TASK 35-10-00-810-820
 REGUL LO PR Indication with no Oxygen Pressure Value on the DOOR/OXY Page
 1. Possible Causes
_______________
 - XMTR/PRESS REG-OXY (4HT)

 - SOL VALVE-LP OXY SPLY (3HT)

 - C/B-OXYGEN/CREW/OXY/SPLY (1HT)

 - wiring from the circuit breaker (1HT) pin 2 to the first terminal block

 - P/BSW-OXYGEN/CREW SUPPLY (2HT)

 - short to ground at the wiring between the circuit breaker (1HT) pin 2 and the first terminal block

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power AMM 31-60-00-860-001 EIS Start Procedure AMM 35-13-15-000-001 Removal of the Oxygen Pressure Regulator/Transmitter
 (4HT)
 AMM 35-13-15-400-001 Installation of the Oxygen Pressure

 Regulator/Transmitter (4HT) AMM 35-13-51-000-001 Removal of the Sol Valve-LP Oxy Sply (3HT) AMM 35-13-51-400-001 Installation of the LP Oxygen-Supply Solenoid-Valve
 (3HT)
 ASM 35-13/01

 3. Fault Confirmation
__________________
 A. Job Set Up
 (1) Aircraft Maintenance Configuration
 (a) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

 (b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).

 (c) On the panel 21VU push the OXYGEN/CREW SUPPLY pushbutton switch (the OFF legend goes off).

 「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 : ALL ∞∞35-10-00∞∞∞∞∞∞∞∞∞∞Page 235
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 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU OXYGEN/CREW/OXY/SPLY 1HT HA01
 C. Test
 (1) On the ECAM control panel:

 - push the DOOR key to get the DOOR/OXY page:

 (2) Make sure that the REGUL LO PR indication comes into view and the oxygen pressure indication is replaced by amber crosses on the DOOR/OXY page.

 (3) If the circuit breaker (1HT) trips:

 - refer to Para. 4.A.(2).
 4. Fault Isolation
_______________
 A. If the test confirms the fault:
 - do a check for the circuit breaker (1HT) status:
 (1) If the circuit breaker is closed

 - do a check for continuity between the circuit breaker (1HT) pin 2 and the first terminal block (Ref. ASM 35-13/01).
 (a) If there is continuity:

 - replace the C/B-OXYGEN/CREW/OXY/SPLY (1HT) (Ref. ASM 35-13/01).

 (b) If there is no continuity:

 - repair the wiring from the circuit breaker (1HT) pin 2 to the first terminal block (Ref. ASM 35-13/01).

 (2) If the circuit breaker (1HT) is open:

 - close it.
 (a) If it trips:
 - replace the XMTR/PRESS REG-OXY (4HT) (Ref. AMM TASK 35-13-15-000-001) and (Ref. AMM TASK 35-13-15-400-001).
 1 If the fault continues:
_
 - replace the SOL VALVE-LP OXY SPLY (3HT) (Ref. AMM TASK 35-13-51-000-001) and (Ref. AMM TASK 35-13-51-400-001).
 2 If the fault continues:
_
 - replace the P/BSW-OXYGEN/CREW SUPPLY (2HT).
 「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 : ALL ∞∞35-10-00∞∞∞∞∞∞∞∞∞∞Page 236
 May 01/05R
 CES  a If there is a short to ground:

 3_ If the fault continues:
 - do a check for a short to ground at the wiring between the
 circuit breaker (1HT) pin 2 and the first terminal block
 (Ref. ASM 35-13/01).

_
 - repair the above wiring. b If there is no short to ground:
_
 - replace the C/B-OXYGEN/CREW/OXY/SPLY (1HT) (Ref. ASM 35-13/01).
 (b) If the circuit breaker is held closed and if the fault continues.
 - replace the XMTR/PRESS REG-OXY (4HT) (Ref. AMM TASK 35-13-15-000-001) and (Ref. AMM TASK 35-13-15-400-001).
 1 If the fault continues:
_
 - replace the SOL VALVE-LP OXY SPLY (3HT) (Ref. AMM TASK 35-13-51-000-001) and (Ref. AMM TASK 35-13-51-400-001).
　
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