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 - replace the defective thrust reverser harness or harness J5 or harness J6 (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049).
 2 If nothing is found and the fault continues while the fault
_ message is never confirmed during the thrust reverser test:
 - replace the defective: . SW-BLOCKER DOOR STOW, UPPER R (4104KS1) or/and . SW-BLOCKER DOOR STOW, LOWER R (4104KS2) or/and . SW-BLOCKER DOOR STOW, LOWER L (4104KS3) or/and . SW-BLOCKER DOOR STOW, UPPER L (4104KS4) (Ref. AMM TASK 78-31-18-000-040) and (Ref. AMM TASK 78-31-18-400-040).
 a If the fault continues:
_
 - replace successively the harness J5 then the harness J6 then the thrust reverser harness (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049).
 b If the fault continues:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 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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 Thrust-Reverser Blocker-Door Deploy-Switches Feedback Disagree on Engine 1
 1. Possible Causes
_______________
 - SW-BLOCKER DOOR DEPLOY, L (4103KS1)

 - SW-BLOCKER DOOR DEPLOY, R (4103KS2)

 - ECU (4000KS)

 - thrust reverser harness

 - harness J5

 - harness J6

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  71-51-43-000-004 
AMM  71-51-43-000-044 
AMM  71-51-43-000-049 
AMM  71-51-43-400-004 
AMM  71-51-43-400-044 
AMM  71-51-43-400-049 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  78-31-00-710-042 
AMM  78-31-17-000-040 
AMM  78-31-17-210-040 
AMM  78-31-17-400-040 
AMM  78-31-42-210-041 
AMM  78-32-41-860-001 
ASM  73-25/16
 AWM  71-51-05

 3. Fault Confirmation
__________________
Removal of the ECU (Channel B) to Thrust Reverser
 Junction Box Harnesses (4214KS)
Removal of the Thrust Reverser (Channel A and B)
 Harness (4200KS)
Removal of the ECU (Channel A) to Thrust Reverser
 Junction Box Harnesses (4213KS)
Installation of the ECU (Channel B) to thrust
 Reverser Junction Box Harnesses (4214KS)
Installation of the Thrust Reverser (Channel A and B)
 Harness (4200KS)
Installation of the ECU (Channel A) to Thrust
 Reverser Junction Box Harnesses (4213KS)
Removal of the Electronic Control Unit (ECU)
Installation of the Electronic Control Unit (ECU)
Operational Test of the Thrust Reverser System
Removal of the Blocker Door Deploy Switch
 (4103KS1,4103KS2)
Detailed Visual Inspection of the Deploy Switches and
 Triggers
Installation of the Blocker Door Deploy Switch
 (4103KS1,4103KS2)
Detailed Visual Inspection of the electrical Harness
Manual Deployment of the Blocker Door

 A. Do the operational test of the thrust reverser system (1A and 1B) (Ref. AMM TASK 78-31-00-710-042).
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 4. Fault Isolation
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 A. This fault message is generated if there is a disagreement between channel A and channel B on the thrust-reverser blocker-door deploy switches signal. Most probable cause is deploy switches or a harness failure.
 (1) If the test gives the maintenance message DEPL SW, J5/J6, ECU on the channel A or B:
 - make sure that the thrust reverser blocker doors are in the stowed position,

 - disconnect the harnesses J5 and J6 from the ECU (4000KS),
　
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