primary
transformer
Place a graduate of 275ml water at the middle of the
tray
of the oven (FIG.5 - 1).
the door, power set high,
set
to 3
press the
to operate the oven.
rectified the microwave leakage
measure around the
door crack, those hole position of the window and the air vent at
four sides of the oven with the próbę of the measure. When
the moving speed of the próbę should not exceed
25mm per second, and the measuring direction should be the
same with the outing direction of the próbę should not exceed
25mm per second, and the measuring direction should be the
same with the outing direction of the
leakage (FIG.5 -
When measuring the ultimate value of microwave leakage of all the measure position should not exceed 1
of should be considered as abnormal.
5.2.4
WHEN THE OVEN AT
BUT THE FOOD
BE HEATED.
(1) Examine when the lamp is on, the glass tray is cycling, the
Fig. 5-3
fan operating normal:
Take
the cabinet, starting the oven, measure the
of the
transformer with an avometer to see whether it is enough to
220V. it is enough to 220V, then the
high voltage of
the transformer should be examined as FIG.5 - 3.
Measure it with the 2500V-alternating grade of model 500
avometer. One rod of the avometer connects the iron
of the
transformer, the other rod connects the secondary high voltage
(FIG.5 - 4). The avometer reading should be about
(when measure, be careful with the high voltage). If no voltage
at all, it indicates that the transformer has broken, and should be
replaced by a new one. If it is enough to
then check the
filament voltage of the transformer with alternating
grade of
an
the value should be about 3.4V (FIG.5 - 5).
If there is no voltage at all, it indicates the transformer has
broken, and should be replaced by a new one. If it is enough to
3.4V, check the filament resistance of the magnetron, measure
the filament
with the
grade of a avometer (FIG.5 - 6). If
it is open -
it indicates the magnetron has broken, and
should be replaced by a new one. It is normal if the resistance
smali. Then check whether the magnetron
has broken,
if broken, replace with a new magnetron.
If there is no problem with the
check the high
voltage diodę then. Measure the diodę with
grade of an
avometer, the
rod end of the avometer connect the cathode
of the diodę, the
rod end of the avometer connect the anodę
the diodę
The avometer reading should be about 150 thousand ohms.
The change the rod to
electrode, the reading should be
. If the reading is
smali, and near to
it
indicates the high voltage diodę has been punctured, and
should be replaced by a new one.
If the high voltage diodę is
then check the
of the transformer to see whether it is enough to 220V. If it is not
enough, check the
- switch of the time and power
distributor. Connect the two rods of the avometer to the 1,2 place
of the timer with
grade. It is normal if the reading is "O"
when at cut off condition. If the reading is
, it indicates the
11
transformer
secondary winding
Fig. 5-4
filament
Fig. 5-5
magnetron
