Daewoo KOR-1A1G0A Service Manual page 35

PRINTED CIRCUIT BOARD
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.
- Check method
STATE
RELAY 2 ON
RELAY 2 OFF
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.
- Check method
STATE
RELAY 1 ON
RELAY 1 OFF
4. When the door is opened during operation, the count down timer does not stop.
refer to Circuit Diagram (Point 1)
- Check method
STATE
1) DOOR OPEN
2) DOOR CLOSED
CHECK NO METHOD
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 (Point5)
POINT WAVE FORM
A
* If clock does not keep exact time, you must check resistor R15, 16 zener diodeZD1.
refer to Circuit Diagram (Point 3)
POINT
- 5V DC
refer to Circuit Diagram (Point 2)
POINT
- 5V DC
POINT
CLOSE
T : 16.67 ms (60Hz)
A
GND
A
GND
A
OPEN
REMEDY
Replace secondary interlock switch.
34
B
GND
- 12VDC
B
GND
- 12VDC
B
-5VDC
GND