- do the CIDS2/CIDS BUS test through the MCDU/CFDS.

 (1) If the CIDS2/CIDS BUS test is OK:

 - install a new DIR-CIDS, 1 (101RH) (Ref. AMM TASK 23-73-34-400-001).

 (2) If the fault continues:

 - remove the DIR-CIDS, 2 (102RH) (Ref. AMM TASK 23-73-34-000-001).

 - install the DIR-CIDS, 1 (101RH) (Ref. AMM TASK 23-73-34-400-001).

 - do the CIDS1/CIDS BUS test through the MCDU/CFDS.

 (3) If the CIDS1/CIDS BUS test is OK:

 - install a new DIR-CIDS, 2 (102RH) (Ref. AMM TASK 23-73-34-400-001).

 (4) If the fault continues:

 - remove the DIR-CIDS, 1 (101RH) (Ref. AMM TASK 23-73-34-000-001)

 - open these CBs: 49VU: 154RH COM/CIDS/DEU A ESS/LINE 1 49VU: 155RH COM/CIDS/DEU A ESS/LINE 2 121VU: 167RH COM NAV/CIDS/DEU A NORM/L AFT 121VU: 165RH COM NAV/CIDS/DEU A NORM/L MID 121VU: 163RH COM NAV/CIDS/DEU A NORM/L FWD

 - make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/D15 and connector AA/E15 is between approx. 80 and 200 ohms (Ref. ASM 23-73/06).

 (5) If the resistance (line to line) is between approx. 80 and 200 ohms:

 - make sure that the resistance (line to GND) is not less than 50 ohms (short circuit) between: DIR-CIDS (101RH) and (102RH) connector AA/D15 and GND, DIR-CIDS (101RH) and (102RH) connector AA/E15 and GND. (Ref. ASM 23-73/06)
 (a) If there is no short circuit:
 - remove the DEU-A (200RH25) (Ref. AMM TASK 23-73-46-000-001)

 - install the DIR-CIDS (101RH) and DIR-CIDS (102RH) (Ref. AMM TASK 23-73-34-400-001).

 - close these CBs: 49VU: 154RH COM/CIDS/DEU A ESS/LINE 1 49VU: 155RH COM/CIDS/DEU A ESS/LINE 2 121VU: 167RH COM NAV/CIDS/DEU A NORM/L AFT 121VU: 165RH COM NAV/CIDS/DEU A NORM/L MID 121VU: 163RH COM NAV/CIDS/DEU A NORM/L FWD

 「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 : 001-049, 051-099, 101-105, 201-299, ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page 286
 Aug 01/05 CES

 - do the CIDS BITE test through the MCDU/CFDS (Ref. AMM TASK 23-73-00-740-005).
 1 If the CIDS BITE test gives the maintenance message DEU-A
_
 200RH25:

 - install a new DEU-A (200RH25) (Ref. AMM TASK 23-73-46-400-001).
 2 If the CIDS BITE test gives the maintenance message CIDS TOP
_
 LINE 1 L:

 - install the removed DEU-A (200RH25) (Ref. AMM TASK 23-73-46-400-001).

 - do the steps 4. B. (5) (a) again for the subsequent DEUs until the maintenance message stops: (Ref. ASM 23-73/06) DEU-A (200RH21) DEU-A (200RH17) DEU-A (200RH13) DEU-A (200RH9) DEU-A (200RH5) DEU-A (200RH1)

 (b) If there is a short circuit:
 - remove the DEU-A (200RH25) (Ref. AMM TASK 23-73-46-000-001)

 - do a check for a short circuit again.

 1 If there is no short circuit:
_
 - install a new DEU-A (200RH25) (Ref. AMM TASK 23-73-46-400-001).
 2 If the fault continues:
_
 - disconnect the electrical connector 7253VC3 from the DEU mount 2014VU3 (Ref. AMM TASK 23-73-48-000-001).

 - do a check for a short circuit again.

 a If there is no short circuit:
_
 - install a new DEU mount 2014VU3 (Ref. AMM TASK 23-73-48-000-001) and (Ref. AMM TASK 23-73-48-400-001).
 b If the fault continues:
_
 - remove the DEU-A (200RH21) (Ref. AMM TASK 23-73-46-000-001)

 - do a check for a short circuit again.

 - b.1. If there is no short circuit:

 - install a new DEU-A (200RH21) (Ref. AMM TASK 23-73-46-400-001).

 - b.2. If the fault continues:

 - install the removed DEU-A (200RH25) (Ref. AMM TASK 23-73-46-400-001),

 - reconnect the electrical connector to the DEU mount 2014VU3 (Ref. AMM TASK 23-73-48-400-001),

 「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 : 001-049, 051-099, 101-105, 201-299, ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page 287
 Aug 01/05 CES

 - disconnect the electrical connector 7213VC21 from the DEU mount 2010VU21 (Ref. AMM TASK 23-73-48-000-001),

 - do a check for a short circuit again.

 - b.2.1. If there is no short circuit:

 - do a check for a short circuit at the connector 7213VC21 between pin 9 and GND (pin 11) and between pin 10 and GND (pin 11).

 - b.2.1.1. If there is a short circuit:

 - repair the wiring between the DEU mount 2010VU21 and the DEU mount 2014VU3 (Ref. ASM 23-73/06).

 - b.2.1.2. If there is no short circuit:
　
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