- connect pins B/A and B/B of the WHC1 (2DG1) to pins A/E and
R A/F of the sensor 2 (Ref. ESPM 20-44-11) and (Ref. ASM 30-42/01)
2 If the sensor 2 resistance is more than 715 ohms or less than
_
370 ohms:
- replace the WINDSHIELD-L (3DG1), (Ref. AMM TASK 56-11-11-000-001) and (Ref. AMM TASK 56-11-11-400-001).
(c) If the fault continues:
- replace the WHC-1 (2DG1), (Ref. AMM TASK 30-42-34-000-001) and (Ref. AMM TASK 30-42-34-400-001).
(d) If the fault continues:
- do a check and repair the wiring from the WHC 1 (2DG1) to the L windshield (3DG1) pin B/A and pin B/B to pins A/C and A/D and pins B/A and B/B to pins A/E and A/F.
(2) If the resistance is between 370 ohms and 715 ohms:
(a) Replace the WHC-1 (2DG1), (Ref. AMM TASK 30-42-34-000-001) and (Ref. AMM TASK 30-42-34-400-001).
(b) If the fault continues:
- do a check and repair the wiring from the WHC 1 (2DG1) to the L windshield (3DG1) pin B/A and pin B/B to pins A/C and A/D and pin B/A and pin B/B to pins A/E and A/F.
**ON A/C ALL
C. Do the operational test given in Para. 3.
Loss of Phase A of the Windshield Power Supply
1. Possible Causes
_______________
- WHC-1 (2DG1)
- wiring between pin A/G of the WHC 1 (2DG1) and ground terminal
- wiring between pin A/A of the WHC 1 (2DG1) and the circuit breaker (1DG1)
- C/B-ANTI ICE/L/WSHLD (1DG1)
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 AMM 30-42-34-000-001 Removal of the Window Heat Computer (WHC) (2DG1,2DG2). AMM 30-42-34-400-001 Installation of the Window Heat Computer (WHC) (2DG1,2DG2). ASM 30-42/01
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the windshield anti-icing and defogging (Ref. AMM TASK 30-42-00-710-001).
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
-------------------------------------------------------------------------------
R 123VU ANTI ICE/L/WHSLD 1DG1 AF10
B. If the test gives the maintenance message CHECK WINDSHIELD WHC1 SUPPLY:
- do a check of the status of the circuit breaker (1DG1).
(1) If the circuit breaker is closed:
- do a check for 115VAC at pin A/A of the WHC 1 (2DG1) (Ref. ASM 30-42/01).
(a) If there is 115VAC:
- replace the WHC-1 (2DG1), (Ref. AMM TASK 30-42-34-000-001) and (Ref. AMM TASK 30-42-34-400-001).
(b) 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 pin A/G of the WHC 1 (2DG1) and ground terminal.
2 If there is a ground signal:
_
- do a check of the wiring between pin A/A of the WHC 1 (2DG1) and the circuit breaker (1DG1).
a If there is no continuity:
_
- repair the above wiring. b If there is continuity:
_ - replace the C/B-ANTI ICE/L/WSHLD (1DG1).
(2) If the circuit breaker is open:
- close the circuit breaker.
(a) If the circuit breaker trips again:
- replace the WHC-1 (2DG1).
1 If the fault continues:
_
- do a check for a short to ground at the wiring between pin A/A of the WHC 1 (2DG1) and the circuit breaker (1DG1).
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/WSHLD (1DG1).
(b) If the circuit breaker stays closed and the fault continues:
- replace the WHC-1 (2DG1).
C. Do the operational test given in Para. 3.
「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 ∞∞30-42-00∞∞∞∞∞∞∞∞∞∞Page 208
Feb 01/03R CES
Loss of the Windshield Heating System
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本文链接地址：A320 Trouble Shooting Manual 排故手册 除冰和排雨(59)
