1. Possible Causes
_______________
 - DIGITAL INTERFACE UNIT (DIU) (190MH)

 - ATSU (1TX1)

 - wiring of the Cabin Terminal 2 DATA BUS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-34-34-000-001 Removal of the Digital Interface Unit (DIU) (190MH)
 AMM 23-34-34-400-001 Installation of the Digital Interface Unit (DIU)
 (190MH) 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 CT2(190MH)/ATSU1(1TX1):
 - replace the DIGITAL INTERFACE UNIT (DIU) (190MH) (Ref. AMM TASK 23-34-34-000-001) and (Ref. AMM TASK 23-34-34-400-001).
 (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 DIU and the ATSU

 - do a check and repair the wiring of the Cabin Terminal 2 DATA BUS: between the ATSU and the DIU (Ref. ASM 46-21/05).

 - install the DIU 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 220
 401-499, Aug 01/05 CES Loss of the DMC 1 Input Signal Detected by the ATSU

 1. Possible Causes
_______________
 - DMC-1 (1WT1)

 - ATSU (1TX1)

 - wiring of the DMC 1 DATA BUS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
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)
 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 DMC1(1WT1)/ATSU1(1TX1):
 - replace the DMC-1 (1WT1) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001).
 (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 DMC 1 and the ATSU

 - do a check and repair the wiring of the DMC 1 DATA BUS: between pins AB/1E,1F of the DMC 1 and pins AA/5A,5B of the ATSU (Ref. ASM 46-21/05)

 - install the DMC 1 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 221
 401-499, Aug 01/05 CES Loss of the DMC 2 Input Signal Detected by the ATSU

 1. Possible Causes
_______________
 - DMC-2 (1WT2)

 - ATSU (1TX1)

 - wiring of the DMC 2 DATA BUS

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