Cautions To Be Observed When Troubleshooting - Panasonic NN-J993 Service Manual

7 CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
Unlike many other appliances, the microwave oven is high-
voltage, high-current equipment. Though it is free from danger
in ordinary use, extreme care should be taken during repair.
7.1. Check the grounding
Do not operate on a 2-wire extension cord. The microwave
oven is designed to be used when grounded. It is imperative,
therefore, to make sure it is grounded properly before
beginning repair work.
7.2. Inverter Warnings (NEW H.V.)
7.3. When parts must be replaced,
remove the power plug from
the outlet.
7.4. When the 10A/18A 250V fuse
is blown due to the operation
of short switch:
1. This is mandatory. Refer to "Adjustments and Measurement"
for these switches.
2. When replacing the fuse, confirm that it has the appropriate
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NN-J993