TEST PROCEDURES
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| Next |
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| Test |
| Test |
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Step | Test | Check |
| Result | Conclusion | Step | Repair Action |
1A | Output pilot circuit | 223A to 210 |
| 24 VAC | Fan thermostat, choke | 1B |
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| thermostat, T1 trans- |
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| former and S4 all OK. |
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| 0 VAC | Check above compo- |
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1B |
| 302 (pos) to 275D (neg) |
| 15 VDC | T1 and 15V power sup- | 2 |
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| ply OK. |
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| 0 VDC | Check T1 and Power PC |
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| Board. |
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2 | Protection PC | 313 (neg) to 311 (pos) |
| <1 VDC | Protection PC Board OK |
| Replace Power |
| board output (set |
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| and Control PC |
| S4 on) |
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| Boards |
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| >5 VDC |
| 3A |
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3A | Static capacitor | Compare voltage across |
| <25 VDC | C1, C2, R1, R9 - OK |
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| balance (set S4 | terminals 9 & 12 of each |
| difference | (575 VAC machine C14, |
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| off) | Switch PC Board. |
| between | C15 - OK) |
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| 575 VAC |
| readings |
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| 380 VAC input | 460 VAC |
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| Replace |
| and higher test | 440 VAC |
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| 3B | Protection PC |
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| 415 VAC |
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| 380 VAC |
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| 575 VAC only - compare |
| >25 VDC | Check above compo- |
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| voltage across 9A & 13 |
| difference | nents. |
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| and 13 & 12A; then, 9B & |
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| 15 and 15 & 12B |
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3B | Dynamic capaci- | Connect as in step 3A. |
| <25 VDC | OK |
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| tor balance (set | Same voltages as above. |
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| S4 on) |
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| 380 VAC input |
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| >25 VDC | Power PC Board or | 4 |
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| and higher test |
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| Switch PC Boards are | and |
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| damaged. | 5 |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact your local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
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