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A 747-400 MAINTENANCE MANUAL
 (b) (c) (d)  Remove the lamp cover assembly from the P7 panel.Replace the lamp.Install the lamp cover assembly and tighten the screws.
 (2)  S 862-024Supply electrical power (Ref 24-22-00/201).
 (3)  S 862-025Make sure these circuit breakers are closed: (a) P6 Main Power Distribution Panel 1) 6L2 FLT DK LIGHT DOME 2) 6L3 FLT DK LIGHT STORM
 (4)  S 712-018Do a test of the replaced lamp: (a) Set the STORM light switch to ON. 1) The STORM switch is on module M7261 in the P5 panel. (b) Make sure that the replaced floodlight lamp comes on. (c) Set the STORM switch to OFF.
 (5)  S 862-029Remove the electrical power if it is not necessary (Ref 24-22-00/201).

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A
747-400 MAINTENANCE MANUAL
 LIGHTPLATES - MAINTENANCE PRACTICES
___________________________________
 1.  General_______
 A.  This procedure contains the tasks that remove and install the
 lightplates.

 B.  Lightplates are installed on circuit breakers and on instrument panel modules.
 (1)  
Each lightplate contains a data panel and a circuit board.

 (2)  
Two or more lamps supply light for each word on the data panel.

 (3)  
Many small lamps and one coaxial plug connector are installed on the circuit board.

 (4)  
Do not repair the lightplates in the airplane.

 TASK 33-11-12-002-002
 2.  Lightplate Removal (Fig.__________________201)
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC, 33-11-12

 B.  Access
 (1)  Location Zone
 200 Flight Deck, Pilots Instrument Panel

 C.  Removal Procedure
 S 862-007
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 212-014

 (2)  
Identify defective lamps in the lightplates:

 (a)  
Turn the lightplate control knob full clockwise.

 (b)  
See that the lightplates come on.

 (c)  
Examine the lightplates to identify the lightplate areas where data panel lights do not come on.

 S 022-015
 (3)  Remove the lightplate:
 (a) Turn the lightplate control full counterclockwise.
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747-400 MAINTENANCE MANUAL
 (b)  
Remove the control knobs from the lightplate.

 (c)  
Loosen screws that install the lightplate.

 (d)  
Twist and pull the lightplate to remove the lightplate connector from the module.

 TASK 33-11-12-402-011
 3.  Lightplate Installation (Fig. 201)_______________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 33-11-12

 B. Access
 (1)  Location Zone
 200 Flight Deck, Pilots Instrument Panel

 C. Installation Procedure
 S 422-016
 (1)  Install the lightplate:
 (a)  
Put the lightplate electrical connector on the module receptacle.

 (b)  
Push the lightplate connector into the module receptacle.

 (c)  
Tighten the screws that attach the lightplate to the module.
　
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