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(5) The door and the oven are serious loosed after the door closed.
(6) The crack of the door shielding net cover.
Before repairing, check whether the above listed point are existed, if not, can you start the microwave oven.
Place a graduate of about 275ml water at the middle of the glass tray, close the door, time set at 3 minutes,
power at high, make the oven operating in normal. Rectify the microwave leakage measure, measure the amount
of the microwave leakage around the oven with its probe. If there are places which the leakage exceeds the
standard requirement, then repair them accordingly. If the leakage amount exceeds 1 milliwatt/cm2 at the left
door crack, then pull out the power plug, take down the cabinet,
adjust the screws of the hinge (up and low) as figure5-14 to less
the gap between the door and the oven. Then measure again,
the leakage amount should be less than 1 milliwatt/cm2.
Generally, it should be controlled below 0.75 milliwatt/cm2 with
some allowance.
If the leakage occurred at the right door crack, adjust the
screws which fix the interlock holder and the hook. If the
leakage is the larger side at the right – above of the oven, then
adjust the upper screw as FIG.5 – 15. Loosen out the screw,
push the door close to the oven to hook the door hook with the
plastic parts, then tighten the Screw again. If the leakage is
larger at the right – below, then adjust the lower screw as FIG. 5
– 15. Loosen the screw, push the door close to the oven to hook
the door hook with the switch holder tightly, then tighten the screw again, and open and close the door
repeatedly, to check whether the door can operate flexibly, whether the hook and the switch are in their normal
position. If it is not in position, then adjust the door hook and the switch holder repeatedly to make them to normal
position, to put through the interlocks, to cut off the pilot switch, to less the loose between the door and the oven,
then measure the leakage with microwave measure again.
If the leakage still exceeds standard requirement, then inspect whether the right oven is even or not, if not,
smooth it. Then adjust the door and the oven to eliminate their loose to the ultimate.
If there still exist microwave leakage, measure near the
magnetron with the probe of the microwave leakage mea-sure. If
the leakage is larger, the oven should be turned off and check
whether the four screws which fix the magnetron have been
loosed, if loosed, twist them tightly with socket wrench. If the four
screws are fixed, then the magnetron should be taken down to
check the copper filament weaved washer of the magnetron has
been placed well or whether the wave guide housing coupling
has been oxidized or have lacquer on it. If do 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 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.
Pull out the power plug, take down the cabinet an discharge the capacitor.
screw
screw
micro switch
door pushing
part at
right above
door pushing
part at
right below
