model one.
5.3
REPA1RING
METHOD
OF
SEYERAL
BREAKDOWN
1. Repair when there occurred
large
amounts microwave
leakage. There
arę
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
arę
filth
between the door and the oven.
(5) The door and the oven
arę
serious
loosed
after
the door
closed.
door hinge (up)
door hinge
(Iow)
Fig.5-14
(6) The crack of the door shielding net cover.
Before
repairing,
check whether the above listed point
arę
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,
mąkę
the oven operating in normal.
Rectify
the
microwave leakage measure, measure the amount of the microwave leakage around the oven with its próbę. If
there
arę
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
puli
out the power
pług,
take down the cabinet, adjust the
screws of the hinge (up and Iow) 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
Iower
screw as FIG. 5
door
pushing,
part
at
—
right
above
door pushing,
part
at
—
right below
screw
micro
switch
screw
Fig. 5-15
- 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
arę
in their normal position. If it is not in
position,
then adjust the door hook and
the switch holder repeatedly to
mąkę
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 próbę 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
arę
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
lacguer
on it. If do have, scrape the
oxidized
layer
or the
lacguer
off. When fix the magnetron, the
19
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