Panasonic NE-2140, Service Manual

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15. COMPONENT TEST PROCEDURE
CAUTION
1. High voltage is present at the high voltage terminal of the high
voltage transformer 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.
15.1. High voltage transformer
1. Remove connections from the transformer terminals and check
continuity.
2. Normal (cold) resistance readings should be as follows:
Secondary winding Approx. 40 — 100
Filament winding Approx. 0
Primary winding Approx. 0 — 3
15.2. High voltage capacitor
1. Check continuity of capacitor with meter on highest OHM scale.
2. A normal capacitor will show continuity for a short time, and then
indicate 9M once the capacitor is charged.
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show constant 9M .
5. Resistance between each terminal and chassis should be infinite.
15.3. Magnetron
Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose for an open
filament or shorted magnetron.
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