S 843-038

 (4)  
Do the "Control Display Unit Installation" task
 (Ref 34-61-02/401).

 S 863-056
 S 163-037
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747-400 MAINTENANCE MANUAL
 TASK 34-61-02-103-039
 3.  CDU Display Screen Cleaning___________________________
 A. Standard Tools and Equipment
 (1)  Cloth - Clean, lint-free, cotton
 B. Consumable Materials
 (1)  B00032 Cleaner - Glass, glyst concentrated
 C. Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Procedure
 S 163-040
 (1)  Remove the surface grease and dirt from the CDU display screen with the glass cleaner and the cloth.
 TASK 34-61-02-003-007
 4.  CDU Annunciator Lamp Replacement (Fig. 301)___________________________________________
 A. General
 (1)  The CDU front panel contains four annunciators. Two of the annunciators, DSPY and FAIL, are on the left side of the CDU. Two of the annunciators, MSG and OFST, are on the right side of the CDU. Each annunciator is illuminated by two lamps that are installed on the circuit board assembly.
 B. Reference
 (1)  24-22-00/201, Manual Control
 C. Access
 (1)  Location Zones
 221 Control Cabin, LH
 221 Control Cabin, RH

 D. Procedure
 S 863-049
 (1) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel 1) 6L5 FLT DECK LIGHT CAPT IND DGTL DSPL
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747-400 MAINTENANCE MANUAL
 2) 6F27 FLT DK LIGHTS F/O IND & DGTL DSP
 (b)  P7 Overhead Circuit Breaker Panel
 1) 7C1 FMCS FMC L
 2) 7C2 FMCS CDU L
 3) 7C3 FMCS CDU C
 4) 7C23 FMCS FMC R
 5) 7C24 FMCS CDU R

 S 023-050
 (2)  Remove the annunciator lamp:
 (a)  
Loosen the two captive screws (4) that connect the left or right annunciator assembly (5).

 (b)  
Remove the annunciator assembly (5) to get to the two annunciator lamps (6).

 (c)  
Remove the defective lamp (6) from the terminals (7) on the circuit board (8).

 S 423-051
 (3)  Install the annunciator lamp:
 (a)  
Install the annunciator lamp (6) on the terminals (7) on the circuit board (8).

 (b)  
Install the annunciator assembly (5) on the keyboard assembly (9).

 (c)  
Tighten the two captive screws (4).

 E. CDU Annunciator Lamp Test
 S 843-052
 (1)  
Do the "Supply Electrical Power" task (Ref 24-22-00/201).

 S 863-053

 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Distribution Panel 1) 6L5 FLT DECK LIGHT CAPT IND DGTL DSPL 2) 6F27 FLT DK LIGHTS F/O IND & DGTL DSPL

 (b)  
P7 Overhead Circuit Breaker Panel
 1) 7C1 FMCS FMC L
 2) 7C2 FMCS CDU L

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747-400 MAINTENANCE MANUAL
 3) 7C3 FMCS CDU C
 4) 7C23 FMCS FMC R
 5) 7C24 FMCS CDU R

 S 713-054
 (3)  Do a test of the CDU annunciator lamps:
 (a)  
　
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