R (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 with the SHED indication shown in amber on the right of the AC ESS busbar. On the upper ECAM display unit:
 - the AC ESS BUS SHED indication comes into view.
 2. On the panel 11VU, on the MCDU1: On the panel 11VU:
 - Adjust the brightness of the  - the MCDU1 is on.
 MCDU screen.

 3. On the panel 25VU:  On the overhead panel:
 - set the ANN LT switch to TEST.  - all the annunciators come on with maximum brightness.
 4. Fault Isolation
_______________
 A. If the test confirms the fault:
 - replace the RELAY-BUS 801XP CTL (7XH).
 (1) If the fault continues:
 - do a check of the status of the circuit breaker (6XH).
 (a) If the circuit breaker is open:
 - close it.
 1 If it trips:
_
 - replace the C/B - ELEC/AC BUS/8XP/MONG (6XH).
 2 If the fault continues:
_
 - do a check and repair the wiring : . between the circuit breaker (6XH) and the pin X of the relay (7XH) and . between the pin Z of the relay (7XH) and the ground (Ref. ASM 24-52/01).
 (b) If the circuit breaker is closed:
 - do a check and repair the wiring between the pin B of the relay (7XH) and the pin D/5D of the SDAC1 and 2.

 B. Do this test to make sure that the system operates correctly.
 -------------------------------------------------------------------------------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.
 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.
R  (2) On the MCDU1, Fully decrease the brightness of the MCDU screen (display off).
 (3) De-energize the aircraft electrical circuits
 (Ref. AMM TASK 24-41-00-862-002).

 TASK 24-50-00-810-802
 Loss of the AC Essential Sheddable Busbar
 1. Possible Causes
_______________
 - CNTOR-AC SHED ESS BUS (8XH)

 - RECTIFIER-AC SHED ESS BUS CNTOR (9XH)

 - wiring

 - C/B-CNTOR SPLY (1XH)

 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 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power AMM 24-52-51-000-001 Removal of the Essential 115/26VAC Autotransformer (5XH) AMM 24-52-51-400-001 Installation of the Essential 115/26VAC
 Autotransformer (5XH) AMM 24-52-55-000-001 Removal of the AC Shed Essential Bus Contactor (8XH) AMM 24-52-55-400-001 Installation of the AC Shed Essential Bus Contactor
 (8XH) AMM 31-60-00-860-001 EIS Start Procedure ASM 24-52/01
 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).

 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AUTO FLT/MCDU/1 11CA1 B01 49VU LIGHTING/XFMR/115V.5V/ESS BUS 29LP H03 122VU LIGHTING/TST/BOARD/SPLY 30LP X06
 C. Test
R (1) Do this test:
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the ECAM control panel:
- push the ELEC key to get the ELEC page.
2. On the panel 11VU, on the MCDU1:
- Fully decrease the brightness of the MCDU screen (display off).
　
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