W DOC AIRBUS | TSM A320F

DIR 2 - Loss of essential power (28VDC1 SPLY)

TASK 23-73-00-810-967-A
DIR 2 - Loss of essential power (28VDC1 SPLY)

1. Possible Causes
  • C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH]
  • DIR-CIDS, 2 [102RH]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-73-00-740-005
BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
ASM 237306
AMM 23-73-34-000-001
Removal of the CIDS Director
AMM 23-73-34-400-001
Installation of the CIDS Director
3. Fault Confirmation
Subtask 23-73-00-865-050-A ** ON A/C NOT FOR ALL
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUCOM/CIDS/DIR ESS/2157RHG02
** ON A/C NOT FOR ALL
49VUCOM DIR ESS/2157RHG02
Subtask 23-73-00-700-057-A ** ON A/C NOT FOR ALL
B. Do the CIDS Interface and Power-Up test through the CFDS AMM 23-73-00-740-005
   (1) If you cannot close the circuit breaker 157RH, go to Para 4. B.
4. Fault Isolation
Subtask 23-73-00-810-755-A ** ON A/C NOT FOR ALL
A. If the circuit breaker C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] is closed and the test confirmes the fault:
   (1) If there is 28 VDC:
   (2) If there is no 28 VDC:
  • do a check for 28 VDC at the C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] .
     (a) If there is 28 VDC:
  • open the C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] .
  • do a check of the wiring between the:
    DIR-CIDS, 2 [102RH] connector AC/1 and C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH]
    ASM 237306 and ASM 237306.
     (b) If there is no 28 VDC:
  • install a new C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] .
  • install the DIR-CIDS, 2 [102RH] .
Subtask 23-73-00-810-756-A ** ON A/C NOT FOR ALL
B. If the circuit breaker C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] is open:
  • close this circuit breaker.
   (1) If the circuit breaker C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] trips:
     (a) If there is a short to ground:
  • repair the wiring .
     (b) If there is no short to ground:
  • close the circuit breaker C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] .
       1 If the circuit breaker C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] trips:
  • replace the C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] .
       2 If the circuit breaker C/B-COM/CIDS/DIR ESS/2 or C/B-COM DIR ESS/2 [157RH] stays closed:
5. Close-up
Subtask 23-73-00-942-053-A ** ON A/C NOT FOR ALL
A. Do the test given in Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:26:01 UTC
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