Alignment And Adjustments; High Voltage Transformer; Magnetron; High Voltage Capacitor - Kenmore 401.85052010 Service Manual

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)

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 .

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.
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