Turbo Air TMW-1100E, Service Manual, Page: 38 / 66

36
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 rotates 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 R26,19, transistor Q6.
POINT
A B
STATE
RELAY 2 ON 5VDC GND
RELAY 2 OFF GND 12VDC
POINT
A B
STATE
RELAY 1 ON 5VDC GND
RELAY 1 OFF GND 12VDC
POINT
A B
STATE
1) DOOR OPEN OPEN 5VDC
2) DOOR CLOSED CLOSE GND
CHECK NO HETHOD REMEDY
1 Check the stage(ON, OFF) of the secondary interlock Replace door open monitor switch.
switch by resistance measurement.
POINT WAVE FORM
A
5V
0V
T: 16.67 ms(60Hz)