Panasonic NE-1027 - Check Cycle Counter; Troubleshooting and Maintenance; Self-Diagnostic Failure Codes; Oven Cleaning Procedures

9.1.2. [TROUBLE 2] Fuse is blown
SYMPTOM CAUSE CORRECTIONS
1. 10A fuse is blown. 1. Shorted lead wire harness
2. Shorted H.V. Capacitor
3. Shorted H.V. Diode Replace H.V. Diode and protector diode
(*NOTE)
4. Defective magnetron Replace magnetron and protector diode
(*NOTE)
5. Shorted H.V. Transformer Replace H.V.Transformer and protector diode
(*NOTE)
6. Shorted Protector diode
2. 2.5A fuse is blown. 1. Defctive primary latch switch and short switch Check adjustment of primary, secondary latch
switch and short switch including door.
2. Open or loose wiring of power relay (RY2)
3. Defective power relay (RY2)
4. Defective relay control circuit
*NOTE:
Be sure to replace protector diode together with those H.V.components.
In this case, only D2 of protector diode may be shorted due to faulty H.V.component. Therefore,
if protector diode is not replaced together, high voltage transformer will be damaged (over
heated).
9.1.3. [TROUBLE 3] Other troubles
SYMPTOM CAUSE CORRECTIONS
1. Microwave output is low. 1. Decrease in power source voltage Consult electrician
Oven takes longer time to cook food. 2. Open or loose wiring of magnetron filament
circuit. (Intermittent oscillation)
3. Aging change of magnetron
2. Loud buzzing noise can be heard. 1. Loose fan and fan motor
2. Loose screws on H.V. Transformer
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NE-1027 / NE-1037