W DOC AIRBUS | TSM A320F

DEU-B - Fault in DEU-B 300RHx with connected systems/devices

TASK 23-73-00-810-827-A
DEU-B - Fault in DEU-B 300RHx with connected systems/devices

1. Possible Causes
  • DIR-CIDS, 1 [101RH]
  • short circuit between the related DEU-B (300RHx) and the connected devices
  • DEU-B (300RHx)
  • DEU mount 2011VUx
  • wiring
  • Connection Box 308RHx
  • Termination Box 309RHx
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-73-00-710-035
Operational Test of the Cabin LED lamps through the MCDU
AMM 23-73-00-740-005
BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
ASM 237324
ASM 237325
ASM 237326
ASM 237327
AMM 23-73-34-400-001
Installation of the CIDS Director
AMM 23-73-42-000-001
Removal of the Connection Box (208RH,308RH)
AMM 23-73-42-400-001
Installation of the Connection Box (208RH,308RH)
AMM 23-73-43-000-001
Removal of the Termination Box (209RH,309RH)
AMM 23-73-43-400-001
Installation of the Termination Box (209RH,309RH)
AMM 23-73-47-000-001
Removal of the Decoder/Encoder Unit B (300RH)
AMM 23-73-47-400-001
Installation of the Decoder/Encoder Unit B (300RH)
AMM 23-73-48-000-001
Removal of the DEU A/DEU B - Mount
AMM 23-73-48-400-001
Installation of the DEU A/DEU B - Mount
3. Fault Confirmation
Subtask 23-73-00-710-051-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the CIDS/DEU-B test through the CFDS (via CIDS1).
Subtask 23-73-00-710-051-B ** ON A/C NOT FOR ALL
A. Test
   (1) Do the CIDS Interface and Power-Up test through the CFDS.
AMM 23-73-00-740-005
   (2) Do the operational test of the cabin LED lamps through the CFDS.
AMM 23-73-00-710-035
4. Fault Isolation
Subtask 23-73-00-810-052-A
A. If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.
Subtask 23-73-00-810-088-D ** ON A/C NOT FOR ALL
B. If the CIDS1/DEU-B test gives the maintenance message DEU-B 300RHx:
  • Make sure that at least one cabin door is open.
  • Make sure that the EMER LT (4WL) switch is in the OFF position.
  • Open these CBs:
    49VU: 150RH COM DIR ESS/1,
    49VU: 157RH COM DIR ESS/2,
    121VU: 151RH CIDS/DIR NORM/1,
    121VU: 156RH CIDS/DIR NORM/2.
  • Wait for approx. 10s and close the CBs 156RH and 157RH.
  • Stop for approx. 120s,
  • Do the CIDS/DEU-B test (via CIDS2).
   (1) If the CIDS2/DEU-B test is OK:
   (2) If the fault continues:
     (a) If the coding switch(es) is (are) not in the correct position:
  • Make an adjustment of the related coding switch(es).
     (b) If the coding switch(es) is (are) in the correct position:
  • Do a check for short circuit between the related DEU-B (300RHx) and the connected devices.
   (3) If the fault continues:
   (4) If the fault continues:
   (5) If the fault continues:
  • Do a check of the wiring for:
    28VDC at DEU mount 2011VUx connector A/8
    28VDC at DEU mount 2011VUx connector A/5
    GND at DEU mount 2011VUx connector A/4
    ASM 237324, ASM 237325, ASM 237326 and ASM 237327
Subtask 23-73-00-810-088-F ** ON A/C NOT FOR ALL
B. If there is confirmation of the fault:
   (1) If the coding switch(es) is (are) not in the correct position:
  • Make an adjustment of the related coding switch(es).
   (2) If the coding switch(es) is (are) in the correct position:
  • Do a check for short circuit between the related DEU-B (300RHx) and the connected devices.
   (3) If the fault continues:
   (4) If the fault continues:
   (5) If the fault continues:
Subtask 23-73-00-810-491-A ** ON A/C NOT FOR ALL
C. Install the removed DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
Subtask 23-73-00-710-223-A
D. Do the test given in Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:25:49 UTC
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