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'NN-9809, NN-9859, NN-9509
__MQss99W, MQ8869W
CAUTIONS
TO BE OBSERVED
WHEN
TROUBLESHOOTING
Unlike many other applianéés, thie microwavé oven is high-voltage, high- | 5, Avoid inserting nails, wire, etc. through any holes inthe
current equipment. Though it is free from danger in ordinary use, extreme
unit during operation.
.
"
.
3s
care should be taken
during repair.
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
CAUTION
may work as.an-antenna and cause microwave leakage.
Servicemen should remove their watches whenever
j
working close to or replacing the magnetron.
4. 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.
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 of Ghecking 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 handie
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.
HIGH. VOLTAGE
CAPACI TOR
Touch chassis side first then short to the high voltage capacitor
terminal.
6. Confirm after repair
WARNING
:
n l
ee
(A) After repair or replacement of parts, make sure that the screws of the
Never touch any circuit wiring with your hand nor with
oven, etc. are neither loose nor missing.
an insulated
tool during operation.
Microwaves might leak if screws are not properly tightened.
(B) Make sure that all electrical connections are tight before inserting the
plug into the wall outlet.
3. When
parts must be replaced, remove the power plug
(C) Check for microwave
energy
leakage.
(Refer to procedure
for
from
the outlet.
measuring
microwave energy leakage).
4. When the 15 Amp fuse is blown due to the operation of
short switch:
WARNING
When the 15 Amp. fuse is blown due to the operation
of short switch, you must replace Primary latch switch
and short switch.
For U.S.A. models,
also replace
power
relay B when
the continuity
check
reads
shorted contacts (1-2).
(A) This is mandatory. Refer to "Adjustments and Measurement" for these
switches.
(B) When replacing the fuse, confirm that it has the appropriate rating for
these models.
(C) When replacing faulty switches, be sure mounting tabs are not bent,
broken or otherwise deficient in their ability to hold the switches.
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