33-21-32
 (SIDEWALL) LIGHTS ABOVE THE SIDEWALL  ú ú 01 Page 204 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2)  Open each circuit breaker for the window reveal light and attach the DO-NOT-CLOSE tag: a) On the load control center panel, P18.
 (b)  
Remove the lens from the window reveal light. 1) Release the retaining fastener on each end of the lens. 2) Pull the front edge of the lens a small distance down and

 then pull the lens inboard.

 (c)  
Carefully replace the lamp.

 NOTE: If the lamp has a cover or end caps, remove these parts
____ and install them on the new lamp.
 S 712-018
 (2)  Do a test of the new lamp.
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Remove each DO-NOT-OPERATE or DO-NOT-CLOSE tag. 1) Close each circuit breaker that was opened.

 (c)  
Set the switch to the on position. 1) Make sure the new lamp comes on correctly.

 (d)  
Set the switch to the off position.

 (e)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 (f)  
Install the lens of the window reveal light. 1) Put the outboard edge of the lens against the outboard edge of the extrusion. 2) Push the inboard edge of the lens against the inboard edge of the extrusion.

 3)  Hold the lens in its position and lock the retaining fasteners.
 TASK 33-21-32-962-023
 4.  Window Reveal Light (In the Sidewall) - Ballast Replacement (Fig. 201)
___________________________________________________________
 A.  General
 (1)  
Frequently a ballast can be repaired in the shop with the replacement of a fuse that is in the ballast.

 (2)  
Some ballasts supply electrical power to a pair of lights. When this type of ballast is defective, two adjacent lights will not come on correctly.

 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
SSM 33-21-00

 (3)  
WDM 33-21-11 thru 33-21-99

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 33-21-32
 ALL  ú ú 01 Page 205 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C.  Access
 (1)  Location Zone
 100 Upper Half of Fuselage

 D.  Procedure
 S 962-026
 (1)  Replace the ballast.
 (a)  Do one of these steps to remove electrical power from the ballast: 1) At the attendant's panel, set the switch for the window
 reveal light to the off position and attach the
 DO-NOT-OPERATE tag.
 2)  Open each applicable circuit breaker for the window reveal light and attach the DO-NOT-CLOSE tag. a) On the load control center panel, P18.
 (b)  
Remove the lens from the window reveal light. 1) Remove the retaining screws from the lens. 2) Lower the lens and turn it vertically. 3) Pull the lens away from the light.

 (c)  
Find the ballast at the end of the light.

 NOTE: For a pair of lights that did not come on correctly,
____ first look for the ballast this light. If you do not find it, then look for the ballast in the other light. Remove the lens to look in the other light.
 (d)  
Carefully remove the lamp.

 (e)  
Remove the ballast. 1) Hold the ballast and remove the retaining screws. 2) Disconnect the electrical connector and remove the ballast

 from the light.

 (f)  
Install the new ballast. 1) Attach the electrical connector to the ballast. 2) Install the ballast in the light with the retaining screws.

 (g)  
Carefully install the lamp.

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