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TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING
- CAUTIONS -
-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE FIGURE 24)
-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
A. TEST PROCEDURES |
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| Figure 24 | ||||||
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COMPONENTS |
| TEST PROCEDURES |
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| RESULTS |
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| 1) | Measure the resistance: Across the |
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| filament terminals of the magnetron |
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| Normal reading: |
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| with an |
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| Less than 1 ohm. |
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| 2) | Measure the resistance: Between |
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| Normal reading: |
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MAGNETRON |
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| each filament terminal of the |
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| Infinite ohms. |
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(Wire leads are |
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| magnetron and the chassis ground |
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removed) |
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| with an |
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| 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 |
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| Normal readings: |
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| a. Primary winding; |
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| Approx. 0.3 to 0.5 ohm. |
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TRANSFORMER |
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| b. Filament winding; |
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| Less than 0.1 ohm. |
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(Wire leads are |
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| c. Secondary winding; |
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| Approx. 65 to 120 ohms. |
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removed) |
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| 2) | Measure the resistance: |
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| With an |
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| Normal readings: |
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| a. Primary winding to ground; |
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| Infinite ohms. |
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| b. Filament winding to ground; |
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| Infinite ohms. |
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NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.