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R  - do a functional test of the tachometer (Ref. AMM TASK 32-42-00-720-
R  002) or (Ref. AMM TASK 32-42-00-720-003). 
R  (a) if the test is OK: 
R  - Make sure that the splines of the tachometer are coated with 
R  grease before final assembly (Ref. AMM TASK 32-41-11-400-
R  006).No other maintenance action is necessary. 
R  (b) if the test confirms the fault: 
R  - replace the TACHOMETER-WHEEL 4 (22GG) (Ref. AMM TASK 32-42-57-
R  000-001) (Ref. AMM TASK 32-42-57-400-001) 
R  (5) If the fault continues: 
R  - do the trouble shooting procedure (Ref. TASK 31-32-00-810-933) 
R  related to the ANI-6 analog input signal of the SEC 2 COM and SEC 3 
R  COM (Ref. ASM 27-92/25). 
R  (6) If the fault continues: 
R  - do a check and repair the wiring from the tachometer (22GG) pins 
R  A/A,C to the first terminal block (Ref. ASM 32-42/02). 
R 
R  B. Do the functional test given in Para. 4.A.(4)

 TASK 32-42-00-810-817

 Loss of the Signal from the Tachometer (Wheel 1) to the BSCU
 1. Possible Causes
_______________
 - BSCU (10GG)

 - wiring from the BSCU (10GG) pins AB/5K, 5J to the first terminal block

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 32-42-00-720-002 Functional test of the tachometers
 AMM 32-42-00-720-003 Functional Test of the tachometers with the AIDS.
 AMM 32-42-34-000-001 Removal of the Braking/Steering Control Unit (BSCU)

 (10GG) AMM 32-42-34-400-001 Installation of the Braking/Steering Control Unit (BSCU) (10GG) ASM 32-42/02
 3. Fault Confirmation
__________________
 A. Test Do the functional test of the tachometer (Ref. AMM TASK 32-42-00-720-002) or (Ref. AMM TASK 32-42-00-720-003)
 4. Fault Isolation
_______________
 A. It the test confirms the fault:
 - do a check and repair the wiring from the BSCU (10GG) pins AB/5K, 5J to the first terminal block (Ref. ASM 32-42/02).
 (1) If the fault continues:
 - replace the BSCU (10GG) (Ref. AMM TASK 32-42-34-000-001) (Ref. AMM TASK 32-42-34-400-001).
 B. Do the functional test given in Para. 3.A.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞32-42-00∞∞∞∞∞∞∞∞∞∞Page 228
 May 01/05R
 CES  TASK 32-42-00-810-818

 1. Possible Causes
 Failure of the Tachometer (Wheel 1) _______________
 - DRIVE ASSY-TACHOMETER,WHEEL 1 (2681GM)

 - TACHOMETER-WHEEL 1 (19GG)

 - wiring from the tachometer (19GG) pins A/A,C to the first terminal block

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R  31-32-00-810-933 AMM 32-41-11-000-006  Failure of the Analog Links Removal of the MLG Wheel 
R R  AMM 32-41-11-400-006  (2649GM,2650GM,2651GM,2652GM) Installation of the MLG Wheel 
R  AMM 32-42-00-720-002  (2649GM,2650GM,2651GM,2652GM)Functional test of the tachometers
 AMM 32-42-00-720-003  Functional Test of the tachometers with the AIDS.
 AMM 32-42-57-000-001  Removal of the Tachometer
 AMM 32-42-57-400-001  Installation of the Tachometer
 AMM 32-42-68-000-003  Removal of the MLG Tachometer-Drive
 AMM 32-42-68-400-003  Installation of the MLG Tachometer-Drive
 ASM 27-92/25 ASM 32-42/02
 3. Fault Confirmation__________________ 
R R A. Not appplicable 
4. Fault Isolation_______________ 

R A. Remove the hubcap or the debris guard (if brake fans are installed) (Ref.
R AMM TASK 32-41-11-000-006).
R

R (1) Do a visual inspection of the tachometer drive mechanism and make
R sure that:
R - the tachometer drive shaft moves freely.
R - there is no deformation (twisting) and/or sign of friction on the
R drive shaft.
R - the splines of the tachometer drive shaft are in the correct
R condition.
R - the splines of the tachometer hubcap or the splines of the debris
　
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