D.
Do a check to find a defective PSEU circuit card (Optional) (Tables 1-4)
NOTE: You must make a record of the shop faults before you remove the
____
PSEU. This will permit you to find which circuit card is
defective.
S 814-016
(1)
For messages in Table 1 items 1-27, 39-42, 46; Table 2 items 1-2, 5-6, 11, 15-20, 25; do the steps as follows:
(a)
Look for the THIS CPU or the OTHER CPU message at the end of the shop fault message.
(b)
If you see the THIS CPU message, do these steps: 1) Do a check for CMCS present leg faults for 32903 PSEU BUS-A>EIU BUS FAIL 2) Do a check for CMCS present leg faults 32904 PSEU BUS-B>EIU BUS FAIL 3) If CMCS messages 32903 and 32904 do not show, card A01 is
defective 4) If CMCS message 32903 shows, card A14 is defective 5) If CMCS message 32904 shows, card A01 is defective.
(c)
If you see the OTHER CPU message, do these steps: 1) Do a check of the CMCS present leg faults for 32903 PSEU BUS-A>EIU BUS FAIL 2) Do a check of the CMCS present leg faults for 32904 PSEU BUS-B>EIU BUS FAIL 3) If CMCS messages 32903 and 32904 do not show, card A14 is
defective 4) If CMCS message 32903 shows, card A01 is defective 5) If CMCS message 32904 shows, card A14 is defective.
S 814-017
(2)
For all other shop fault messages, do the steps that follow:
(a)
Find the shop fault message in table 1.
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747-400 MAINTENANCE MANUAL
(b) Find the number of the defective circuit card.
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747-400 MAINTENANCE MANUAL
~.............................................................................. | TABLE 1 | ................................................................................ | ITEM | DISPLAYED SRF MESSAGE |CARD NUMBER| ................................................................................
| 1. |CPU CARD; EEPROM CHECKSUM DEVICE 1 |A01 OR A14 |
| 2. |CPU CARD; EEPROM CHECKSUM DEVICE 2 |A01 OR A14 |
| 3. |CPU CARD; RAM PATTERN DEVICE 1 |A01 OR A14 |
| 4. |CPU CARD; RAM PATTERN DEVICE 2 |A01 OR A14 |
| 5. |CPU CARD; NVM WRITE DEVICE 1 |A01 OR A14 |
| 6. |CPU CARD; NVM WRITE DEVICE 2 |A01 OR A14 |
| 7. |CPU CARD; NVM CHECKSUM DEVICE 1 |A01 OR A14 |
| 8. |CPU CARD; NVM CHECKSUM DEVICE 2 |A01 OR A14 |
| 9. |CPU CARD; NVM WRITE TIME DEVICE 1 |A01 OR A14 |
| 10. |CPU CARD; NVM WRITE TIME DEVICE 2 |A01 OR A14 |
| 11. |CPU CARD; NVM UNINITIALIZED |A01 OR A14 |
| 12. |CPU CARD; INVALID FAULT DATA |A01 OR A14 |
| 13. |CPU CARD; NVM AT 90% USEFUL LIFE |A01 OR A14 |
| 14. |CPU CARD; 8097 REGISTER |A01 OR A14 |
| 15. |CPU CARD; SERIAL LINK PARITY |A01 OR A14 |
| 16. |CPU CARD; SERIAL LINK EXCESSIVE SYNC |A01 OR A14 |
| 17. |CPU CARD; STACK OVERFLOW CPU CARD: WATCHDOG TIMEOUT |A01 OR A14 |
| 18. |CPU CARD; ARINC 429 INTERNAL WRAP |A01 OR A14 |
| 19. |CPU CARD; INVALID FAULT DATA |A01 OR A14 |
| 20. |CPU CARD; POWER ABSENT TIMER CIRCUIT |A01 OR A14 |
| 21. |CPU CARD; UNKNOWN CPU DESIGNATION |A01 OR A14 |
| 22. |CPU CARD; SERIAL_RCV_PRESENT |A01 OR A14 |
| 23. |CPU CARD; SERIAL_RCV_ABSENT |A01 OR A14 |
| 24. |CPU CARD; A429 RX OTHER CPU PRESENT |A01 OR A14 |
| 25. |CPU CARD; A429 RX OTHER CPU PARITY |A01 OR A14 |
| 26. |CPU CARD; POWER STATUS ABSENT |A01 OR A14 |
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