W DOC AIRBUS | TSM A320F

Disagree between the OXY Indication on the SD page and the OFF legend on the Pushbutton Switch

TASK 35-10-00-810-816-A
Disagree between the OXY Indication on the SD page and the OFF legend on the Pushbutton Switch

1. Possible Causes
  • P/BSW- OXYGEN/CREW SUPPLY(2HT)
  • ground signal at pin A/A3 of the pushbutton switch (2HT)
  • P/BSW-OXYGEN/CREW SUPPLY (2HT)
  • wiring from the pushbutton switch (2HT) pin A/A2 to the first terminal block
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 351301
3. Fault Confirmation
Subtask 35-10-00-710-064-A
A. Test
Not applicable.
4. Fault Isolation
Subtask 35-10-00-810-065-A
A. If the OFF legend is on and the OXY indication is shown in white (DOOR/OXY Page)
  • replace the P/BSW- OXYGEN/CREW SUPPLY(2HT).
   (1) If the fault continues:
  • do a check of the wiring from the pushbutton switch (2HT) pin A/A2 to the first terminal block ASM 351301.
     (a) If there is no continuity:
  • repair the above wiring.
     (b) If there is continuity:
  • do a check and repair the ground signal at pin A/A3 of the pushbutton switch (2HT) ASM 351301.
Subtask 35-10-00-810-066-A
B. If the OXY indication is shown in amber (DOOR/OXY Page) and the OFF legend is off (pushbutton switch pushed).
  • replace the P/BSW-OXYGEN/CREW SUPPLY (2HT) >
   (1) If the fault continues
  • do a check and repair the wiring from the pushbutton switch (2HT) pin A/A2 to the first terminal block ASM 351301.
[Rev.8 from Aug 2018] 2026.04.04 04:33:37 UTC
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