Daewoo KOR-6L5K5S Service Manual page 29

3. When there is no microwave oscillation
1) When pressing START button, 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 pressing START button, 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
DOOR OPEN
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
5V
IC 1 PIN 8
0V
*If clock does not keep exact time, you must check resistor R20, R19, D11, C6 and zener diode ZD2.
POINT
POINT
POINT
METHOD
WAVE FORM
T:20ms(50Hz)
T
28
A
5V DC
GND
A
5V DC
GND
A
OPEN
CLOSE
Replace door open monitor swith.
B
GND
15V DC
B
GND
15V DC
B
+5V DC
GND
REMEDY