(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly)

CONDITION

No microwave oscillation.

CHECK

RESULT

Disconnect the

No continuity.

wire leads from

 

relay 2 and

 

check continuity

Continuity.

of relay 2.

 

(Operate the unit)

 

Check high vol-

Abnormal

tage transformer

 

Normal

CAUSE

Defective PCB assembly

Defective high voltage transformer.

REMEDY

Replace PCB assembly

Replace high voltage transformer.

Check high vol-

Abnormal

Defective high

tage capacitor

voltage capacitor.

 

 

Normal

 

Check high vol-

Abnormal

Defective high

tage diode

voltage diode.

 

 

Normal

 

Check

Abnormal

Defective

magnetron.

magnetron.

 

Replace high voltage capacitor.

Replace high voltage diode.

Replace magnetron.

NOTE : • Make sure the wire leads correct position.

When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.

When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition.

Output is full power when you set lower power level.

Disconnect the wire leads from relay 2 and check continuity relay 2. (Operate the unit)

Abnormal.

Defective PCB assembly.

Replace PCB assembly.

LGE Internal Use Only

5-15

Copyright © 2007 LG Electronics. Inc. All right reserved.

 

 

Only for training and service purposes

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Image 25
LG Electronics MS3447GR Defective PCB assembly Defective high voltage transformer, Abnormal Defective PCB assembly

MS3447GR, MS3447GRS specifications

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