Daewoo KOC-154K Service Manual download pdf (Page 22)

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

CONDITION CHECK RESULT

Check continuity of

high voltage capacitor terminals

with wires removed

Continuity

CAUSE

Defective

high voltage

transformer

Defective

high voltage

fuse

REMEDY

Replace

microwave

oscillation

Check continuity of

high voltage rectifier in forward

and backward

direction with DC megger

Continuity

in backward

direction

Defective high

voltage rectifier

Replace

Connect megger leads to

magnetron terminal and

magnetron body

Continuity

Defective

magnetron

Check resistance of primary

and secondary coil of high

voltage transformer

Defective

high voltage

transformer

Replace

Check continuity of

high voltage fuse

No microwave oscillation

continuity

Check continuity of

magnetron heater with wires

removed

No continuity

Defective

magnetron

Replace

Check continuity of filament

terminal of high voltage

transformer

No continuity

Defective high

voltage

transformer

Replace

Check D.C voltage

being supplied to

RELAY (RY1) coil

0 V

Defective

touch control

circuit

Replace

Approx.

24V DC

Faulty contacts of

RELAY

(RY1) or open

relay coil

Replace

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Daewoo KOC-154K Service Manual Page 22

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