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TROUBLESHOOTING AND REPAIR | ||||||
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| POWER BOARD TEST (continued) |
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| TABLE F.4 – POWER BOARD VOLTAGE CHECKS |
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CHECK POINT | TEST | CONNECTOR | LEAD NO. OR | NORMAL | ||
LOCATION | DESCRIPTION | PLUG PIN NO. | IDENTITY | ACCEPTABLE | ||
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| VOLTAGE |
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| READING |
POWER BOARD | CHECK 40 VDC |
| 2 (+) |
| 477 (+) | 38 – 42 VDC |
CONNECTOR | INPUT FROM |
| 1 |
| 475 |
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PLUG J41 | DC BUS BOARD | NEG. |
| POS. |
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POWER BOARD | CHECK +15 |
| 1 (+) |
| 225 (+) | +15 VDC |
CONNECTOR | VDC SUPPLY FROM | 225 | 5 |
| 222 |
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PLUG J42 | POWER BOARD |
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| 222 |
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POWER BOARD | CHECK +5 VDC |
| 3 (+) |
| 221 (+) | +5 VDC |
CONNECTOR | SUPPLY FROM |
| 5 | 221 | 222 |
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PLUG J42 | POWER BOARD |
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| 222 |
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POWER BOARD | CHECK |
| 2 (+) |
| 222 (+) | |
CONNECTOR | SUPPLY FROM | 223 | 5 |
| 223 |
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PLUG J42 | POWER BOARD |
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| 222 |
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| 4 (+) |
| 226 (+) | +5 VDC |
POWER BOARD | CHECK +5 VDC |
| 9 | 226 | 228 |
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CONNECTOR |
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PLUG J43 | FROM POWER BOARD |
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| 228 |
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| 6 (+) |
| 266 (+) | +15 VDC |
POWER BOARD | CHECK +15 VDC |
| 11 | 266 | 267 |
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CONNECTOR | SPI SUPPLY FROM |
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PLUG J43 | POWER BOARD |
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| 267 |
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| 3 (+) |
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POWER BOARD | CHECK +5 VDC | 268A | 12 |
| 268A (+) | +5 VDC |
CONNECTOR | SPI SUPPLY FROM |
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| 262 |
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PLUG J43 | POWER BOARD |
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| 262 |
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| 7 (+) |
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POWER BOARD | CHECK +20 VDC STT | 346 1 |
| 345 (+) | +20 VDC | |
CONNECTOR | SUPPLY FROM |
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| 346 |
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PLUG J43 | POWER BOARD |
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| 345 |
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