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 23-32-02
 ú ú 02 Page 403 ú May 20/98
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A

757 MAINTENANCE MANUAL
 S 714-010
 (3) Do an operational test of the video system (Ref 23-32-00/501).
 (a) Make sure the installed monitor operates.
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757 MAINTENANCE MANUAL
 SYSTEM CONTROL UNIT - REMOVAL/INSTALLATION
__________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the system control unit. The second task installs the unit and does a test of the installation.
 B.  The system control unit is in the video control center. It attaches to the support pallet in the control center by an adapter plate on the bottom of the unit.
 TASK 23-32-03-024-002
 2.  System Control Unit (SCU) Removal_________________________________(Fig. 401)
 NOTE: The System Control Unit is also referred to as the Control
____
 Distribution Unit (CDU), or the Control Unit.

 A.  References
 (1)  20-10-01/401, E/E Rack-Mounted Components
 B.  Access
 (1)  Location Zone
 252 Passenger Cabin - section 46 (Right)

 C.  Prepare for the Removal
 S 864-003
 (1)  Open this circuit breaker on the overhead circuit breaker panel, P11, and attach a DO-NOT-CLOSE tag:
 (a)  11H30, VIDEO SYS DC
 S 864-004
 (2)  Open these circuit breakers on the right miscellaneous electrical equipment panel, P37, and attach DO-NOT-CLOSE tags:
 (a)  
37A6, VIDEO SYSTEM (MAIN BUS) MONITOR FWD

 (b)  
37A7, VIDEO SYSTEM (MAIN BUS) MONITOR AFT

 (c)  
37A8, VIDEO SYSTEM (MAIN BUS) SYSTEM AC

 (d)  
37C6, VIDEO SYSTEM (UTIL BUS) MONITOR FWD

 (e)  
37C7, VIDEO SYSTEM (UTIL BUS) MONITOR AFT

 (f)  
37C8, VIDEO SYSTEM (UTIL BUS) SYSTEM AC

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757 MAINTENANCE MANUAL
 D. System Control Unit Removal
 S 024-095
 (1)  
GUN 102-199;
 Remove the system control unit (Ref 20-10-01/401).

 S 024-108

 (2)  
GUN 008-101; Do these steps at the video control center to remove the SCU.

 (a)  
Remove 2 screws along the front edge of the SCU adapter plate.

 (b)  
Lift the front of the SCU a little, and pull forward to release the tab from the slot near the rear of the unit.

 (c)  
Remove the electrical connectors from the rear of the SCU.

 (d)  
Remove the SCU from the video control center.

 (e)  
Remove the adapter plate from the bottom of the SCU (4 screws).

 (f)  
Keep the adapter plate, and hardware, to install the unit later.

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757 MAINTENANCE MANUAL
 TASK 23-32-03-424-093
 3. System Control Unit (SCU) Installation______________________________________(Fig. 401)
　
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