31-31-03
 ALL  ú ú 02 Page 406 ú Jan 20/98

A

757
MAINTENANCE MANUAL

 ~..............................................................................
 |  |  |  |  IS  |  |
 |  |  |  | Front  |  |
 |  |  |  IS  | Panel  |  |
 | DFDAU  |  | FRCP  | DFDAU  |  |
 | Bite  |  | Light  | BITE  | Action  |
 | Code  |  Bite Code Description  |  ON?  |LED ON? |  Note  |

 ................................................................................ |445 |FMC unknown DMU database command | NO | NO |Note 4 | 2........…..........................................…........…........…........1
 ~........................................................... | Acronyms And Abbreviations | ............................................................. | AIC |Analog Interface Card | | DB |Database | | DFDAU |Digital Flight Data Acquisition Unit | | DFDR |Digital Flight Data Recorder | | DIC |Digital Interface Card | | DMU |Data Management Unit | | FMC |FDAU Master Controller | 2..............…............................................1
  ú

 31-31-03
 ALL  ú ú 02 Page 407 ú Jan 20/98

A

757
MAINTENANCE MANUAL

 ~.............................................................................. | MAINTENANCE ACTION NOTES | ................................................................................ |Note 1: |This fault can occur if the +28VDC accelerometer excitation (LMP14E)| | |is grounded. Check accelerometer before removing the DFDAU unit. | ................................................................................ |Note 2: |This fault can occur if the +5VDC potentiometer excitation (RMP14E) |
 |  |is grounded.  Check if the analog potentiometer excitation is  |
 |  |grounded outside the DFDAU unit before removing and replacing the  |
 |  |unit.  |

 ................................................................................ |Note 3: |This fault can occur if any of the analog inputs to the DFDAU unit | | |are out of range or a leg on a three or four leg analog is missing. | | |The unit should not be returned until the analog input port is | | |checked. | ................................................................................ |Note 4: |The DFDAU unit requires databases for each airframe. These | | |databases are preloaded by AlliedSignal prior to unit shipping. | | |First check Boeing Maintenance Manual 31-31-01 and make sure you are| | |loading the correct mandatory and non-mandatory softwares. | | |Secondly, attempt reloading the databases before removing and | | |replacing the unit. | ................................................................................ |Note 5: |If a debug monitor is not connected or "PROC ON" was typed and the | | |fault is still present, remove and replace the unit. | ................................................................................ |Note 6: |The ground pins required to load the FDAU master controller | | |databases are not correct. This is not a hardware problem with the | | |DFDAU unit. | ................................................................................ |Note 7: |This fault is detected by the DFDAU unit when any airplane discrete | | |or database select discrete changes after the unit is running. | | |Make sure the airplane wiring for broken wires or a faulty | | |connector. | ................................................................................ |Note 8: |This fault originates at the Digital Flight Data Recorder (DFDR) and| | |not the DFDAU unit. Check the DFDR or the wiring between the DFDAU | | |and the DFDR before removing and replacing the unit. | ................................................................................ |Note 9: |The DFDAU unit has detected an error in data from an ARINC 429 port.| | |The LRU sending the data to the DFDAU unit should be checked. When | | |the airplane LRU's are powering up, and the DFDAU unit is powered up| | |first, the DFDAU unit will show the other LRU databases as inactive.| | |This fault is not an error and should go away when the inputs become| | |active to the DFDAU unit. | 2.........…....................................................................1
　
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