(PROBLEM 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched.

CONDITION

CHECK

RESULT

1.Setting time

Check continuity

No continuity.

does not count

of secondary

 

down when

switch (with

 

touching START

door closed).

Continuity.

pad.

 

 

 

 

Check the con-

Continuity

 

nection between

 

 

CN1 connector

 

 

and P.C.B

No continuity

 

assembly.

 

CAUSE

Defective secondary switch.

Defective P.C.B assembly.

Loose connection.

REMEDY

Replace secondary switch.

Replace P.C.B assembly.

Connect them tightly.

2.Fan motor or oven lamp do not turn on.

Check fan motor.

Check oven lamp.

Abnormal.

Abnormal.

Normal.

Defective fan motor.

Defective oven lamp.

Replace fan motor.

Replace oven lamp.

(PROBLEM 4) Oven seems to be operating but little heat is produced in oven load.

CONDITION

 

CHECK

 

RESULT

 

CAUSE

 

 

 

 

 

 

 

REMEDY

Output is low.

Check the

 

 

Lower than 90% of

 

power source

 

 

rating voltage.

 

voltage.

 

 

 

 

 

 

 

 

 

 

 

 

Normal.

Disconnect the

Abnormal.

wire leads from

 

relay 2 and

 

check on and off

Normal.

time with

 

multitester.

 

Decrease in power source voltage with load.

Defective P.C.B assembly.

Suggest customer contact local electric power utility co. or qualified electrician.

Replace P.C.B assembly.

Measure the

 

 

 

 

 

 

 

 

 

 

 

 

Defective

 

Abnormal.

 

output power.

 

 

 

 

magnetron.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace magnetron.

NOTE: Simple test of power output-conducted by heating one liter water for one min. if available. Minimum 8.5˚C temperature rise is normal condition.

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Image 25
GE LMAB1240ST service manual Condition Check

LMAB1240ST specifications

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