A. Trouble Shooting Procedure for the digital Links.
 Use the procedure that follows to find:

 - if the fault is in one of the receivers (computer B, C or D) of the digital signal (refer to the schematic in the initial procedure to find the receivers related to the digital signal), or

 - if the fault is an unwanted ground of the digital signal.

 A fault in one receiver can change the status of the digital signal and cause a fault detection by all the receivers.
 The initial trouble shooting procedure can only let you know that the possible cause of the fault is the digital source A or the wiring (discontinuity of the digital signal).
 (1) Remove the computer B.

 (2) Do the test given in Para. 3. of the initial procedure.

 (a) if the fault stops:

 - replace the computer B.

 (b) If the fault continues:

 - install the computer B
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : ALL ∞∞31-32-00∞∞∞∞∞∞∞∞∞∞Page A285
 May 01/05 CES

 Digital Links Failure
 Figure 203/TASK 31-32-00-991-003

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : ALL ∞∞31-32-00∞∞∞∞∞∞∞∞∞∞Page A286
 May 01/05 CES

 - remove the computer C

 - do the test given in Para. 3. of the initial procedure. 1 If the fault stops:

_

 - replace the computer C. 2 If the fault continues:

_

 - install the computer C

 - remove the computer D

 - do the test given in Para. 3. of the initial procedure. a If the fault stops:

_

 - replace the computer D.
 b If the fault continues:

_

 - remove the computers B, C, D and the digital source A

 - do a check of the wiring for a short to ground

 - install the computers B, C, D and the digital source A. c If the fault continues:
_

 - continue the initial procedure.

R **ON A/C 401-499,
R TASK 31-32-00-810-935 R Loss of the BUS from the SDU to the CFDIU R 1. Possible Causes
_______________
R - CFDIU (1TW) R - wiring R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R R R R R  AMM 31-32-00-740-009 AMM 31-32-34-000-001 AMM 31-32-34-400-001 ASM 31-32/03 ASM 31-32/04  Read the AVIONICS STATUS on the MCDU Removal of the CFDIU (1TW) Installation of the CFDIU (1TW) 
R  3. Fault Confirmation

__________________
R A. Read the AVIONICS STATUS on the MCDU (Ref. AMM TASK 31-32-00-740-009). R 4. Fault Isolation
_______________
R A. If the test gives the maintenance message NO SDU DATA:
R
R - replace the CFDIU (1TW) (Ref. AMM TASK 31-32-34-000-001) and (Ref. AMM
R TASK 31-32-34-400-001).

R (1) If the fault continues:
R
R - do a check and repair the wiring from the CFDIU (1TW) to the first
R terminal block (Ref. ASM 31-32/03) (Ref. ASM 31-32/04):

R (a) Pin AA/11F, 11G to the first terminal block.

R (b) Pin AA/13D, 13E to the first terminal block.

R B. Do the test given in Para. 3.B.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 401-499, ∞∞31-32-00∞∞∞∞∞∞∞∞∞∞Page A288
 Aug 01/05 CESR **ON A/C 062-099, 106-149, 151-199, 201-299, 301-399, 401-499,

 TASK 31-32-00-810-936
 Loss of the BUS from the Multipurpose Disk Drive Unit (MDDU) to the CFDIU

 1. Possible Causes
_______________
 - MDDU

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-32-00-740-009 Read the AVIONICS STATUS on the MCDU
 AMM 31-38-22-000-001 Removal of the MDDU (1TD)
 AMM 31-38-22-400-001 Installation of the MDDU (1TD)
 ASM 31-38/01

 3. Fault Confirmation
__________________
　
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