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1. Repair when there occurred large amounts microwave
leakage. There are many factors which may cause microwave
leaking. Following mentioned may be the main causes of
microwave leakage:
(1) The door deformed, the hinge loosed or damaged that
caused the door can not close tightly.
(2) The door pressing cover or the embed piece damaged or
come off.
(3) Obvious damage or uneven of the oven.
(4) There are filth between the door and the oven.
(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
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21
door pushing
part at
right above
door pushing
part at
right below
screw
micro switch
screw
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