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

CONDITION

 

CHECK

 

RESULT

 

CAUSE

 

 

 

 

 

 

 

REMEDY

No

microwave oscillation

Continuity

Check continuity of high

voltage fuse

Replace high voltage fuse

 

 

 

 

Continuity

Check continuity of 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 mag-

 

 

 

 

 

 

 

 

 

 

 

netron terminal and magnetron

 

 

 

 

body

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 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 termi-

 

 

 

 

 

 

Continuity

nal of high voltage transformer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 V

Check D.C. voltage being sup-

 

 

 

 

 

 

 

 

 

 

 

plied to RELAY (RY1) coil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Approx

 

 

 

 

 

 

 

 

 

 

15 VDC

 

 

 

 

 

 

Defective high voltage trans- former

Defective high voltage rectifier

Defective mag-

netron

Defective high voltage trans- former

Defective mag-

netron

Defective high voltage trans- former

Defective touch

control circuit

Faulty

contacts or

RELAY (RY1)

or open

relay coil

Replace

Replace

Replace

Replace

Replace

Replace

Replace

Replace

19

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Daewoo KOR-63FB0S, KOR-63FB9S, KOR-63DB9S, KOR-63DB0S service manual Check Result Cause Remedy, Relay RY1

KOR-63DB0S, KOR-63DB9S, KOR-63FB9S, KOR-63FB0S specifications

Daewoo, a well-established brand known for its innovative home appliances, has made waves in the microwave oven market with its models KOR-63FB0S, KOR-63FB9S, KOR-63DB9S, and KOR-63DB0S. These models exemplify a commitment to both functionality and modern design while incorporating advanced technologies to enhance the cooking experience.

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