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(2) Measure it with the 2500V alternating grade of model 500 multi meter. One rod of the multi meter connect the iron core
of the transformer, the other rod connect the secondary high voltage plug(FIG.5-4).The multi meter reading should be about
2100v(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 2100v,then check the filament voltage of the transformer with alternating
10v grade of a multi meter, the value should be about 3.4v(FIG.5-5).
Transformer
Primary winding
Filament winding
Fig.5-5
(3) 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
3.4x,check the filament resistance of the magnetron, measure the filament plug with the Rx1 grade of a multi meter
(FIG.5-6).If it is open-circuited, it indicates the magnetron has broken, and should be replaced be a new one. It is normal if
the resistance value is very small. Then check whether the magnetron steel has broken, if broken, replace with a new
magnetron.
(4) If there is no problem with the magnetron, check the high voltage diode then. Measure the diode with Rx10k grade of a
multi meter, the "+" rod end of the multi meter connect the cathode of diode, the "-" rod end of the multi meter connect the
anode of the diode(FIG.5-7).The multi meter reading should be about 150 thousand ohm. Then change the rod to different
electrode, the reading should be "
has been punctured, and should be replaced by a new one.
Secondary winding
Fig.5-3
".If the reading is very small, and near to short circuit, it indicates the high voltage diode
Fig.5-8
Fig.5-6
Fig.5-4
Fig.5-7
Secondary
winding
Fig.5-9
4-2
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