Daewoo N230S, Service Manual

Page: 28 / 33

27
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 (Point 5)
* If clock does not keep exact time, you must check resistor R15, R16 zener diode ZD1.
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
3. When there is no microwave oscillation
1) When touching START pad, oven lamp does not turn on.
Fan motor does not rotate, but cook indicator in display comes on.
* Cause : RELAY 2 does not operate.
→
refer to Circuit Diagram (Point 3)
- Check method
STATE
POINT
A B
RELAY 2 ON -5VDC GND
RELAY 2 OFF GND -12VDC
STATE
POINT
A B
RELAY 1 ON -5VDC GND
RELAY 1 OFF GND -12VDC
STATE
POINT
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 Replace door open monitor
resistance measurement. switch.
POINT WAVE FORM
A
0V
-5V
T:20ms(50Hz)