- harness J7

 - Hydromechanical Unit (HMU)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU)
 AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU)
 AMM 73-21-50-000-040 Removal of the HJ7 Harness
 AMM 73-21-50-400-040 Installation of the HJ7 Harness
 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 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring) ASM 73-25/18
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message J7, HMU(LPTCTM), ECU:
 - do a check for open or short to ground at pins J7/19, 38, 39 of the harness J7 between the ECU (4000KS) and the LPT torque-motor current in the HMU, (Ref. ASM 73-25/18).
 (1) If the wiring is not correct:

 - repair the above wiring.

 (2) If the wiring is correct:

 - disconnect the harness J7 from the ECU and do a check of the ECU cable resistance between: . pins 19 and 38 (17 to 23 Ohms) . pins 19 and 39 (> 10 Megohms) . pin 19 and the ground (> 10 Megohms).
 F 『 EEFF : ALL E ∞∞73-29-00∞∞∞∞∞∞∞∞∞∞Page A275
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 F 『 E C F M E E E E 56 E E E (a) 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).
 (b) If the resistance values are out of the specified limits:
 - disconnect the harness J7 from the HMU and do a check of the HMU receptacle resistance between: . pins 19 and 38 (17 to 23 Ohms) . pins 19 and 39 (> 10 Megohms) . pin 19 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 2 If the resistance values are out of the specified limits:
_
 - replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 B. Do the test given in Para. 3.A.(1).
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 TASK 73-29-00-810-893
 Loss of LPTC Torque Motor Control through the Channel B on Engine 1
 1. Possible Causes
_______________
 - ECU (4000KS)

 - harness J8

 - Hydromechanical Unit (HMU)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU)
 AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU)
 AMM 73-21-50-000-041 Removal of the HJ8 Harness
 AMM 73-21-50-400-041 Installation of the HJ8 Harness
 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 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring) ASM 73-25/18
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message J8, HMU(LPTCTM), ECU:
 - do a check for open or short to ground at pins J8/19, 38, 39 of the harness J8 between the ECU (4000KS) and the LPT torque-motor current in the HMU, (Ref. ASM 73-25/18).
 (1) If the wiring is not correct:

 - repair the above wiring.

 (2) If the wiring is correct: