TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING
- CAUTIONS -
-ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.
Filament
Winding
Secondary
Winding
Primary
Winding
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| Figure 24 | |
A. TEST PROCEDURES |
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COMPONENTS |
| TEST PROCEDURES | RESULTS |
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| 1) | Measure the resistance: Across the |
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| filament terminals of the magnetron | Normal reading: | |
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| with an | Less than 1 ohm. | |
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| 2) | Measure the resistance: Between | Normal reading: | |
MAGNETRON |
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| each filament terminal of the | Infinite ohms. | |
(Wire leads are |
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| magnetron and the chassis ground |
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removed) |
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| with an | NOTE: Replace the magnetron, if the | |
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| magnetron checks and all of the | |
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| high voltage component tests are | |
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| good, but the unit still does not heat | |
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| a load. | |
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| 1) | Measure the resistance: |
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| With an | Normal readings: | |
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| a. Primary winding; | Approx. 0.3 to 0.5 ohm. | ||
TRANSFORMER |
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| b. Filament winding; | Less than 0.1 ohm. | |
(Wire leads are |
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| c. Secondary winding; | Approx. 65 to 120 ohms. | |
removed) |
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| 2) | Measure the resistance: |
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| With an | Normal readings: | |
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| a. Primary winding to ground; | Infinite ohms. | |
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| b. Filament winding to ground; | Infinite ohms. | |
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NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.