Daewoo KOR-6N575S, Microwave Oven service manual Troubleshooting Guide

TROUBLESHOOTING GUIDE

Following the procedure below to check if the oven is defective or not.

1.Check grounding before trouble checking.

2.Be careful of the high voltage circuit.

3.Discharge the high voltage capacitor.

4.When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

(TROUBLE 1) Door shut, timer set, but no cooking takes place.

Does the fan motor work when you					YES (Refer to next page)
shut the door and turn the timer?
	NO
		YES				Continuity
Does the			Check continuity of interlock				Replace primary, secondary interlock
fuse blow?			monitor switch with door shut.				switch and interlock monitor switch.
	NO			NO Continuity
						NO
			Replace fuse and check				Replace primary, secondary interlock
			continuity of both interlock				switch and interlock monitor switch.
			switch s contact and monitor
			switch s contact with door
			partially open until monitor
			switch contact.
				Both continuity
						Normal
			Disconnect one side of the				Replace high voltage capacitor
			lead wire connected from				and high voltage diode.
			transformer to the high
			voltage capacitor, and operate
			oven.
					Fuse again
							Replace high voltage transformer

If outlet has proper voltage, check continuity of power supply cord.

NO Continuity

Replace power supply cord.

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