(TROUBLE 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

 

CAUSE

 

 

REMEDY

 

 

 

 

 

 

 

 

Defective

 

 

Replace

secondary switch.

 

 

secondary switch.

 

 

 

 

Defective PCB

 

 

Replace PCB

assembly.

 

 

assembly.

 

 

 

 

and PCB

 

No continuity

assembly.

 

 

 

Loose connection.

Connect them tightly.

2.Fan motor or Check fan motor. oven lamp do

not turn on.

 

Check oven lamp.

 

Abnormal

Abnormal

Defective fan motor.

Defective oven lamp.

Replace fan motor.

Replace oven lamp.

Normal

(TROUBLE 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

 

 

 

rating voltage.

 

power source

 

 

 

 

 

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 PCB assembly.

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

Replace PCB assembly.

Measure the

Abnormal

Defective

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.

5-14

Page 36
Image 36
Goldstar MA-2005ST service manual Condition Check