Daewoo KOC-1B0K0S service manual Trouble Shooting Guide

8. TROUBLE SHOOTING GUIDE

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

1.Check grounding before checking trouble.

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 then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet. Check wire harness, wiring, and connected of the terminals and power cord before check parts listed below.

TROUBLE 1) Oven does not operate at all; inputs can not be accepted.

CONDITION		CHECK		RESULT
Fuse blows	Check continuity of			Continuity
	interlock monitor switch
				(COM	NC)
	with door closed
	( COM		NC )
				No continuity
	Check continuity of			No
	both primary and			Continuity
	secondary interlock
	switch with door closed
				Continuity

CAUSE

Malfunction Of Interlock monitor switch

Malfunction Of interlock switch

REMEDY

Replace

Replace

Check continuity of primary interlock switch contact with door partially open until

interlock monitor switch contact close ( COM NC close )

Continuity

Shorted contacts of Primary Interlock switch

Replace

Check continuity of Primary winding of low voltage transformer

0- or infinite

Approx.

530

( normal )

Defective Low voltage transformer

Replace

Disconnect high voltage	Fuse again
Fuse and operate the unit	blows

Defective high voltage transformer

Replace

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