Daewoo KOR-1A1G0A, Service Manual

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34
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 (Point5)
POINT
STATE
A B
RELAY 2
ON - 5V DC GND
RELAY 2
OFF GND - 12VDC
POINT
STATE
A B
RELAY 1 ON - 5V DC GND
RELAY 1 OFF GND - 12VDC
POINT
STATE
A B
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 switch
by resistance measurement. Replace secondary interlock switch.
POINT WAVE FORM
A
PRINTED CIRCUIT BOARD
* If clock does not keep exact time, you must check resistor R15, 16 zener diodeZD1.
T : 16.67 ms (60Hz)