 VDC GND
RELAY 1 OFF GND -24 VDC
STATE
POINT
A B C
RELAY 2 ON -2.5 VDC -23.3 VDC -24 VDC
RELAY 2 OFF GND -29 VDC GND
STATE
POINT
A B
1) DOOR OPEN OPEN -5 VDC
2) DOOR CLOSED CLOSE GND
CHECK NO METHOD REMEDY
1 Check the stage (ON, OFF) of the door open monitor switch by Replace door open monitor
resistance measurement. switch.
POINT WAVE FORM
A
T:16.7ms(60Hz)