Panasonic NN-K153WF, Service Manual

Page: 6 / 53

3.1. 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.
3.2. 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 and short
the terminal of the high voltage capacitor (terminal of lead wire from diode) to chassis ground
with an insulated handle screwdriver to discharge.
WARNING
There is high-voltage present, with high-current
capabilities in the circuits of the high voltage
winding and filament winding of the high voltage
transformer. It is extremely dangerous to work on
or near these circuits with oven energized. / DO
NOT measure the voltage in the high voltage
circuit including filament voltage of magnetron.
WARNING
Never touch any circuit wiring with your hand nor
with an insulated tool during operation.
3.3. When parts must be replaced, remove the power plug from the
outlet.
3.4. When the 8 Amp fuse is blown due to the operation of short
switch:
6