(e)  
Install the terminal cover and the fuse holder cap on the dimmer.

 (f)  
Close the secondary circuit breaker(s) on the dimmer.

 (g)  
Close the P7 panel.

 S 714-071
 (3)  Do a test of the dimmer:
 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Turn the dimmer control full clockwise.

 (c)  
Make sure the instrument lights come on and change from a dim intensity to a bright intensity.

 (d)  
Turn the dimmer control counterclockwise to the OFF position.

 (e)  
Make sure the instrument lights change to a dim intensity and then go off.

 S 864-022
 (4)  Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

 TASK 33-11-05-004-023
 4. Dimmer Removal from the P9 Aisle Control Stand
______________________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
34-61-02/401, Control Display Unit

 (3)  
IPC 33-11-04 Fig 1

 (4)  
SSM 33-11-01, 33-11-03, 33-11-04

 B. Access
 (1)  Location Zone 200 Pilots Instrument Panel, Flight Compartment
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 C.  Removal Procedure
 S 864-072
 (1)  Prepare for a dimmer removal from the control stand:
 (a) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 1)  P6 Main Power Distribution Panel a) 6L1 FLT DK LIGHT STBY INST b) 6E19 FLT DK LIGHTS PANEL CAPT c) 6E21 FLT DK LIGHTS PANEL GLARESHIELD d) 6E22 FLT DK LIGHTS PANEL CONT STAND e) 6E23 FLT DK LIGHTS PANEL F/O f) 6E26 FLT DK LIGHTS PILOTS MAIN g) 6E27 FLT DK LIGHTS FLOOD GLARESHIELD
 S 014-073
 (2)  Get access to the control stand dimmers:
 (a)  
Remove the Right Control Display Unit (RCDU) for access to dimmers T77, T102, T144, and T951 (Ref 34-61-02/401).

 (b)  
Remove the Left Control Display Unit (LCDU) for access to dimmers T137, T961, T1735, and T1736 (Ref 34-61-02/401).

 S 024-074
 (3)  Remove the dimmer:
 (a)  
Remove the terminal cover and the fuse holder cap from the dimmer. 1) Turn the fuse holder cap counterclockwise to release it

 from the dimmer.

 (b)  
Remove the nuts from the electrical terminals on the dimmer.

 (c)  
Disconnect the wires from the dimmer electrical terminals.

 (d)  
Remove the screws that attach the dimmer to the control stand.

 (e)  
Remove the dimmer from the control stand.

 S 034-075
 (4)  Remove the secondary circuit breakers from the dimmer:
 (a)
Remove the cover(s) from the dimmer circuit breaker(s).

 (b)
Disconnect the dimmer wires from the circuit breakers.

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747-400 MAINTENANCE MANUAL
 (c) Remove the secondary circuit breakers from the dimmer.
 1)  Keep the secondary circuit breakers for installation in the new dimmer.
 TASK 33-11-05-404-034
 5.  Dimmer Installation in the P9 Aisle Control Stand
__________________________________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
34-61-02/401, Control Display Unit

 (3)  
IPC 33-11-04 Fig 1

 (4)  
SSM 33-11-01, 33-11-03, 33-11-04

 B.  Access
 (1)  Location Zone 200 Pilots Instrument Panel, Flight Compartment
 C.  Installation Procedure
　
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