Loss of the Power Supply of the Side Windows

TASK 30-42-00-810-813-A
Loss of the Power Supply of the Side Windows

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-00-00-810-803-A	Circuit Breaker Tripped and/or C/B TRIPPED Warning
AMM 30-42-00-710-001	Operational Test of the Windshield Anti-Icing and Defogging
ASM 304201
AMM 30-42-34-000-001	Removal of the Window Heat Computer (WHC)
AMM 30-42-34-400-001	Installation of the Window Heat Computer (WHC)

3. Fault Confirmation
Subtask 30-42-00-710-074-A

A. Test
(1) Do the operational test of the windshield anti-icing and defogging AMM 30-42-00-710-001.

4. Fault Isolation
Subtask 30-42-00-865-058-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	ANTI ICE/WINDOWS/L	4DG1	X14

Subtask 30-42-00-810-062-A

B. If the test gives the maintenance message CHECK WINDOWS WHC 1 SUPPLY:

(1) If the circuit breaker is closed:

(a) If there is 115VAC:

(b) If there is no 115VAC:

1 If there is no ground signal:

2 If there is a ground signal:

do a check of the wiring between the WHC 1 pin B/G and the circuit breaker (4DG1).

a If there is no continuity:

b If there is continuity:

(2) If the circuit breaker is open:

(a) If the fault continues:

(b) If the fault continues:

Subtask 30-42-00-710-075-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:29:42 UTC