copper filament weaved washer must be placed well, the screws must be twist tightiy. Then turn on the oven and
measure again
until
it comply with the requirement. If the microwave leakage is larger at those hole position of
the window board. The oven should be turned
off
to inspect whether there
arę
crack among
them
(fig.5
- 16). If
several
holes
formed a
crack,
it
would
enlarge the microwave leakage. If
that
is the case, it indicates the door has
broken,
and should be replaced with a new door.
2. Means of repair when the oven can heat, but the turntable
glass
can't move
Firstly,
check whether the turntable holder is placed correctly. If it is correct, then
puli
out the power
pług
and take
down the turntable combination, measure the resistance value of the turntable motor
R*1K
grade of a avometer.
If it is open - circuited, it indicates the turntable motor has broken, and should be replaced by a new, same model
one. If the resistance value is
between
15 -22 K, it indicates the turntable motor is normal. Then check the
connecting
shaft
weave. If the plastics which the
shaft
insert
in has broken, a new
shaft
weave should replace
it.
3. Repair when the oven can heat, but the lamp is not on.
Puli
out the power
pług,
take down the cabinet an
discharge
the capacitor.
Puli
out the
two
terminal
plugs
of the lamp. Measure the
two
plugs
of the lamp with the
R*
100 grade of a
avometer.
If it is open - circuited, it indicates the lamp has broken, and should be replaced by a same model one.
4.Means of repair when the oven stop working
after
several minutes operating.
The phenomenon indicates the thermal cutout is playing its protective role, and you should check whether the fan
is working in normal. Turn off the oven,
puli
out the power
pług,
take down the cabinet, discharge the capacitor,
then turn the fan with hand to see whether it is moving flexibly. If not, it indicates that the
oil
bearing of the fan
motor has run off the oil, and should take down the fan combination to repair the motor. Loosen the two screws
which fix the bearing out the shaft and the bearing, and rinse them with kerosene (ATTENTION: The bearing can
only
be wiped with a
silk
which
moistened
with kerosene rather than be washed in the kerosene because there
arę
felt
on it. If the
felt
arę
soaked with kerosene, then the engine oil can not be sucked up. ). After the bearing
being cleaned, the felt should be refueled
fully
with engine oil (for when the oven is operating, the engine oil
empty
into the oil bearing slowly). Fix the bearing cover with two screws, turn the fan around
till
it can move
flexibly. Then install them to the
oven,
and
pług
in the two terminal plugs.
If the fan can move flexibly, then the winding of the fan motor should be examined. Measure the winding with
R*100
grade of a avometer, if it is open - circuited, it indicates the winding of the fan motor has broken, and
should be
re-placed
by a new, same model one.
S.4 THE
CKARACTERS
REOUIREMENTS
OF
MICROWAVE
AFTER IT HAS
BEEN
REPAIRED
After being repaired, the microwave oven should
have
a 30 minutes
trial
operation. It can be used only when it
has been demonstrated that
it
is in good conditions of safety, heating and defrosting. The oven must have the
following identifications when it at trial operating:
5.4.1 INSULATION:
Before conducted, measure the insulation resistance among those electric metal
parts
and the nonelectric metal
cabinet with a 500V.D.C. Megaohmmeter. The resistance value should not be less then 2 megaohm.
Testing condition: Door closed, power at
"high",
time
set at 3 minutes. This is the operating condition of the oven,
but the power
pług
is not connected.
5.4.2
MiCROWAVE
LEAKAGE:
Microwave leakage can not be
tell
by watching or touching. To be responsible for the user, the amount of
microwave leakage should be measured strictly, and should not exceed 5
milliwatt/cm2,
according to the IEC
STANDARD.
Some
countries stipulate that the maximum microwave leakage should not exceed 1
milliwatt/cm2.
For safety concern, we must control the leakage under 1
milliwatt/cm2
after the oven being repaired,
otherwise,
it
should be repaired again. Test must be proceeded completely and comply with the following procedures:
Put a graduate of about 275ml water at the middle of the turntable glass tray of the oven, insert the power
pług,
close
the door, power set high, time set 3 minutes to
mąkę
the oven in operation. Rectify the microwave leakage
measure first, measure around the door crack the metal net of the door and the air vent with the próbę of the
measure when measuring, the moving speed of the próbę should not exceed 25mm/sec. The measuring direction
of the próbę must be the same with the outgoing direction of the microwave leakage.
20
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