- remove the DIR-CIDS (101RH) (Ref. AMM TASK 23-73-34-000-001),
- close these CBs:
49VU: 157RH COM CIDS/DIR ESS/2,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS,
120VU: 156RH COM NAV/CIDS/DIR NORM/2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
- wait for approx. 120 s,
- do the CIDS2 Interface and Power-Up Test via the CFDS/MCDU.
(1) If the 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).
- during the installation of the DIR-CIDS, 1 (101RH) do not close these CBs: 49VU: 157RH COM CIDS/DIR ESS/2, 49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS, 120VU: 156RH COM NAV/CIDS/DIR NORM/2, 122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
- install the DIR-CIDS, 1 (101RH) (Ref. AMM TASK 23-73-34-400-001).
- do the CIDS1 Interface and Power-Up Test through the CFDS/MCDU.
(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: 153RH COM/CIDS/DEU B/ESS
121VU: 162RH COM NAV/CIDS/DEU B/NORM
- make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/D14 and connector AA/E14 is between approx. 80 and 140 ohms (Ref. ASM 23-73/06).
「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, 101-149, 201-299, ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page A257
401-499, Aug 01/05 CES (5) If the resistance (line to line) is between approx. 80 and 140 ohms:
- make sure that the resistance (line to GND) is not less than 7 k ohms (short circuit) between: DIR-CIDS (101RH) and (102RH) connector AA/D14 and GND, DIR-CIDS (101RH) and (102RH) connector AA/E14 and GND. (Ref. ASM 23-73/06)
(a) If there is no short circuit:
- remove the DECODER/ENCODER UNIT B (300RH7) (Ref. AMM TASK 23-73-47-000-001)
- install the DIR-CIDS (101RH) and DIR-CIDS (102RH) (Ref. AMM TASK 23-73-34-400-001).
- close these CBs: 49VU: 153RH COM/CIDS/DEU B/ESS 121VU: 162RH COM NAV/CIDS/DEU B/NORM
- do the CIDS Interface and Power-Up test through the CFDS/MCDU (Ref. AMM TASK 23-73-00-740-010).
1 If the test gives the maintenance message DEU-B 300RH7:
_
- install a new DECODER/ENCODER UNIT B (300RH7) (Ref. AMM TASK 23-73-47-400-001).
2 If the test gives the maintenance message CIDS MID BUS L/ DIR1
_
(101RH):
- install the removed DECODER/ENCODER UNIT B (300RH7) (Ref. AMM TASK 23-73-47-400-001).
- do the steps 4. B. (5) (a) again for the subsequent DEU(s) until the maintenance message stops: (Ref. ASM 23-73/06) DEU-B (300RH1)
(b) If there is a short circuit:
- remove the DECODER/ENCODER UNIT B (300RH7) (Ref. AMM TASK 23-73-47-000-001).
- do a check for a short circuit again.
1 If there is no short circuit:
_
- install a new DECODER/ENCODER UNIT B (300RH7) (Ref. AMM TASK 23-73-47-400-001).
2 If the fault continues:
_
- disconnect the electrical connector from the DEU TERMINATION BOX (309RH1) (Ref. ASM 23-73/06).
- do a check for a short circuit again.
a If there is no short circuit:
_
- install a new DEU TERMINATION BOX (309RH1) (Ref. AMM TASK 23-73-43-000-001) and (Ref. AMM TASK 23-73-43-400-001).
b If the fault continues:
_
- install the removed DECODER/ENCODER UNIT B (300RH7) (Ref. AMM TASK 23-73-47-400-001),
「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 : 106-149, 401-499, ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page A258
Aug 01/05 CES
- reconnect the electrical connector to the DEU TERMINATION BOX (309RH1),
- disconnect the electrical connector from the DEU CONNECTION BOX (308RH5),
- do a check for a short circuit again.
- b.1. If there is no short circuit:
- do a check for a short circuit at the disconnected connector between pin 9 and GND (pin 4) and between pin 10 and GND (pin 4). 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 COMMUNICATIONS 通訊2(99)
