LG / GOLDSTAR MH745HD
Service Manual

(TROUBLE 2) Oven does not at all even thought MOTOR and P.C.B program.
CONDITION CAUSE TEST PROCEDURE OR CORRECTION

No input can be programmed.

Defective tact switch key of P.C.B.

Test procedure tact switch key of P.C.B.

Some inputs can not be programmed.

Loose connection.

Connect them tightly.

Display shows a number or figure different from one touched.

Incorrect touch key.

Touch key again after closing.

Random programming when pressing other than touch keys.

Display fixes some figure and can not accept any input.

Set time does not count down when touched START.

Defective secondary switch or out of adjustment

Test procedure secondary switch.

Defective tact switch key of P.C.B.

Test procedure tact switch key of P.C.B.

Loose connection.

Test tact switch key of P.C.B.

H.M.MOTOR not operating.

¥ Loose PCB connector No. CN6 and H.M.M S/W1, S/W2 ¥ Loose Gear of H.M.MOTOR

¥ To Fasten PCB CN6. ¥ To check H.M.MOTOR S/W1, S/W2 ¥ To Adjust Gear of H.M.MOTOR

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