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 NOTE:____ A time delay relay installed in the module operates after 10 seconds. At that time, the relay connects the dimmer cards in series with the indicator lamps and the lamp power.
 (d)  After 10 seconds, make sure the indicator lights change from a bright intensity to a dim intensity.
 NOTE:____ Indicator lights with red lenses will not change to a dim intensity.
 (e) (f)  Put the IND LTS switch to the BRT position.Make sure the indicator lights go off.
 NOTE:____ It is possible some indicator lights will not go off. system defect or a system configuration can make its indicator light stay on. A
 (6)  S 862-048Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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747-400
MAINTENANCE MANUAL

ELECTRICAL 
CONNECTORS 
DIMMER CARD  (4 LOCATIONS) 
(EXAMPLE) 
TEST RELAYS 
(POSITIONS 
1,3,5 AND 7) 
DIMMER RELAYS 
(POSITIONS 2,4,6 AND 8) TIME DELAY RELAY 
(FRONT VIEW)

GREEN LIGHT EMITTING DIODE INDICATORS ON THE DIMMER CARDS
MODULE COVER
(RIGHT SIDE)

Master Dim and Test Component Replacement
Figure 201

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747-400 MAINTENANCE MANUAL
 INDICATOR LIGHT - MAINTENANCE PRACTICES
_______________________________________
 1.  General_______
 A. This procedure contains these tasks for an indicator light:
 (1)  
Replace the lamps.

 (2)  
Replace the diode/fuse card.

 (3)  
Remove the indicator light assembly.

 (4)  
Install the indicator light assembly.

 B. Two lamps are installed in each indicator light.
 (1)  
Do not operate the indicator light with only one lamp.

 (2)  
An internal short circuit can occur if you install the lens in the module with one lamp.

 TASK 33-12-02-962-001
 2.  Lamp Replacement (Indicator Light) (Fig. 201)__________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
SSM 33-12-01

 (3)  
IPC 33-12-02 Fig. 20

 B. Access
 (1)  Location Zone 200 Flight Compartment , Pilots' Instrument Panels
 C. Replacement Procedure
 S 862-059
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 712-060

 (2)  
Find the defective lamps:

 (a)  
Put the IND LTS switch on the P5 panel to the TEST position.

 (b)  
Identify the lamps that do not come on.

 (c)  
Put the IND LTS switch to the BRT position.

 

 S 862-061
 (3) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel 1) 6F19 FLT DK LIGHTS PILOTS MISC IND 1 2) 6F20 FLT DK LIGHTS PILOTS MISC IND 2 3) 6F26 FLT DK LIGHTS F/O IND 4) 6F27 FLT DK LIGHTS F/O IND & DIG DISP 5) 6L4 FLT DK LIGHT CAPT IND 6) 6L5 FLT DK LIGHT CAPT IND & DIG DISP
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

DIODE/FUSE CARD  PANEL
SEEA B
LAMP
(2 LOCATIONS)

2
DRAWER ASSEMBLY
LENS CAP ASSEMBLY
DIODE/FUSE CARD REMOVAL INDICATOR LIGHT (EXAMPLE)
(EXAMPLE) A
INDEX
DRAWER
ASSEMBLY
　
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