_______________
 A. If the test gives the maintenance message INVALID LRU IDENT:
 - Do the LRU Identification Check (Ref. AMM TASK 31-60-00-740-011)
 (1) Make sure that the EIS software P/N of the upper ECAM DU is the same as the EIS software P/N on the microdisk that is in the storage box.
 (a) If the part numbers are the same:

 - replace the DU-ECAM, UPPER (4WT1) (Ref. AMM TASK 31-63-22-000-001) (Ref. AMM TASK 31-63-22-400-001)

 (b) If the part numbers are not the same:

 - do the crossloading of the DMC1 to the upper ECAM DU (Ref. AMM TASK 31-60-00-610-001)
 B. Do the test given in Para. 3.A

 Display System Version Inconsistency of the lower ECAM DU
 1. Possible Causes
_______________
 - DU-ECAM, LOWER (4WT2)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-60-00-610-001 X LOADING Procedure of the DMC1 to the PFD CAPT, ND
 CAPT, the EWD or the SD AMM 31-60-00-740-004 EIS System Test AMM 31-60-00-740-011 LRU Identification Check AMM 31-63-22-000-001 Removal of the Display Unit
 (2WT1,2WT2,3WT1,3WT2,4WT1,4WT2) AMM 31-63-22-400-001 Installation of the Display Unit (2WT1,2WT2,3WT1,3WT2,4WT1,4WT2)
 3. Fault Confirmation
__________________
 A. Reset the DU
 (1) On the ECAM Control Panel (6WT):
 - turn the ECAM lower display potentiometer to the OFF position then to the BRT middle position. If the DISPLAY SYSTEM VERSION INCONSISTENCY message is not shown on the lower ECAM DU

 - no maintenance action is necessary.

 (a) If the DISPLAY SYSTEM VERSION INCONSISTENCY message is shown on the lower ECAM DU
 - do the following test.
 B. Test
 - Do the EIS System Test (Ref. AMM TASK 31-60-00-740-004)

 4. Fault Isolation
_______________

 A. If the test gives the maintenance message INVALID LRU IDENT:
 - Do the LRU Identification Check (Ref. AMM TASK 31-60-00-740-011)
 (1) Make sure that the EIS software P/N of the lower ECAM DU is the same as the EIS software P/N on the microdisk that is in the storage box.
 (a) If the part numbers are the same:

 - replace the DU-ECAM, LOWER (4WT2) (Ref. AMM TASK 31-63-22-000-001) (Ref. AMM TASK 31-63-22-400-001)

 (b) If the part numbers are not the same:

 - do the crossloading of the DMC1 to the lower ECAM DU (Ref. AMM TASK 31-60-00-610-001)
 B. Do the test given in Para. 3.A

 Failure of the LRU Identification on the DMC1
 1. Possible Causes
_______________
 - DMC-1 (1WT1)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-60-00-610-006 UP LOADING Procedure of the DMC1 with a portable DATA
 LOADER AMM 31-60-00-740-004 EIS System Test AMM 31-60-00-740-011 LRU Identification Check AMM 31-63-34-000-001 Removal of the DMC (1WT1,1WT2,1WT3) AMM 31-63-34-400-001 Installation of the DMC (1WT1,1WT2,1WT3)
 3. Fault Confirmation
__________________
 A. Reset the DU
 (1) On the overhead C/B panel (49VU):
 - open then close the circuit breaker 10WT1

 (a) If the DISPLAY SYSTEM VERSION INCONSISTENCY message is not shown on the CAPT PFD DU, CAPT ND DU, F/O PFD DU, F/O ND DU, upper ECAM DU and lower ECAM DU

 - no maintenance action is necessary.

 (b) If the DISPLAY SYSTEM VERSION INCONSISTENCY message is shown on the CAPT PFD DU, CAPT ND DU, F/O PFD DU, F/O ND DU, upper ECAM DU and lower ECAM DU

 - do the following test.
 B. Test
 - Do the EIS System Test (Ref. AMM TASK 31-60-00-740-004)

 4. Fault Isolation
_______________

 A. If the test gives the maintenance message INVALID LRU IDENT:
 - Do the LRU Identification Check (Ref. AMM TASK 31-60-00-740-011)
 (1) Make sure that the EIS software P/N of the DMC1 is the same as the EIS software P/N on the microdisk that is in the storage box.
 (a) If the part numbers are the same:

 - replace the DMC-1 (1WT1) (Ref. AMM TASK 31-63-34-000-001) (Ref. AMM TASK 31-63-34-400-001)

 (b) If the part numbers are not the same:
　
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