Daewoo KOT-1G1A, Service Manual, Page: 44 / 58

43
MEASURE POINT
4) When there is no microwave oscillation
When touching START pad, oven lamp does not turn on.
Fan motor does not rotate, but cook indicator in display comes on.
*Cause: RELAY 1,2,4 does not operate. -> refer to Circuit Diagram (point 2,3,4)
- CHECK METHOD
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
STAGE POINT
RELAY 2,4,5 ON
RELAY 2,4,5 OFF
A
+5VDC
GND
B
GND
+15VDC
STAGE POINT
RELAY 1 ON
RELAY 1 OFF
A
+5VDC
GND
B
GND
+15VDC
5)When the door is opened during operation, the Count down timer does not stop. -> refer to Circuit Diagram (point 1)
- CHECK METHOD
6) When the digital clock does not operate properly. -> refer to Circuit Diagram (point 6)
- CHECK METHOD
If clock does not keep exact time, you must check D15, R25, R24, ZD2, C6.
STAGE POINT
1) DOOR OPEN
2) DOOR CLOSED
A
OPEN
CLOSED
B
+5VDC
GND
CHECK NO. A B
1
Check the stage (ON, OFF) of the secondary interlock Replace secondary interlock switch.
switch by resistance measurement.
POINT WAVE FORM
A
B
T: 16.67 ms (60 Hz)
T: 16.67 ms (60 Hz)