(3) On the panel 301VU, set the ND potentiometer to OFF.

 (4) On the ECAM control panel, set the LOWER DISPLAY potentiometer to OFF.

 TASK 34-11-00-810-867
 Mechanic Call Horn Inoperative
 1. Possible Causes
_______________
 - LGCIU-1 (5GA1)

 - RELAY-ADIRS ON BAT/GROUND WARN (12FP)

 - wiring of the ADIRS ON BAT/GROUND WARN relay (12FP)

 - RELAY-ADIRS LGCIU GND POS (23FP)

 - wiring of the ADIRS LGCIU ground position relay (23FP)

 - RELAY-HORN SUPPLY RESET (8WC)

 - wiring of the horn supply reset relay (8WC)

 - wiring of the diode module (1160VD)

 - DIODE MODULE (1160VD)

 - HORN-MECH CALL (15WC)

 - RELAY-HORN SUPPLY (4WC)

 - wiring of the horn supply relay (4WC)

 - C/B-EIS/HORN/SPLY (2WC)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-42-00-710-001 Operational Test of the Mechanic Call
 AMM 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
 AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
 AMM 34-11-00-710-002 Test of the Monitoring of the ADIRS Power Supply

 (115VAC-28VDC)
 ASM 23-42/01
 ASM 34-11/01

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the test of the monitoring of the ADIRS power supply (115VAC-28VDC) (Ref. AMM TASK 34-11-00-710-002).
 (a) Make sure that the mechanic call horn operates and that the ADIRU & AVNCS VENT light comes on:
 - when the ADIRU1 is de-energized

 - when the ADIRU2 is de-energized

 - when the ADIRU3 is de-energized.

 「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 ∞∞34-11-00∞∞∞∞∞∞∞∞∞∞Page A219
 May 01/05R CES

 4. Fault Isolation
_______________

 A. If during the test:
 - the mechanic call horn does not operate

 - the ADIRU & AVNCS VENT light does not come on: . replace the RELAY-ADIRS ON BAT/GROUND WARN (12FP).

 (1) If the fault continues:
 - do a check of the wiring of the ADIRS ON BAT/GROUND WARN relay (12FP): . pin A/2 to the ground point . pin A/1 to the first terminal block . pin A/X1 to the first terminal block . pin A/X2 to ADIRS LGCIU ground position relay (23FP) pin A/A (Ref. ASM 34-11/01).
 (a) If there is no continuity:

 - repair the above wiring.

 (b) If there is continuity:

 - replace the RELAY-ADIRS LGCIU GND POS (23FP).
 1_ If the fault continues:
 - do a check of the wiring of the ADIRS LGCIU ground position
 relay (23FP):
 . pin A/1 to the ground point
 . pin A/Z to the ground point
 . pin A/X to LGCIU (5GA1) pin AA/10A.

 a If there is no continuity:
_ - repair the above wirings.
 b If there is continuity:
_
 - replace the LGCIU-1 (5GA1) (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
 B. If during the test:
 - the mechanic call horn does not operate

 - the ADIRU & AVNCS VENT light comes on: . do the operational test of the mechanic call (Ref. AMM TASK 23-42-00-710-001).

 (1) If the mechanic call horn operates correctly:
 - replace the RELAY-HORN SUPPLY RESET (8WC).
 (a) If the fault continues:
 - do a check of the wiring of the horn supply reset relay (8WC): . pin A/1 to the first terminal block . pin A/A to diode module (1160VD) pin A/26 (Ref. ASM 23-42/01) and (Ref. ASM 34-11/01).
 「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 ∞∞34-11-00∞∞∞∞∞∞∞∞∞∞Page A220
 May 01/05R
 CES  1 If there is no continuity:

_ - repair the above wiring.
 2 If there is continuity:
_
 - do a check of the wiring of the diode module (1160VD): pin A/11 to the first terminal block (Ref. ASM 34-11/01).
 a If there is no continuity:
_ - repair the above wiring.
 b If there is continuity:
_
 - replace the DIODE MODULE (1160VD).
 (2) If the mechanic call horn does not operate:
 - replace the HORN-MECH CALL (15WC).
 (a) If the fault continues:
　
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