(b)  
Attach the secondary circuit breaker(s) to the dimmer.

 (c)  
Install the cover(s) on the dimmer circuit breaker(s).

 S 424-077
 (2)  Install the dimmer in the control stand:
 (a)  
Put the dimmer in its position in the control stand.

 (b)  
Install the screws that attach the dimmer to the control stand.

 (c)  
Connect the electrical wires to the dimmer electrical terminals.

 CAUTION: TIGHTEN THE NUTS ON THE DIMMER ELECTRICAL TERMINALS TO 12
_______ TO 15 LB-IN (1.4 TO 1.7 KM). OVERTIGHTENING MAY RESULT IN STUD BREAKAGE.
 (d)  
Install the nuts on the dimmer electrical terminals.

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

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

 S 414-078
 (3)  Close the control stand:
 (a)  Install the RCDU or LCDU removed for dimmer access (Ref 34-61-02/401).
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747-400 MAINTENANCE MANUAL
 S 864-060
 (4)  Close these circuit breakers and remove the DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) 6L1 FLT DK LIGHT STBY INST
 2) 6E19 FLT DK LIGHTS PANEL CAPT
 3) 6E21 FLT DK LIGHTS PANEL GLARESHIELD
 4) 6E22 FLT DK LIGHTS PANEL CONT STAND
 5) 6E23 FLT DK LIGHTS PANEL F/O
 6) 6E26 FLT DK LIGHTS PILOTS MAIN
 7) 6E27 FLT DK LIGHTS FLOOD GLARESHIELD

 S 714-079
 (5)  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 come on brightly, change to a dim intensity, and go off.

 S 864-045
 (6)  Remove the electrical power if it is not necessary (Ref 24-22-00/201).
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747-400
MAINTENANCE MANUAL

DIMMER INSTALLATION SCREWS
CIRCUIT BREAKER PROTECTIVE COVERS
COVER
SCREWS

TERMINAL
PROTECTION
COVER
CIRCUIT BREAKER(S)
DIMMER UNIT (EXAMPLE)

Panel Light Dimmer Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 PILOTS' PANEL FLOODLIGHTS - MAINTENANCE PRACTICES
_________________________________________________
 1.  General_______
 A.  This procedure has three tasks:
 (1)  
Remove the pilots' instrument panel floodlights.

 (2)  
Install the pilots' instrument panel floodlights.

 (3)  
Replace the lamp of the control stand floodlight in the P7 panel.

 B.  The floodlight group contains five light assemblies. These assemblies are installed below the pilots' glare shield and lightshield.
 C.  Each floodlight assembly contains a housing, a circuit board with ten or fourteen lamps, and a lens.
 D.  The control stand floodlight is installed in the lower center of the P7 panel.
　
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