Sanyo EM-U1000W Service Manual - Page 21

The Requirements Of Microwave After It Has Been Repaired

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have, scrape the oxidized layer or the lacquer off. When fix the magnetron, the copper filament weaved washer must be placed well, the screws must be twist tightly. 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 are 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 pull out the power plug and take down the turntable combination, measure the resistance value of the turntable motor R×1K grade of a multimeter. 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. Pull out the power plug, take down the cabinet an discharge the capacitor. Pull out the two terminal plugs of the lamp. Measure the two plugs of the lamp with the R×100 grade of a multimeter. 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, pull out the power plug, 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 are felt on it. If the felt are 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 plug 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 multimeter, 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. 1.19 THE REQUIREMENTS 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: 1.19.1 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 plug is not connected. 1.19.2 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 plug, close the door, power set high, time set 3 minutes to make 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 probe of the measure when measuring, the moving speed of the probe should not exceed 25mm/sec. The measuring direction of the probe must be the same with the outgoing direction of the microwave leakage. 19

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19
have, scrape the oxidized layer or the lacquer off. When fix the magnetron, the copper filament weaved washer
must be placed well, the screws must be twist tightly. 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 are 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 pull out the power plug and take
down the turntable combination, measure the resistance value of the turntable motor R×1K grade of a multimeter.
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.
Pull out the power plug, take down the cabinet an discharge the capacitor.
Pull out the two terminal plugs of the lamp. Measure the two plugs of the lamp with the R×100 grade of a
multimeter.
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, pull out the power plug, 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
are felt on it. If the felt are 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 plug 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 multimeter, 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.
1.19
THE REQUIREMENTS 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:
1.19.1 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 plug is not connected.
1.19.2 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 plug,
close the door, power set high, time set 3 minutes to make 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 probe of the
measure when measuring, the moving speed of the probe should not exceed 25mm/sec. The measuring direction
of the probe must be the same with the outgoing direction of the microwave leakage.