Filter
Top Products
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.
CAUTION
Servicemen should remove their watches whenever working close to or
replacing the magnetron.
10.1. 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.
10.2. Warning about the electric
charge in the high voltage
capacitor (
Figure).
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 and insulated handle
screwdriver or insulated jumper lead wire 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.
10.3. When parts must be replaced,
remove the power plug from
the outlet.
10.4. When the 15 Amp. (NE-
2180/NE-2180C) or 20 Amp.
(NE-3280) fuse is blown due to
the operation of interlock
monitor, replace the necessary
components according to the
following table.
10.5. Avoid inserting nails, wire, etc.
through any holes in the unit
during operation.
Never insert a wire, nail or any other metal object through the
lamp holes on the cavity or any other holes or gaps, because
such objects may work as an antenna and cause microwave
leakage.
10 CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
16
NE-3280 / NE-2180 / NE-2180C