Does the fan motor work when you shut the door and turn the timer?

YES

Does the oven lamp light? NO

Does the turntable turn?

YES

Normal reading should be approx. 0

Replace or repair oven lamp, turntable motor.

If microwave do not oscillate, check continuity of filament of magnetron.

Poor continuity

NO Continuity

Check continuity

filament tap (3.3V)

of high voltage transformer.

Continuity

Check continuity filament tap (3.3V)

of high voltage transformer.

Continuity

No Continuity

Continuity in the reverse direction.

Replace high voltage transformer

Replace high voltage diode

Replace magnetron

Meter with 600V or higher voltage Meger should

be used to check the normal direction resistance of

the diode

Check the isolation of filament winding of high voltage transformer.

Good

NO Continuity

Replace high voltage transformer.

Replace magnetron

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Daewoo Microwave Oven, KOR-6N575S service manual Yes