W DOC AIRBUS | TSM A320F

Failure of the BSCU

TASK 32-42-00-810-929-A
Failure of the BSCU

1. Possible Causes
  • BSCU [10GG]
  • BOARD-ANN LT TEST & INTFC [1LP]
  • AUTO BRK/MAX pushbutton switch
  • wiring
  • AUTO BRK/LO pushbutton switch
  • Wiring
  • AUTO BRK/MED pushbutton switch
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 32-42-00-810-816-A
Failure of the Tachometer (Wheel 4)
TSM TASK 32-42-00-810-818-A
Failure of the Tachometer (Wheel 1)
TSM TASK 32-42-00-810-820-A
Failure of the Tachometer (Wheel 2)
TSM TASK 32-42-00-810-822-A
Failure of the Tachometer (Wheel 3)
ESPM 2045110
ASM 324203
AMM 32-42-34-000-001
Removal of the Braking/Steering Control Unit (BSCU)
AMM 32-42-34-400-001
Installation of the Braking/Steering Control Unit (BSCU)
AMM 32-46-00-00-
AMM 32-46-00-740-002
BITE Test of the BSCU - Ground Scanning
AMM 32-46-00-740-005
BITE Test of BSCU - Normal Braking TEST
AMM 33-14-33-000-001
Removal of the Annunciator-Light Test and Interface-Board
AMM 33-14-33-400-001
Installation of the Annunciator-Light Test and Interface-Board
TSM TASK 32-42-00-03
NORMAL BRAKING - TASK SUPPORTING DATA
3. Fault Confirmation
Subtask 32-42-00-740-186-B
A. Tests
   (1) Read the TROUBLE SHOOTING DATA of the BSCU on the MCDU 32-42-00-03 TSM TASK 32-42-00-03:
  • If the trouble shooting data gives fault code 185, refer to Para E.
  • If the trouble shooting data gives fault code 186, refer to Para F.
  • If the trouble shooting data gives fault code 187, refer to Para G.
   (2) If not, do the BITE test of the Normal Braking System AMM 32-46-00-740-005.
   (3) Do the GROUND SCANNING of the BSCU AMM 32-46-00-740-002.
   (4) Do a check of the CLASS 3 FAULTS of the BSCU AMM 32-46-00-00-.
4. Fault Isolation
Subtask 32-42-00-810-201-B ** ON A/C NOT FOR ALL
A. If the BITE test or the GROUND SCANNING gives the maintenance message BSCU (10GG), read the TROUBLE SHOOTING DATA and the CLASS 3 FAULTS of the BSCU (10GG) 32-42-00-03 TSM TASK 32-42-00-03.
   (1) If the trouble shooting data gives fault code 180, refer to Para C.
   (2) If the trouble shooting data gives fault code 181, refer to Para D.
   (3) If the trouble shooting data gives fault code 840, 841, 878 or 879 and:
     (a) The CLASS 3 FAULT data gives fault code 815, go to (Ref. TSM TASK 32-42-00-810-818).
     (b) The CLASS 3 FAULT data gives fault code 816, go to (Ref. TSM TASK 32-42-00-810-820).
     (c) The CLASS 3 FAULT data gives fault code 817, go to (Ref. TSM TASK 32-42-00-810-822).
     (d) The CLASS 3 FAULT data gives fault code 818, go to (Ref. TSM TASK 32-42-00-810-816).
   (4) If the fault continues, or if the fault code given in the TSD is not one of the codes given in this step, refer to Para B.
Subtask 32-42-00-810-201-D ** ON A/C NOT FOR ALL
A. If the BITE test or the GROUND SCANNING gives the maintenance message:
  • TACHOMETER2(21GG)/BSCU(10GG) with the fault code 840 or
  • TACHOMETER4(22GG)/BSCU(10GG) with the fault code 841 or
  • BSCU (10GG)with the fault code 180, 181, 815, 878 or 879:
   (1) Read the TROUBLE SHOOTING DATA and the CLASS 3 FAULTS of the BSCU (10GG) 32-42-00-03 TSM TASK 32-42-00-03.
   (2) If the trouble shooting data gives fault code 180, refer to Para C.
   (3) If the trouble shooting data gives fault code 181, refer to Para D.
   (4) If the trouble shooting data gives fault code 840, 841, 878 or 879 and:
     (a) The CLASS 3 FAULT data gives fault code 815, go to (Ref. TSM TASK 32-42-00-810-818).
     (b) The CLASS 3 FAULT data gives fault code 816, go to (Ref. TSM TASK 32-42-00-810-820).
     (c) The CLASS 3 FAULT data gives fault code 817, go to (Ref. TSM TASK 32-42-00-810-822).
     (d) The CLASS 3 FAULT data gives fault code 818, go to (Ref. TSM TASK 32-42-00-810-816).
   (5) If the fault continues, or if the fault code given in the TSD is not one of the codes given in this step, refer to Para B.
Subtask 32-42-00-810-207-D
B. Replace the BSCU [10GG] AMM 32-42-34-000-001 and AMM 32-42-34-400-001.
Subtask 32-42-00-810-202-C
C. If the trouble shooting data gives fault code 180:
   (1) If the fault continues:
   (2) If the fault continues:
  • Replace the AUTO BRK/MAX pushbutton switch (6GG) ESPM 2045110.
   (3) If the fault continues:
  • Do a check and repair the:
    . wiring from the BSCU (10GG) pin AB/1C to the ANN LT Test & INTFC board (1LP) pin A/34
    . wiring between the pin A/32 and the pin A/35 of the ANN LT Test & INTFC board (1LP)
    . wiring from the ANN LT Test & INTFC board (1LP) A/33 to the first terminal block
    . wiring from the ANN LT Test & INTFC board (1LP) A/18 to the AUTO BRK/MAX pushbutton switch (6GG) pin A/4
    . wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/A1 to the BSCU (10GG) pin AA/13E
    . wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/8 to the first terminal block
    . wiring between the pin A/9 and the pin A/5 of the AUTO BRK/MAX pushbutton switch (6GG)
    . wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/A3 to the ground terminal.
Subtask 32-42-00-810-203-C
D. If the trouble shooting data gives fault code 181:
   (1) If the fault continues:
   (2) If the fault continues:
  • Replace the AUTO BRK/MAX pushbutton switch (6GG) ESPM 2045110.
   (3) If the fault continues:
  • Do a check and repair the:
    . wiring from the BSCU (10GG) pin AB/1D to the ANN LT Test & INTFC board pin A/31
    . wiring from the ANN LT Test & INTFC board (1LP) A/33 to the first terminal block
    . wiring from the ANN LT Test & INTFC board (1LP) A/17 to the AUTO BRK/MAX pushbutton switch (6GG) pin A/7
    . wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/A1 to the BSCU (10GG) pin AA/13E
    . wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/8 to the first terminal block
    . wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/A3 to the ground terminal.
Subtask 32-42-00-810-258-B
E. If the trouble shooting data gives the fault code 185:
   (1) If the fault continues:
   (2) If the fault continues:
  • Replace the AUTO BRK/LO pushbutton switch (8GG) ESPM 2045110.
   (3) If the fault continues:
  • Do a check and repair the:
    . Wiring from the ANN LT Test & INTFC board (1LP) A/37 to the AUTO BRK/LO pushbutton switch (8GG) pin A/4
    . Wiring from the ANN LT Test & INTFC board (1LP) A/10 to the AUTO BRK/LO pushbutton switch (8GG) pin A/7
    . Wiring from the AUTO BRK/LO pushbutton switch (8GG) pin A/A1 to the BSCU (10GG) pin AA/15E
    . Wiring from the AUTO BRK/LO pushbutton switch (8GG) pin A/6 to the first terminal block
    . Wiring between pin A/9 and pin A/5 of the AUTO BRK/LO pushbutton switch (8GG)
    . Wiring from the AUTO BRK/LO pushbutton switch (8GG) pin A/A3 to the ground terminal.
    ASM 324203
Subtask 32-42-00-810-259-B
F. If the trouble shooting data gives fault code 186:
   (1) If the fault continues:
   (2) If the fault continues:
  • Replace the AUTO BRK/MED pushbutton switch (7GG) ESPM 2045110.
   (3) If the fault continues:
  • Do a check and repair the:
    . Wiring from the ANN LT Test & INTFC board (1LP) A/13 to the AUTO BRK/MED pushbutton switch (7GG) pin A/4
    . Wiring from the ANN LT Test & INTFC board (1LP) A/44 to the AUTO BRK/MED pushbutton switch (7GG) pin A/7
    . Wiring from the AUTO BRK/MED pushbutton switch (7GG) pin A/A1 to the BSCU (10GG) pin AA/14E
    . Wiring between pin A/8 of the AUTO BRK/MED pushbutton switch (7GG) and pin A/6 of the AUTO BRK/MAX pushbutton switch (6GG).
    . Wiring between pin A/6 of the AUTO BRK/MED pushbutton switch (7GG) and pin A/8 of the AUTO BRK/LO pushbutton switch (8GG).
    . Wiring between pin A/9 and pin A/5 of the AUTO BRK/MED pushbutton switch (7GG)
    . Wiring from the AUTO BRK/MED pushbutton switch (7GG) pin A/A3 to the ground terminal.
    ASM 324203
Subtask 32-42-00-810-260-B
G. If the trouble shooting data gives fault code 187:
   (1) If the fault continues:
   (2) If the fault continues:
  • Replace the AUTO BRK/MAX pushbutton switch (6GG) ESPM 2045110.
   (3) If the fault continues:
  • Do a check and repair the:
    . Wiring from the ANN LT Test & INTFC board (1LP) A/18 to the AUTO BRK/MAX pushbutton switch (6GG) pin A/4
    . Wiring from the ANN LT Test & INTFC board (1LP) A/17 to the AUTO BRK/MAX pushbutton switch (6GG) pin A/7
    . Wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/A1 to the BSCU (10GG) pin AA/13E
    . Wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/8 to the first terminal block
    . Wiring between pin A/9 and pin A/5 of the AUTO BRK/MAX pushbutton switch (6GG)
    . Wiring from the AUTO BRK/MAX pushbutton switch (6GG) pin A/A3 to the ground terminal.
    ASM 324203
Subtask 32-42-00-740-187-A
H. Do the test given in Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:31:38 UTC
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