5.3REPAIRING METHOD OF SEVERAL BREAKDOWN
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 | door pushing | screw |
screws of the hinge (up and low) as | part at |
|
between the door and the oven. Then measure again, the | right above |
|
leakage amount should be less than 1 milliwatt/cm2. Generally, |
|
|
it should be controlled below 0.75 milliwatt/cm2 with some |
| micro switch |
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 | door pushing | screw |
adjust the upper screw as FIG.5 – 15. Loosen out the screw, | part at |
|
push the door close to the oven to hook the door hook with the | right below |
|
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
21