1. Possible Causes
_______________
 - WHC-1 (2DG1)

 - LGCIU-1 (5GA1)

 - LGCIU-2 (5GA2)

 - wiring

 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 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
 AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
 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. If the test gives the maintenance message CHECK LGCIU - WHC 1 INTERFACE:
 - do a check for ground at pin B/F and/or pin B/T of the WHC 1 (2DG1).
 (1) If there is ground:

 - replace the WHC-1 (2DG1), (Ref. AMM TASK 30-42-34-000-001) and (Ref. AMM TASK 30-42-34-400-001).

 (2) If there is no ground:

 - replace the LGCIU-1 (5GA1), (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
 (a) If the fault continues:
 - replace the LGCIU-2 (5GA2).
 「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 282
 Aug 01/05R CES

 (b) If the fault continues:

 1 Do a check and repair the wiring:
_
 - from the WHC 1 (2DG1) pin B/F to the LGCIU 1 (5GA1) pin AB/14A and/or

 - from the WHC 1 (2DG1) pin B/T to the LGCIU 2 (5GA2) pin

 AB/14A.
 (Ref. ASM 30-42/01)

 B. 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 283
 Aug 01/05R
 CES  Loss of the GND/FLT Information

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

 - LGCIU-1 (5GA1)

 - LGCIU-2 (5GA2)

 - wiring

 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 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
 AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
 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. If the test gives the maintenance message CHECK LGCIU - WHC 2 INTERFACE:
 - do a check for ground at pin B/F and/or pin B/T of the WHC 2 (2DG2).
 (1) If there is ground:

 - replace the WHC-2 (2DG2), (Ref. AMM TASK 30-42-34-000-001) and (Ref. AMM TASK 30-42-34-400-001).

 (2) If there is no ground:

 - replace the LGCIU-1 (5GA1), (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
 (a) If the fault continues:
 - replace the LGCIU-2 (5GA2).
 「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 284
 Aug 01/05R CES

 (b) If the fault continues:
 1 Do a check and repair the wiring:
_
 - from the WHC 2 (2DG2) pin B/F to the LGCIU 1 (5GA1) pin AB/14E and/or

 - from the WHC 2 (2DG2) pin B/T to the LGCIU 2 (5GA2) pin

 AB/14E.
 (Ref. ASM 30-42/02)

 B. Do the operational test given in Para. 3.
　
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