Disassembly And Parts Replacement Procedure - Panasonic NE-2156 Service Manual

8.3. 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
to discharge.
Important Note
1. High voltage above 250 volts are existing on following parts during
operation.
· Magnetron
· High Voltage Transformer
· High Voltage Diode
· High Voltage Capacitor
Unusual attention should
troubleshooting of product.
2. If the microwave oven is operated with incorrect installed door
hinge or magnetron, it can cause microwave leakage of over
5mW/sequar centimeter. Hence it is absolutely necessary to
check if magnetron and door hinge are correctly and safely
installed after repairs or replacement.
9 DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
CAUTION
Servicemen should remove their watches whenever working close to
or replacing the magnetron.
9.1. Replacement of magnetrons
(Upper and Lower)
Upper magnetron
be paid during repair or
Never touch any circuit wiring with your hand nor with an insulated tool
during operation.
8.4. When parts must be replaced,
always remove the power plug
from the outlet, and discharge
the high voltage capacitor.
8.5. Confirm after repair
1. After repair or replacement of parts, make sure that the
screws of the oven, etc. are neither loose nor missing.
Microwave might leak if screws are not properly tightened.
2. Make sure that all electrical connections are tight before
inserting the plug into the wall outlet.
8.6. Avoid inserting nails, wire, etc.
through holes in 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.
8.7.
CAUTION MICROWAVE RADIATION
Personnel should not be exposed to the microwave energy which may
radiate from the magnetron or other microwave generating device if it
is improperly used or connected all input and output microwave
connections waveguides, flanges, and gasket must be secure. Never
operate the device without a microwave energy absorbing load
attached. Never look into an open waveguide or antenna while the
device is energized.
8.8.
High voltage parts may become uncovered when outer cabinet is
removed.
1. Discharge electric charge remaining on the high voltage
capacitors.
2. Remove the entire rear panel by removing screws as
shown.
3. Disconnect all lead wires from magnetron and thermal
cutout.
4. Remove the 4 screws holding magnetron.
15
NE-2156 / NE-2146 / NE-1656
WARNING
CAUTION