(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
1.Setting time does not count down when touching START pad.
CHECK
Check continuity of secondary switch (with door closed).
RESULT
No continuity.
Continuity.
CAUSE
Defective secondary switch.
REMEDY
Replace secondary switch.
| Check the con- | Continuity |
| nection between | |
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| CN1 connector |
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| and PCB | No continuity |
| assembly. | |
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2. Fan motor or | Check fan motor. | Abnormal |
oven lamp do |
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not turn on. | Check oven lamp. | Abnormal |
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| Normal |
Defective PCB assembly.
Loose connection.
Defective fan motor. 
Defective oven lamp. 
Replace PCB assembly.
Connection then tightly.
Replace fan motor.
Defective oven lamp.
(TROUBLE 4) Oven seems to be operation but little heat is produced in oven load.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output is low.
Check the |
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| Lower than 90% of |
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| rating voltage. |
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power source |
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voltage. |
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| Normal. | |
Disconnect the | Abnormal. | |
wire leads from | ||
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relay 2 and |
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check on and off | Normal. | |
time with | ||
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multitester. |
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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