Daewoo KOR-6L4B5S69 Service Manual page 29

3. When there is no microwave oscillation
1) When touching the START pad, oven lamp does not turn on.
Fan motor does not rotate, but cook indicator in display comes on.
- Check method
STATE
RELAY 2 ON
RELAY 2 OFF
2) When touching the START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
- Check method
STATE
RELAY 1 ON
RELAY 1 OFF
4. When the door is opened during operation, the count down timer does not stop.
-Check method
STATE
1) DOOR OPEN
2) DOOR CLOSED
CHECK NO
1 Check the stage (ON, OFF) of the door open monitor switch by
resistance measurement.
5. When the digital clock does not operate properly .
Refer to Circuit Diagram.
POINT
IC 1 PIN 8
* If clock does not keep exact time, you must check resistor R12, R17, D8, C3 and zener diode ZD1.
POINT
POINT
POINT
METHOD
WAVE FORM
28
A
5VDC
GND
A
5VDC
GND
A
OPEN
CLOSE
T:20ms(50Hz)
T:16.67ms(60Hz)
B
GND
15VDC
B
GND
15VDC
B
5VDC
GND
REMEDY
Replace door open monitor
switch.