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 A. If the test gives the maintenance message AOC RAOC/ATSU1(1TX1) or if the AOC prompt is not shown on the ATSU DATALINK page on the MCDU:
 - load an AOC database with a Part Number that is different to the one applicable to this aircraft (Ref. AMM TASK 46-21-00-610-001).

 - start the ATSU again

 - then load the AOC database with the Part Number applicable to this aircraft.

 (1) If the fault continues:
 - replace the ATSU (1TX1) (Ref. AMM TASK 46-21-34-000-001) and (Ref. AMM TASK 46-21-34-400-001).
 B. Do the test given in Para. 3.
 「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 : 106-149, 151-199, 201-299, 301-399, ∞∞46-21-00∞∞∞∞∞∞∞∞∞∞Page 203
 401-499, Aug 01/05 CES Invalid Pin Programming of the ATSU

 1. Possible Causes
_______________
 - ATSU (1TX1)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 46-21-00-740-001 BITE Test of the ATIMS
 AMM 46-21-34-000-001 Removal of the Air Traffic Service Unit (ATSU) (1TX1)
 AMM 46-21-34-400-001 Installation of the Air Traffic Service Unit (ATSU)

 (1TX1) ASM 46-21/07
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the BITE test of the ATIMS (Ref. AMM TASK 46-21-00-740-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message WRG: PIN PROG/ATSU1(1TX1):
 - replace the ATSU (1TX1) (Ref. AMM TASK 46-21-34-000-001) and (Ref. AMM TASK 46-21-34-400-001).
 (1) If the fault continues:
 - do a check and repair the wiring from pins AB/15A, 15B, 15C, 15D, 15E, 15F, 15G, 15H, 15J, 15K, 14J, 14K of the ATSU to the first terminal block (Ref. ASM 46-21/07).
 B. Do the test given in Para. 3.
 「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 : 106-149, 151-199, 201-299, 301-399, ∞∞46-21-00∞∞∞∞∞∞∞∞∞∞Page 204
 401-499, Aug 01/05 CES

 Loss of the Clock Data Detected by the ATSU
 1. Possible Causes
_______________
 - CLOCK (2FS)

 - ATSU (1TX1)

 - wiring of the ATA 31 CLOCK INPUT BUS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 31-21-21-000-001 Removal of the Clock (2FS)
 AMM 31-21-21-400-001 Installation of the Clock (2FS)
 AMM 46-21-00-740-001 BITE Test of the ATIMS
 AMM 46-21-34-000-001 Removal of the Air Traffic Service Unit (ATSU) (1TX1)
 AMM 46-21-34-400-001 Installation of the Air Traffic Service Unit (ATSU)

 (1TX1)
 ASM 46-21/05

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the BITE test of the ATIMS (Ref. AMM TASK 46-21-00-740-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message CLOCK(2FS)/ATSU1(1TX1):
 - replace the CLOCK (2FS) (Ref. AMM TASK 31-21-21-000-001) and (Ref. AMM TASK 31-21-21-400-001).
 (1) If the fault continues:
 - replace the ATSU (1TX1) (Ref. AMM TASK 46-21-34-000-001) and (Ref. AMM TASK 46-21-34-400-001).
 (a) If the fault continues:
 - remove the clock and the ATSU

 - do a check and repair the wiring of the ATA 31 CLOCK INPUT BUS: between pins A/W,X of the clock and pins AA/5J,5K of the ATSU (Ref. ASM 46-21/05)

 - install the clock and the ATSU.

 B. Do the test given in Para. 3.
 「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 : 106-149, 151-199, 201-299, 301-399, ∞∞46-21-00∞∞∞∞∞∞∞∞∞∞Page 205
 401-499, Aug 01/05 CES Loss of the FMGC1 FM ACARS Input Signal

 1. Possible Causes
_______________
 - FMGC-1 (1CA1)

 - ATSU (1TX1)

 - wiring of the PRINTER ACARS & ATSU DATA BUS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
　
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