W DOC AIRBUS | TSM A320F

Loss of Phase B of the L Windshield and Left Side Windows Power Supply

TASK 30-42-00-810-807-A
Loss of Phase B of the L Windshield and Left Side Windows Power Supply

1. Possible Causes
  • wiring between the WHC 1 (2DG1) pin A/G and the ground terminal
  • wiring
  • WHC-1 [2DG1]
  • circuit breaker (1DG1) and/or between the WHC 1 pin A/G and the circuit breaker
  • C/B-ANTI ICE/L/WHSLD [1DG1]
  • C/B-ANTI ICE/WINDOWS/L [4DG1]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 30-42-00-710-001
Operational Test of the Windshield Anti-Icing and Defogging
ASM 304201
3. Fault Confirmation
Subtask 30-42-00-710-062-A
A. Test
   (1) Do the operational test of the windshield anti-icing and defogging AMM 30-42-00-710-001.
4. Fault Isolation
Subtask 30-42-00-865-054-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
122VUANTI ICE/WINDOWS/L4DG1X14
123VUANTI ICE/L/WHSLD1DG1AF10
Subtask 30-42-00-810-056-A
B. If the test gives the maintenance message CHECK WINDSHIELD WHC1 SUPPLY:
  • do a check of the status of the circuit breakers (1DG1) and (4DG1).
   (1) If the circuit breaker (1DG1) and/or the circuit breaker (4DG1) are/is closed:
  • do a check for 115VAC at pin A/B and pin B/G of the WHC 1 (2DG1) ASM 304201.
     (a) If there is no 115VAC:
  • do a check for a ground signal at pin A/G of the WHC 1 (2DG1).
       1 If there is no ground signal:
  • repair the wiring between the WHC 1 (2DG1) pin A/G and the ground terminal.
       2 If there is a ground signal:
  • do a check of the wiring between the WHC 1 (2DG1) pin A/B and the circuit breaker (1DG1) and/or between the WHC 1 (2DG1) pin B/G and the circuit breaker (4DG1).
         a If there is no continuity:
  • repair the above wiring.
         b If there is continuity:
  • replace the circuit breaker (1DG1) and/or the circuit breaker (4DG1).
   (2) If the circuit breakers are open:
  • close the circuit breakers.
     (a) If the circuit breakers trip again:
  • replace the WHC-1 [2DG1] circuit breaker (1DG1) and/or between the WHC 1 pin A/G and the circuit breaker.
       1 If the fault continues:
  • do a check for a short to ground at the wiring between the WHC 1 pin A/B and the circuit breaker (1DG1) and/or between the WHC 1 pin A/G and the circuit breaker (4DG1).
         a If there is a short to ground:
  • repair the related wiring.
         b If there is no short to ground:
  • replace the C/B-ANTI ICE/L/WHSLD [1DG1] and/or the C/B-ANTI ICE/WINDOWS/L [4DG1] .
     (b) If the circuit breakers stay closed and the fault continues:
  • replace the WHC-1 [2DG1] .
Subtask 30-42-00-710-063-A
C. Do the operational test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:29:41 UTC
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