28
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.
2) When pressing
START
button, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
4. When the door is opened during operation, the count down timer does not stop.
5. When the digital clock does not operate properly.
→
refer to Circuit Diagram
- Check method
- Check method
- Check method
RELAY 2
ON
5V DC
GND
RELAY 2
OFF
GND
15V DC
POINT
A
B
STATE
RELAY 1
ON
5V DC
GND
RELAY 1
OFF
GND
15V DC
POINT
A
B
STATE
DOOR OPEN
OPEN
+5V DC
DOOR CLOSED
CLOSE
GND
POINT
A
B
STATE
1
Check the stage(ON,OFF) of the door open
Replace door open monitor swith.
monitor switch by resistance measurement.
CHECK NO
METHOD
REMEDY
*If clock does not keep exact time, you must check resistor R20, R19, D11, C6 and zener diode ZD2.
POINT
WAVE FORM
IC 1 PIN 8
T
T:20ms(50Hz)
5V
0V
