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8 Troubleshooting Guide
8.1. Cautions to be observed when troubleshooting
Unlike many other appliances, the microwave oven is high-volt-
age, high-current equipment. Though it is free from danger in
ordinary use, extreme care should be taken during repair.
8.1.1. Check the grounding
Do not operate on a 2-wire extension cord. The microwave
oven is designed to be used in a completely grounded condi-
tion. It is imperative, therefore, to make sure it is properly
grounded before beginning repair work.
8.1.2. If the door lock, the door switch,
the door seal or the door develops
a malfunction, be sure not to oper-
ate the oven until complete repairs
are made.
If the oven is operated with any of these parts in imperfect con-
dition, hazardous microwave leakage might occur.
8.1.3. Warning about the electric charge
in the high voltage capacitor
For about 30 seconds after the oven is turned off, an electric
charge remains in the high voltage capacitor. When replacing
or checking parts, remove the power plug from the outlet, wait
30 seconds and short the terminal of the high voltage capacitor
(terminal of lead wire from diode) to chassis ground with an
insulated jumper lead wire or an insulated handle screwdriver
discharge.
8.1.4. When parts must be replaced,
always remove the power plug from
the outlet, and discharge the high
voltage capacitor.
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