9 TROUBLESHOOTING GUIDE
9.1. NE-1027
CAUTION
1. Check grounding before checking for trouble.
2. Be cafeful of the high voltage circuit.
3. Discharge high voltage capacitor.
4. When checking the continuity of the switches or the high voltage transformer, disconnect one lead wire from these parts and then check
continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
When disconnecting a plastic connector from a terminal, you must hold the plastic connector instead of the lead wire and then disconnect it,
otherwise lead wire may be damaged or the connector cannot by removed.
First of all operate the microwave oven following the correct operating procedures in order to find the exact cause of any trouble.
9.1.1. [TROUBLE 1] Oven does not start cooking
SYMPTOM CAUSE CORRECTIONS
1. Oven is dead. 1. Open or loose lead wire harness
Fuses is OK. 2. Open thermal cutout (Magnetron)(Oven) Check fan motor when thermal cutout is defective.
2. No microwave oscillation. 1. Off-alignment of latch switches Adjust door and latch switches.
Other operation is OK. 2. Defective secondary latch switch (SW2)
3. Open or loose wiring of secondary latch switch,
vari-power switch and micro select switch
4. Defective variable power switch (SW7) Refer to component test procedure.
5. Open or loose connection of high voltage
circuit especially magnetron filament circuit
NOTE: Large contact resistance will bring lower
magnetron filament voltage and causing
magnetron to lower output and/or intermittent
oscillation.
6. Defective high voltage component
H.V. Transformer
H.V. Capacitor
H.V. Diode
Magnetron
Check high voltage component according to
component test procedure and replace if it is defective.
20
NE-1027 / NE-1037
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