1 If harness connector or ECU receptacle is damaged:
_ - repair or replace as required.

 2 If no damage is found:
_

 - do an electrical resistance test through the HJ9 harness between: . pins 5 and 13 (<1 ohm) . pins 5 and 14 (<1 ohm) . pins 5 and 15 (<1 ohm) . pins 5 and 4 (>10 megohms) . pins 13 and 4 (>10 megohms) . pins 14 and 4 (>10 megohms) . pins 15 and 4 (>10 megohms) . pin 5 and the ground (>10 megohms).
 a If the resistance values are out of the specified limits:
_

 - replace the HJ9 harness (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042).
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 b If the resistance values are in the specified limits:

_

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 **ON A/C ALL

 B. Do the test given in Para. 3.A.
 (1) No additional maintenance action is required if the fault is not confirmed.

 (2) Repeat the fault isolation procedure if the fault continues.

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 TASK 77-10-00-810-839

 Loss of the Alternator Power Supply on Engine 1 - Channel B
 1. Possible Causes
_______________

 - ECU (4000KS)

 - alternator stator

 - HJ10 harness

 - alternator rotor

 - AGB

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 72-63-00-000-003 Removal of the Accessory Gearbox Assembly AMM 72-63-00-400-003 Installation of the Accessory Gearbox Assembly AMM 73-21-30-000-001 Removal of the Control Alternator AMM 73-21-30-400-001 Installation of the Control Alternator AMM 73-21-50-000-043 Removal of the HJ10 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-043 Installation of the HJ10 Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
 Engine Motoring) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine Non motoring) AMM 79-21-10-210-002 Check of the Lubrication Unit Magnetic Plugs and Screens
 3. Fault Confirmation
__________________

 **ON A/C 001-049, 056-056, 058-058, 061-099, 101-105, 151-199, 201-211,
 A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
R **ON A/C 051-055, 057-057, 059-060, 106-149, 212-299, 301-399, 401-499,
 A. Do the operational test of the FADEC 1B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
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 **ON A/C ALL
 4. Fault Isolation
_______________

R **ON A/C 001-049, 056-056, 058-058, 061-099, 101-105, 151-199, 201-211,
 A. This fault is generated if the ECU detects an open or short circuit on one or more alternator windings and N2 is greater than 58.8% (min idle).
 NOTE : A possible cause of the message failure____ALT, J10, ECU may be the result of a short circuit through J10 wires which can produce an ECU power supply deterioration. The troubleshooting steps must be performed as specified hereunder.
 (1) If the failure message ALT, J10, ECU is not confirmed:
 - do a check of the AGB lubrication unit magnetic plug and screen for particles (Ref. AMM TASK 79-21-10-210-002).
 (a) If particles are found:
 - replace the AGB (Ref. AMM TASK 72-63-00-000-003) and (Ref. AMM TASK 72-63-00-400-003).
 1 Inspect alternator stator and rotor for contact, replace as
_ required (Ref. AMM TASK 73-21-30-000-001) and (Ref. AMM TASK 73-21-30-400-001).
　
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