Daewoo KOG-370A0P Service Manual page 30

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. ¡ æ refer to Circuit Diagram ( Point 3)
- 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. ¡ æ refer to Circuit Diagram ( Point 2 )
- Check method
STATE
RELAY 1 ON
RELAY 1 OFF
4. When there is no grill oscillation.
* Cause :RELAY3 does not operate ¡ æ refer to circuit Diagram (point 6)
- Check method
STATE
RELAY3 ON
RELAY3 OFF
5. When the door is opened during operation, the count down timer does not stop.
¡ æ refer to Circuit Diagram( Point 1 )
- Check method
STATE
1) DOOR OPEN
2) DOOR CLOSED
CHECK NO
Check the stage(ON,OFF) of the door open monitor switch by resistance
1
measurement.
6. When the digital clock does not operate properly.
¡ æ refer to Circuit Diagram( Point 5 )
POINT
A
¡ Ø If clock does not keep exact time, you must check resistor R15,16, zener diodeZD1.
POINT
POINT
POINT
POINT
METHOD
T: 16.67 ms(60Hz)
A
- 5VDC
GND
A
-5VDC
GND
A
-5VDC
GND
A
OPEN
CLOSE
WAVE FORM
29
PRINTED CIRCUIT BOARD
B
GND
- 12VDC
B
GND
-12VDC
B
GND
-12VDC
B
-5VDC
GND
REMEDY
Replace door open monitor switch.