23-34-05
 ú ú 06 Page 403 ú Jun 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 SEAT ELECTRONICS BOX - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes a seat electronics box (SEB). The second task installs the SEB and does a test of the installation.
 B.  A seat electronics box (SEB) is on the seat frame of each seat group. The removal and installation procedures are the same for each SEB.
 TASK 23-34-06-004-028
 2.  Remove the Seat Electronics Box (SEB)_____________________________________
 A.  Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 B.  Procedure
 S 864-031
 (1)  
Turn the PES switch to OFF on the forward attendant's panel, P21, and attach a DO-NOT-OPERATE tag.

 S 014-052

 (2)  
Loosen SEB cover fasteners.

 S 014-053

 (3)  
Remove SEB covers.

 S 034-007

 (4)  
Disconnect the electrical connectors from the SEB.

 S 024-008

 (5)  
Pull the plastic fasteners (4 locations) to remove the SEB from the seat frame.

 TASK 23-34-06-404-032
 3.  Install the Seat Electronics Box (SEB)______________________________________
 A.  References
 (1)  AMM 24-22-00/201, Electrical Power - Control
 B.  Access
 (1)  Location Zones
 200 Upper Half of Fuselage

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH PASSENGER ENTERTAINMENT ú

 23-34-06
 ú ú 04 Page 401 ú Mar 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 C. Procedure
 S 424-010
 (1)  
To install the SEB on the seat frame, push the fasteners
 (4 locations) into the holes of the mounting bracket.

 S 414-054

 (2)  
Install SEB covers.

 S 414-055

 (3)  
Tighten SEB cover fasteners.

 S 434-011

 (4)  
Connect the electrical connectors to the SEB.

 NOTE: J1 and J2 connectors are interchangeable.
____
 D. Seat Electronics Box (SEB) Installation Test
 S 864-042
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-049

 (2)  
Remove the DO-NOT-OPERATE tag, and turn the PES switch to TEST, on the forward attendant panel, P21.

 S 714-036

 (3)  
At the seat group where the SEB was replaced:

 (a)  Make sure each passenger control unit (PCU) has the center horizontal piece of the right number on. 1) All other pieces of the display must be off.
 E. Put the Airplane Back to Its Usual Condition
 S 864-047
 (1)  
Turn the PES switch to OFF.

 (2)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-027
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH PASSENGER ENTERTAINMENT ú

 23-34-06
 ú ú 03 Page 402 ú Mar 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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1.

2.

3.

757 MAINTENANCE MANUAL
 SERVICE INTERPHONE SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________
General
_______
 A.  The service interphone system provides facilities for interphone communication between servicing stations during ground operations. In addition, communication is extended to the flight compartment and attendant stations.
 B.  The service interphone system includes phone jacks located at convenient service locations around the airplane. The system also includes amplifiers and mixing circuits that are housed inside the audio accessory unit. It is located on shelf E4 of the main equipment center. The SERV INTPH switch activates the system and is located on the right sidewall panel, P61.
　
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