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747-400 MAINTENANCE MANUAL
 (c)  Lower the light assembly on its hinge to get access to the ballast.
 S 024-023
 (4)  Remove the ballast:
 (a)  
Disconnect the electrical cable from the ballast.

 (b)  
Remove the screws that attach the ballast to the base plate.

 (c)  
Remove the ballast from the base plate.

 TASK 33-28-04-404-034
 3.  Sidewall Light - Ballast Installation (Fig. 401)_____________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-21-02/401, Upper Deck Window Reveal and Shade

 (3)  
SSM 33-28-04

 B. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 C. Ballast Installation
 S 424-024
 (1)  Install the new ballast:
 (a)  
Set the ballast on the base plate.

 (b)  
Install the screws that attach the ballast to the base plate.

 (c)  
Connect the electrical cable to the ballast.

 S 424-032
 (2)  
BALLAST BEHIND A SIDEWALL; Install the window reveal (sidewall) panel (AMM 25-21-02/401).

 S 414-025

 (3)  
BALLAST ABOVE THE SIDEWALL LIGHT;
 Close the light assembly:

 (a)  
Lift the light assembly to its usual position.

 (b)  
Install the screw that attaches the base plate of the light assembly to the window reveal.

 (c)  
Carefully install the lamp.

 D. Ballast Test
 S 864-029
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-028

 (2)
Close this circuit breaker and remove the DO-NOT-CLOSE tag:

 (a)  P414 Power Distribution Center - Left 1) 414L17 UPR DK WNDW REVEAL LIGHT
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 (3)  S 714-031Do a test of the ballast: (a) At the attendant's panel, set the switch for the sidewall lights to the dim position. 1) Make sure the applicable lamp comes on dimly. (b) Set the switch to the bright position. 1) Make sure the lamp becomes bright. (c) Set the switch to the usual position.
 (4)  S 864-021Remove electrical power if it is not necessary (AMM 24-22-00/201).

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MAINTENANCE MANUAL

BALLAST ABOVE THE SIDEWALL LIGHT
(EXAMPLE)

Upper Deck Sidewall Lights - Ballast Installation
Figure 401

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 UPPER DECK DIRECT CEILING LIGHTS - MAINTENANCE PRACTICES
________________________________________________________
 1.  General (Fig. 201)_______
 A.  This procedure contains a task that replaces lamps in the direct ceiling lights.
 TASK 33-28-05-962-001
 2.  Direct Ceiling Lights Lamp Replacement______________________________________
 A.  References
 (1)  
23-30-01/501, ACESS

 (2)  
24-22-00/201, Manual Control

 (3)  
IPC 33-28-01

 (4)  
SSM 33-28-07
　
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