(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/WSHLD (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).
 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 223
 Feb 01/03R
 CES  Loss of Phase B of the R Windshield and R Side Windows Power Supply

 1. Possible Causes
_______________
 - WHC-2 (2DG2)

 - 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)

 - C/B-ANTI ICE/R/WSHLD (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 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
 -------------------------------------------------------------------------------122VU ANTI ICE/WINDOWS/R 4DG2 W14
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 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) (Ref. ASM 30-42/01).
 「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 224
 May 01/03 CES

 (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.
　
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