1 If the resistance of the sensor 2 is between 370 ohms and 715
_
ohms:
- connect pins B/A and B/B of the WHC2 (2DG2) to pins A/E and
R A/F of the sensor 2 (Ref. ESPM 20-44-11) and (Ref. ASM 30-42/02).
2 If the sensor 2 resistance is more than 715 ohms or less than
_
370 ohms:
- replace the WINDSHIELD-R (3DG2), (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-2 (2DG2), (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 2 (2DG2) to the R windshield (3DG2) pins B/A and 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-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) pins B/A and B/B to pins A/C and A/D and pins B/A and 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-2 (2DG2)
- wiring between pin A/G of the WHC 2 and the ground terminal
- wiring between pin A/A of the WHC 2 and the circuit breaker (1DG2)
- C/B-ANTI ICE/R/WSHLD (1DG2)
- wiring between pin A/A of the WHC 1 (2DG1) and the circuit breaker (1DG2)
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 30-42/02
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/R/WHSLD 1DG2 AF03
B. If the test gives the maintenance message CHECK WINDSHIELD WHC2 SUPPLY:
- do a check of the status of the circuit breaker (1DG2).
(1) If the circuit breaker is closed:
- do a check for 115VAC at pin A/A of the WHC 2 (2DG2) (Ref. ASM 30-42/02).
(a) If there is 115VAC:
- replace the WHC-2 (2DG2), (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 2 (2DG2). 1 If there is no ground signal:
_
- repair the wiring between pin A/G of the WHC 2 and the ground terminal.
2 If there is a ground signal:
_
- do a check of the wiring between pin A/A of the WHC 2 and the circuit breaker (1DG2).
a If there is no continuity:
_
- repair the above wiring. b If there is continuity:
_ - replace the C/B-ANTI ICE/R/WSHLD (1DG2).
(2) If the circuit breaker is open:
- close the circuit breaker.
(a) If the circuit breaker trips again:
- replace the WHC-2 (2DG2).
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 (1DG2).
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/WSHLD (1DG2).
(b) If the circuit breaker stays closed and the fault continues:
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