- do a resistance check of the harnesses J5 and J6 (Ref. AWM 71-51-05) between: . pins 21 and 22 (>10 megohms) . pins 21 and 11 (>10 megohms) . pin 21 and the ground (>10 megohms).

 (a) If the resistance values are out of the specified limits:
 - with the thrust-reverser blocker doors in the stowed position, disconnect the harnesses J5 and J6 from each deploy switch,

 - do a resistance check on each deploy switch (Ref. AWM 71-51-05) between: . pins 3 and 2 (>10 megohms) . pins 4 and 5 (>10 megohms) . pins 4 and 1 (>10 megohms) . pin 4 and the ground (>10 megohms).

 1_ If the resistance values are out of the specified limits:
 - Inspect the deploy switches levers (Ref. AMM TASK 78-31-17-
210-040).
 - If the finding do not indicate mechanical problem, replace
 the defective:
 . SW-BLOCKER DOOR DEPLOY, L (4103KS1) or/and
 . SW-BLOCKER DOOR DEPLOY, R (4103KS2) (Ref. AMM TASK 78-31-
17-000-040) and (Ref. AMM TASK 78-31-17-400-040).

 2 If the resistance values are in the specified limits:
_
 - do a continuity and insulation check of the thrust reverser and harnesses J5 and J6 between the deploy switches including the junction box (4100KS) (Ref. ASM 73-25/16),

 - do a visual check of each connector for correct condition.

 a If damage is found:
_ - repair or replace as required.
 b If nothing is found:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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 (b) If the resistance values are in the specified limits:
 - do a manual deployment of the thrust-reverser blocker doors (Ref. AMM TASK 78-32-41-860-001)

 - do a resistance check of the harnesses J5 and J6 (Ref. AWM 71-51-05) between: . pins 21 and 22 (<5 ohms) . pins 21 and 11 (>10 megohms) . pin 21 and the ground (>10 megohms).

 1 If the resistance values are out of the specified limits:
_
 - with the thrust-reverser blocker doors in the stowed position, disconnect the harnesses J5 and J6 from each deploy switch,

 - do a resistance check on each deploy switch (Ref. AWM 71-51-05) between: . pins 3 and 2 (<5 ohms) . pins 4 and 5 (<5 ohms) . pins 4 and 1 (>10 megohms) . pin 4 and the ground (>10 megohms).

 a If the resistance values are out of the specified limits:
_
 - Inspect the deploy switches levers (Ref. AMM TASK 78-31-17-210-040).

 - If the finding do not indicate mechanichal problem, replace the defective: . SW-BLOCKER DOOR DEPLOY, L (4103KS1) or/and . SW-BLOCKER DOOR DEPLOY, R (4103KS2) (Ref. AMM TASK 78-31-17-000-040) and (Ref. AMM TASK 78-31-17-400-040).

 b If the resistance values are in the specified limits:
_
 - do a continuity and insulation check of the thrust reverser and harnesses J5 and J6 between the deploy switches including the junction box (4100KS) (Ref. ASM 73-25/16),

 - do a visual check of each connector for correct condition.

 c If damage is found:
_
 - repair or replace as required.
 d If nothing is found:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 2 If the resistance values are in the specified limits:
_
 - do a continuity and insulation check of the thrust reverser and harnesses J5 and J6 between the stow switches including the junction box (4100KS) (Ref. ASM 73-25/16),

 - do a visual check of each connector for correct condition.

 a If damage is found:
_
 - repair or replace as required.
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 b If nothing is found:

_
 - 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 DEPL SW, J5/J6, ECU:
 - do a check of the connectors of the thrust reverser harness and harnesses J5 and J6 for looseness, contamination, and bent pins.
 (a) If damage is found:

 - retighten, clean or repair as required (Ref. AMM TASK 78-31-42-210-041).

 (b) If nothing is found:

 - do a check of the harness routing and look for chafing or cut in the harness envelope.
　
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