Daewoo KOG-375R0S, KOG-371H0S, KOG-373R0S, KOG-374R0S, KOG-393R0S Condition, Continuity in

(TROUBLE 3) No microwave oscillation even though fan motor rotates.

CONDITION CHECK RESULT CAUSE

No	Check continuity of high	No
microwave	voltage fuse	Continuity
oscillation
	Replace high voltage fuse

REMEDY

	Continuity
Check continuity if high
voltage capacitor terminals
with wires removed

Check continuity of high voltage	Continuity in
rectifier in forward and backward	backward
direction with DC megger	direction
	Continuity
Connect megger leads to
magnetron terminal and
magnetron body
	0 Ω or ∞
Check resistance of primary and
secondary coil of high voltage
transformer
	No
Check continuity of magnetron
	Continuity
with wires removed
	No
Check continuity of filament
	Continuity
terminal of high voltage
transformer
	0 V
Check D.C. voltage being
supplied to RELAY (RY1) coil
	Approx
	15 VDC

Defective high

voltage

transformer

Defective high voltage rectifier

Defective

magnetron

Defective high

voltage

transformer

Defective

magnetron

Defective high

voltage

transformer

Defective touch

control circuit

Faulty

contacts or

RELAY (RY1)

or open

relay coil

Replace

Replace

Replace

Replace

Replace

Replace

Replace

Replace

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