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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. refer to Circuit Diagram ( Point 3)
- Check method
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
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 R15,16, zener diodeZD1.
POINT
STATE
A B
RELAY 2
ON - 5VDC GND
RELAY 2
OFF GND - 12VDC
POINT
STATE
A B
RELAY 1
ON -5VDC GND
RELAY 1
OFF GND -12VDC
POINT
STATE
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 resistance
measurement.
Replace door open monitor switch.
POINT WAVE FORM
A T: 16.67ms(60Hz)