Loss of the Windshield Heating System
1. Possible Causes
_______________
- WINDSHIELD-R (3DG2)
- WHC-2 (2DG2)
- wiring from the WHC 2 (2DG2) to the R windshield (3DG2)
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).
AMM 56-11-11-000-001 Removal of the Windshield
AMM 56-11-11-400-001 Installation of the Windshield
ASM 30-42/02
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-212,
30-42-00-991-008 Fig. 203
R **ON A/C 106-149, 213-299, 301-399, 401-499,
30-42-00-991-008-A Fig. 203A
**ON A/C ALL
30-42-00-991-002 Fig. 204
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).
「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 220
Aug 01/05 CES
4. Fault Isolation
_______________
A. If the test gives the maintenance message R WINDSHIELD:
- disconnect the connector from the R windshield (3DG2) and do a check of the resistance between pin A and pin B.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-212,
(Ref. Fig. 203/TASK 30-42-00-991-008) R **ON A/C 106-149, 213-299, 301-399, 401-499,
(Ref. Fig. 203A/TASK 30-42-00-991-008-A)
**ON A/C ALL
(Ref. Fig. 204/TASK 30-42-00-991-002)
(1) If the resistance is more than 14 ohms or less than 10 ohms:
- replace the WINDSHIELD-R (3DG2), (Ref. AMM TASK 56-11-11-000-001) and (Ref. AMM TASK 56-11-11-400-001).
(2) If the resistance is between 10 ohms and 14 ohms:
(a) Replace the WHC-2 (2DG2), (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 2 (2DG2) to the R windshield (3DG2) pin A/C and pin A/D to pin A/A and pin A/B (Ref. ASM 30-42/02).
B. Do the operational test given in Para. 3.
Loss of Phase B of the L Windshield and L Side Windows Power Supply
1. Possible Causes
_______________
- WHC-1 (2DG1)
- wiring between the WHC 1 (2DG1) pin A/G and the ground terminal
- wiring
- circuit breaker (1DG1) and/or between the WHC 1 pin A/G and the circuit breaker
- C/B-ANTI ICE/L/WSHLD (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 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:
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PANEL DESIGNATION IDENT. LOCATION
-------------------------------------------------------------------------------122VU ANTI ICE/WINDOWS/L 4DG1 X14
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 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) (Ref. ASM 30-42/01).
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