- repair or replace as necessary.

 (2) If mothing is found:

 - Perform a manual deployment of the blocker door (Ref. AMM TASK 78-32-41-860-001)

 - Do a general visual inspection of the blocker door latches, hinges and adjacent structure (Ref. AMM TASK 78-31-19-210-041).

 (a) If damage is found:

 - repair or replace as necessary.

 (b) If nothing is found:

 - Do a general visual inspection of blocker door actuator rod end attachments (Ref. AMM TASK 78-31-41-210-042)
 1 If damaged is found:
_ - repair or replace as necessary.
 2 if nothing is found:
_
 - Do a detailed visual inspection of the electrical harness (Ref. AMM TASK 78-31-42-210-041)
 a If damage is found:
_ - repair or replace as necessary.
 b if nothing is found:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) (Ref. AMM TASK 73-21-60-400-001)
 * If the fault continues, replace the HCU (4101KS) (Ref. AMM TASK 78-31-51-000-042) (Ref. AMM TASK 78-31-51-400-042).
 B. Do the test given in Para. 3.A.
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 TASK 78-31-00-810-877
 Thrust Reverser HCU Pressure-Switch Failed Open on Engine 1
 1. Possible Causes
_______________
 - PRESS SW-HCU (4102KS)

 - harness J5

 - harness J6

 - thrust reverser harness

 - junction box

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-51-44-000-002 Removal of the Thrust Reverser Harness 238W0908 AMM 71-51-44-400-002 Installation of the Thrust Reverser Harness 238W09098 AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit
 (ECU)(4000KS) AMM 78-31-00-710-040 Operational Test of the Thrust Reverser System AMM 78-31-16-000-040 Removal of the Hydraulic Control Unit Pressure Switch
 (4102KS) AMM 78-31-16-400-040 Installation of the Hydraulic Control Unit Pressure Switch (4102KS) ASM 73-25/16
 3. Fault Confirmation
__________________
 A. Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-040).
 4. Fault Isolation
_______________
 A. This fault message is generated if there is an HCU pressure switch failed in the open position.
 (1) If the test gives the maintenance message TR PR SW, J5+J6, ECU:
 - get access to the HCU,

 - disconnect the harnesses J5 and J6 from the HCU pressure switch (4102KS),

 - install jumper wires between pins 2 and 3 on the harness J5 connector and between pins 4 and 5 on the harness J6 connector,

 - disconnect the harnesses J5 and J6 from the ECU (4000KS) and do a resistance check at each harness connector to the ECU (Ref. ASM 73-25/16) between:

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 . pins 12 and 13 (<5 ohms)
 . pins 12 and 11 (>10 megohms)
 . pin 12 and the ground (>10 megohms).
 (a) If the resistance values are in the specified limits:

 - replace the PRESS SW-HCU (4102KS) (Ref. AMM TASK 78-31-16-000-040) and (Ref. AMM TASK 78-31-16-400-040).

 (b) If the resistance values are out of the specified limits:

 - do a continuity and insulation check of the harnesses between the ECU and the HCU pressure switch,

 - repair or replace the defective harness J5 or harness J6 or thrust reverser harness or junction box (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002).

 (c) 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).
 (2) If the test does not give the maintenance message TR PR SW, J5+J6, ECU; this is indicative of an intermittent fault that may be caused by defective electrical contacts in the harnesses and junction box between the ECU and the HCU:
 - do a check of the harnesses J5 and J6 and the thrust reverser harnesses and the junction box between the ECU and the HCU for correct condition,
　
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