Samsung CM1929 - Alignment and Adjustments; High Voltage Transformer; Magnetron; High Voltage Capacitor

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5. 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.
5-1 High Voltage Transformer
1. Remove connectors from the transformer terminals and
check continuity.
2. Normal resistance readings are as follows:
Terminal Resistance
Secondary Approx. 98 Ω
Filament Approx. 0 Ω
Primary Approx. 1.3 Ω
(Room temperature = 20°C)
Primary
Terminals
Secondary
Terminal
5-2 Magnetron
1. Continuity checks can indicate only an open lament or
a shorted magnetron. To diagnose an open lament or
shorted magnetron.
2. Isolate the magnetron from the circuit by disconnecting its
leads.
3. A continuity check across the magnetron lament terminals
should indicate one ohm or less.
4. A continuity check between each lament terminal and
magnetron case should read open.
Cooling Fins
Magnetron Antenna
Gasket Plate
5-3 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 innite.