(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: 193RH COM NAV/CIDS/DEU B/NORM FWD
2001VU: 194RH DEU B/NORM AFT
- 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).
(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)
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page A265
Aug 01/05R
CES (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: 193RH COM NAV/CIDS/DEU B/NORM FWD 2001VU: 194RH DEU B/NORM AFT
- 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),
- 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:
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞23-73-00∞∞∞∞∞∞∞∞∞∞Page A266
Aug 01/05R CES
- 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).
- b.1.1. If there is a short circuit:
- repair the wiring between the DEU CONNECTION BOX (308RH5) and the DEU TERMINATION BOX (309RH1) (Ref. ASM 23-73/06).
- b.1.2. If there is no short circuit:
- install a new DEU CONNECTION BOX (308RH5) (Ref. AMM TASK 23-73-42-000-001) and (Ref. AMM TASK 23-73-42-400-001).
- b.2. If there is a short circuit:
- reconnect the electrical connector to the DEU CONNECTION BOX (308RH5),
- do the steps (4. B. (5) (b) 2 b) again for the subsequent DEU(s) and DEU CONNECTION BOX(es) until the maintenance message stops for: DEU CONNECTION BOX (308RH3) DEU-B (300RH1) and DEU CONNECTION BOX (308RH1).
(6) If the resistance (line to line) is more than 140 ohms (open circuit):
- disconnect the electrical connector DEU TERMINATION BOX (309RH1) (Ref. ASM 23-73/06),
- make sure that the resistance (line to line) is not more than 140 ohms (open circuit) between: DEU TERMINATION BOX (309RH1) pin A/1 and pin A/2
(a) If there is an open 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 there is no open circuit:
- reconnect the electrical connector to the DEU TERMINATION BOX (309RH1).
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本文链接地址：A320 Trouble Shooting Manual 排故手册 COMMUNICATIONS 通讯2(103)
