W DOC AIRBUS | TSM A320F

Loss of Phase B of the R Windshield and Right Side Windows Power Supply

TASK 30-42-00-810-808-A
Loss of Phase B of the R Windshield and Right Side Windows Power Supply

1. Possible Causes
  • wiring between the WHC 2 pin A/G and the ground terminal
  • wiring between the WHC 2 pin A/B and the circuit breaker (1DG2)
  • wiring between the WHC 2 pin B/G and the circuit breaker (4DG2)
  • WHC-2 [2DG2]
  • C/B-ANTI ICE/R/WHSLD [1DG2]
  • C/B-ANTI ICE/WINDOWS/R [4DG2]
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 304202
3. Fault Confirmation
Subtask 30-42-00-710-064-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 30-42-00-865-055-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
122VUANTI ICE/WINDOWS/R4DG2W14
123VUANTI ICE/R/WHSLD1DG2AF03
Subtask 30-42-00-810-057-A
B. If the test gives the maintenance message CHECK WINDSHIELD WHC2 SUPPLY:
  • do a check of the status of the circuit breakers (1DG2) and (4DG2).
   (1) If the circuit breaker (1DG2) and/or the circuit breaker (4DG2) are/is closed:
  • do a check for 115VAC at pin A/B and pin B/G of the WHC 2 (2DG2) ASM 304202.
     (a) If there is no 115VAC:
  • do a check for a ground signal at pin A/G of the WHC 2 (2DG2).
       1 If there is no ground signal:
  • repair the wiring between the WHC 2 pin A/G and the ground terminal.
       2 If there is ground signal:
  • do a check of the wiring between the WHC 2 pin A/B and the circuit breaker (1DG2) and/or do a check of the wiring between the WHC 2 pin B/G and the circuit breaker (4DG2).
         a If there is no continuity:
  • repair the above wiring.
         b If there is continuity:
  • replace the circuit breaker (1DG2) and the circuit breaker (4DG2).
   (2) If the circuit breakers are open:
  • close the circuit breakers.
     (a) If the circuit breakers trip again:
  • replace the WHC-2 [2DG2] .
       1 If the fault continues:
  • do a check for a short to ground at the wiring between the WHC 2 pin A/B and the circuit breaker (1DG2) and at the wiring between the WHC 2 pin B/G and the circuit breaker (4DG2).
         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/R/WHSLD [1DG2] and/or the C/B-ANTI ICE/WINDOWS/R [4DG2] .
     (b) If the circuit breakers stay closed and the fault continues:
  • replace the WHC-2 [2DG2] .
Subtask 30-42-00-710-065-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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