B. Test
 (1) Do this test:
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the ECAM control panel:  On the lower ECAM display unit:
 - push the ELEC key to get the  - the normal configuration comes into
 ELEC page.  view (the AC2 busbar is shown in
 green).
 On the upper ECAM display unit:
 - the ELEC AC BUS2 FAULT warning comes
 into view.
 4. Fault Isolation_______________ 

R A. If the test confirms the fault: R
 - do a check of the status of the circuit breaker (17XN2).
 (1) If the circuit breaker is closed: R - replace the RELAY-BUS 2XP CTL (16XC).
R (a) If the fault continues:
R - replace the SDAC-2 (1WV2) (Ref. AMM TASK 31-55-34-000-001) and
R (Ref. AMM TASK 31-55-34-400-001).

R  1_  If the fault continues:
R  - replace the SDAC-1 (1WV1) (Ref. AMM TASK 31-55-34-000-001) 
R  and (Ref. AMM TASK 31-55-34-400-001). 

R a_ If the fault continues:R
 - do a check of the wiring between: . the pins D/5K of the SDAC1 and SDAC2 and the pin A/B2 of the relay (16XC) . the pin A/B3 of the relay (16XC) and the ground (Ref. ASM 24-25/01).
R * If there is no continuity:
R
R * - repair the above wiring.
R * If there is continuity:
R
R * - do a check and repair the wiring between:
R * . the pin A/X1 of the relay (16XC) and the circuit
R breaker (17XN2)
R * . the pin A/X2 of the relay (16XC) and the ground (Ref.

 ASM 24-25/01).
 「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 ∞∞24-50-00∞∞∞∞∞∞∞∞∞∞Page 222
 Feb 01/03 CES

 (2) If the circuit breaker is open: - close it.
 (a) If the circuit breaker trips: - replace the RELAY-BUS 2XP CTL (16XC). 
R R 1_  If the fault continues: - replace the RELAY-BUS 2XP CTL (20XN2). 
R R 2_  If the fault continues: - do a check for a short to ground at the wiring between the circuit breaker (17XN2) and respectively: . the pin A/X1 of the bus 2XP control relay (16XC) . the pin A/X1 of the bus 2XP control relay (20XN2) (Ref. ASM 24-25/01) and (Ref. ASM 24-51/03).
 a_ If the wiring is not correct: - repair it.
 b_ If the wiring is correct. - replace the C/B-ELEC/AC/BUS2/CTL (17XN2).
 B. Do this test to make sure that the system operates correctly:
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the ECAM control panel: - push the ELEC key to get the ELEC page.  On the lower ECAM display unit:- the normal configuration comes intoview.
 5. Close-up________
 A. Put the aircraft back to its initial configuration.
 (1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
 (2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

 TASK 24-50-00-810-808
 Failure of the AC BUS 1 with the External Power in Use
 1. Possible Causes_______________
R R R R  - BTC-1 (11XU1) - RELAY-EPC AUX CTL (5XG) - RELAY-GLC 1 AUX CTL (4XU1) - GLC-1 (9XU1) - RELAY-BUS TIE (30XU1) - wiring - C/B-ELEC/EXT PWR/CTL (11XG)
 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION -------------------------------------------------------------------------------
R  AMM AMM AMM AMM AMM ASM ASM ASM  24-22-55-000-001 24-22-55-400-002 24-41-00-861-002 24-41-00-862-002 31-60-00-860-001 24-22/0224-23/02 24-41/01 Removal of the Contactors (9XU1, 9XU2, 11XU1, 11XU2)Installation of the Contactors (9XU1, 9XU2, 11XU1, 11XU2)Energize the Aircraft Electrical Circuits from the External PowerDe-energize the Aircraft Electrical Circuits Supplied from the External PowerEIS Start Procedure
 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).

 B. Test

 (1) Do this test:
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
　
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