(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 |
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touching START | door closed). | Continuity. |
pad. |
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| Check the con- | Continuity |
| nection between | |
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| CN1 connector |
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CAUSE |
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| REMEDY |
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Defective |
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| Replace |
secondary switch. |
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| secondary switch. |
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Defective PCB |
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| Replace PCB |
assembly. |
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| assembly. |
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and PCB |
| No continuity |
assembly. |
| |
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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 |
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| Lower than 90% of |
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| rating voltage. |
| |
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
