EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-27-07
 ALL  ú ú 03 Page 201 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (c)  
One lampholder in each fluorescent light assembly has a telescopic end.

 (d)  
Remove the lamp as follows: 1) Push the lamp longitudinally to the lampholder with the telescopic end.

 2)  When the opposite end of the lamp is clear of its lampholder, remove the lamp.

 (e)  
Install a new lamp: 1) Put one end of the lamp into the lampholder with a

 telescopic end. 2) Push longitudinally on the lamp to the telescopic end. 3) Put the opposite end of the lamp in its lampholder.

 (f)  
If the replaced lamp was in the galley (work) light, install the lens.

 (g)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 1)  P414 Power Distribution Center - Left a) 414H22 CEILING LIGHT - UPPER DECK
 S 712-029
 (4)  Do a test of the light:
 (a)  
Remove each DO-NOT-OPERATE or DO-NOT-CLOSE tag. 1) Close each circuit breaker that was opened.

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

 (c)  
Set the switch to the usual position.

 S 862-047
 (5)  Remove the electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 33-27-07-962-016
 3.  Ballast Removal_______________
 A.  References
 (1)  
25-22-03/401, Upper Deck Ceiling Panels

 (2)  
SSM 33-27-01

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

 C.  Removal Procedure
 S 862-032
 (1)  Remove electrical power from the galley light ballast:
 (a)  Open each applicable circuit breaker and attach the DO-NOT-CLOSE tag: 1) On the Power Distribution Center Panel, P414.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-27-07
 ALL  ú ú 03 Page 202 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 022-048
 (2)  Do these ballast removal steps:
 (a)  
Remove the ceiling panel (Ref 25-22-03/401).

 (b)  
Remove the screws that attach the ballast to the panel.

 (c)  
Disconnect the electrical cable from the ballast.

 S 022-037
 (3)  To remove the ballast in the galley (work) lights, do these steps:
 (a)  
Remove the lens from the ceiling panel.

 (b)  
Remove the screws that attach the ballast to the light assembly.

 (c)  
Disconnect the electrical connector from the ballast.

 (d)  
Remove the ballast.

 TASK 33-27-07-422-031
 4.  Ballast Installation____________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
25-22-03/401, Upper Deck Ceiling Panels

 (3)  
SSM 33-27-01

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

 C. Installation Procedure
 S 422-049
 (1)  Do these ballast installation steps:
 (a)  
Put the ballast on the ceiling panel.

 (b)  
Connect the electrical connector to the ballast.

 (c)  
Install the screws that attach the ballast to the panel.

 (d)  
Install the ceiling panel (Ref 25-22-03/401).

 S 422-042
 (2)  To install the ballast in the galley (work) lights, do these steps:
 (a)  Put the ballast in the light assembly.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú