(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
