23
6. Alignment and Adjustments
PRECAUTION
1.
High voltage is present at the high voltage terminals during any cook cycle .
2.
It is neither necessary nor advisable to attempt measurement of the high voltage .
3.
Before touching any oven components or wiring, always unplug the oven from its power source and
discharge the high voltage capacitor .
6-1 High Voltage Transformer
1.
Remove connectors from the transformer terminals and
check continuity .
2.
Normal resistance readings are as follows:
SHV-U1870D
Secondary
Approx. 125.0 Ω + 2%
Filament
Shows Continuity
Primary
Approx. 0.390 Ω + 2% (Hi)
Approx. 0.430 Ω + 2% (Low)
(Room
temperature = 20°C)
&ILAMENT
4ERMINALS
3ECONDARY
4ERMINAL
0RIMARY
4ERMINAL
6-2 Magnetron
1.
Continuity checks can indicate only an open filament or
a shorted magnetron. To diagnose an open filament or
shorted magnetron .
2.
Isolate the magnetron from the circuit by disconnecting its
leads .
3.
A continuity check across the magnetron filament terminals
should indicate one ohm or less .
4.
A continuity check between each filament terminal and
magnetron case should read open .
#OOLING&INS
-AGNETRON!NTENNA
'ASKET0LATE
6-3 High Voltage Capacitor
1.
Check continuity of the capacitor with the meter set at the highest resistance scale .
2.
Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ.
3.
A shorted capacitor will show continuous continuity .
4.
An open capacitor will show constant 9MΩ.
5.
Resistance between each terminal and chassis should read infinite.
