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A
737-300/400/500MAINTENANCE MANUAL
 S 712-027
 (2)  Do a test of the new ballast.
 (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 window reveal light comes on correctly.

 (d)  
Set the switch to the usual 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 lens into the light with the inboard edge pointed up. 2) Turn the lens until the clips on the inboard edge of the

 lens are on the inboard side of the sidewall panel. 3) Install the retaining screws.
 TASK 33-21-32-962-028
 5.  Window Reveal Light (Above the Sidewall) - Ballast Replacement (Fig. 201)______________________________________________________________
 A. General
 (1)  
Frequently a ballast can be used again after it goes to the shop for the replacement of a fuse it contains.

 (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

 (4)  
Access

 (a)  Location Zone
 100 Upper Half of Fuselage

 C. Procedure
 S 962-037
 (1)  Replace the window reveal light.
 NOTE:____The ballast is part of the light assembly. To replace the ballast, you must replace the light.
 (a)  Do one of these steps to remove electrical power from the window reveal light: 1) At the attendant's panel, set the switch to the off
 position and attach the DO-NOT-OPERATE tag.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-21-32
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A
737-300/400/500MAINTENANCE MANUAL
 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) Loosen each fastener that holds the lens. 2) Pull the front edge of the lens a small distance down and

 pull the lens inboard.

 (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.
 S 962-031
 (2)  Replace the window reveal light.
 (a)  
Carefully remove the lamp.

 (b)  
Remove the light. 1) Disconnect each electrical connector from the light.

 NOTE: A light with a ballast for only that one light has a
____ connector on one end. A light with a ballast for a pair of lights has a connector on each end.
 2)  Remove each bolt that holds the light.
 NOTE: Remove the bolt from each end of the light before
____ you remove each bolt in the center of the light.
 3)  Pull the light from the extrusions.
 (c)  Install the new window reveal light.
 1) Install each bolt that holds the light.

 NOTE: Install each bolt in the center of the light before
____ you install the bolt at each end of the light.
 2) Connect each electrical connector to the light.
 (d)  Carefully install the lamp.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-21-32
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