W DOC AIRBUS | TSM A320F

No EFIS Data with EIS DMC Selector Switch at CAPT/3 and/or F/O/3

TASK 31-63-00-810-969-A
No EFIS Data with EIS DMC Selector Switch at CAPT/3 and/or F/O/3

1. Possible Causes
  • SEL SW-EIS DMC [18WT]
  • wiring of the EIS DMC Selector Switch (18WT)
  • wiring from the DMC3 (1WT3) pin AC/7 to the ground terminal
  • RELAY-BUS1 TO ESS BUS SWTG, DMC3 [26WT]
  • C/B-EIS/DMC3/STBY/SPLY [14WT1]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 316102
AMM 31-63-34-000-001
Removal of the DMC
AMM 31-63-34-400-001
Installation of the DMC
ASM 316802
3. Fault Confirmation
Subtask 31-63-00-700-050-A
A. Not applicable, the fault is evident.
4. Fault Isolation
Subtask 31-63-00-810-217-A
A. If there is no EFIS Display with EIS DMC Selector Switch (18WT) at CAPT/3:
   (1) If there is no ground signal:
  • replace the SEL SW-EIS DMC [18WT] .
     (a) If there is no ground signal:
  • do a check and repair the wiring of the EIS DMC Selector Switch (18WT):
    pin 2 to the DMC3 pin AB/4C ASM 316802.
   (2) If there is a ground signal:
  • refer to the trouble shooting procedure related to the DMC3 maintenance message.
Subtask 31-63-00-810-218-A
B. If there is no EFIS Display with EIS DMC Selector Switch (18WT) at F/O/3:
   (1) If there is no ground signal:
  • replace the SEL SW-EIS DMC [18WT] .
     (a) If there is no ground signal:
  • do a check and repair the wiring of the EIS DMC Selector Switch (18WT):
    pin 4 to the DMC3 pin AB/4H ASM 316802.
   (2) If there is a ground signal:
  • refer to the trouble shooting procedure related to the DMC3 maintenance message.
Subtask 31-63-00-810-219-A
C. If there is no EFIS Display with EIS DMC Selector Switch (18WT) at CAPT/3 and at F/O/3:
  • replace the SEL SW-EIS DMC [18WT]
   (1) If the fault continues:
  • do a check and repair the wiring of the EIS DMC Selector Switch (18WT):
    pin 1 to ground point ASM 316802.
   (2) If the fault continues:
  • do a check for 115VAC at pin AC/2 of the DMC3 (1WT3) ASM 316102.
     (a) If there is 115VAC:
  • refer to the trouble shooting procedure related to the DMC3 maintenance message.
     (b) If there is no 115VAC:
  • do a check for a ground signal at pin AC/7 of the DMC3 (1WT3).
       1 If there is no ground signal:
  • repair the wiring from the DMC3 (1WT3) pin AC/7 to the ground terminal.
       2 If there is a ground signal:
  • replace the RELAY-BUS1 TO ESS BUS SWTG, DMC3 [26WT] .
         a If the fault continues:
  • replace the C/B-EIS/DMC3/STBY/SPLY [14WT1]
    . If the fault continues:
    * do a check of the wiring from the DMC3 BUS1 to the ESS BUS SWTG relay (26WT):
    - pin A2 to DMC3 (1WT3) pin AC/2
    - pin A1 to the EIS/DMC3/STBY/SPLY circuit breaker (14WT1)
    - pin X2 to the BUS 1XP CTL relay (20XN1)
    * repair the wiring which has no continuity.
[Rev.8 from Aug 2018] 2026.04.04 04:30:50 UTC
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