Daewoo KOG-371H0S, KOG-373R0S, KOG-374R0S, KOG-375R0S When there is no microwave oscillation

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

	POINT	A	B
STATE
RELAY 2 ON		-5VDC	GND
RELAY 2 OFF		GND	-24VDC

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

	POINT	A	B
STATE
RELAY 1 ON		-5VDC	GND
RELAY 1 OFF		GND	-24VDC

4.When there is no grill oscillation.

✻Cause : RELAY 3 does not operate. → refer to Circuit Diagram (point 6) - Check method

	POINT	A	B
STATE
RELAY 3 ON		-5VDC	GND
RELAY 3 OFF		GND	-24VDC

5. When the door is opened during operation, the count down timer does not stop.

→refer to Circuit Diagram (point 1) - Check method

	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 door open monitor	Replace door open monitor switch.
	switch by resistance measurement.

6.When the digital clock does not operate properly.

→refer to Circuit Diagram (point 5)

POINT

WAVE FORM

A

T: 20 ms(50Hz)

❈If clock does not keep exact time, you must check resistor R7,8,C5.

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