MAIN EQUIPMENT CENTER
Main Multiplexer - InstallationFigure 401
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757 MAINTENANCE MANUAL
 S 914-020
 CAUTION: DO NOT TOUCH THE MAIN MULTIPLEXER BEFORE YOU DO THE
_______ PROCEDURE FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE MAIN MULTIPLEXER.
 (2)  
Do the procedure for devices that are sensitive to electrostatic discharge (Ref 20-41-01/201).

 S 014-036

 (3)  
Remove the cover from the multiplexer.

 S 864-059

 (4)  
Set the switches on the main circuit card as follows:
 (GUN 008-050,
 GUN 052-999) (GUN 051)

 SWITCH NUMBER_____________ POSITION________ POSITION S1 OFF ON S2 OFF ON S3 OFF ON S4 OFF ON S5 OFF OFF S6 OFF OFF S7 OFF OFF
 S 414-042
 (5)  
Install the cover onto the main multiplexer.

 S 424-016

 (6)  
Install the main multiplexer (Ref 20-10-01/401).

 D. Main Multiplexer Installation Test
 S 864-044
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-052

 (2)  
Remove the DO-NOT-CLOSE tag, and close this circuit breaker on the right miscellaneous electrical equipment panel, P37:

 (a)  37B8, MULTIPLEXER
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 S 864-018
 (3)
Turn the PES switch to ON, at the forward attendant panel P21.

 S 714-032

 (4)  
Make sure you hear clear entertainment sound at a passenger control unit (PCU).

 E. Put the Airplane Back to Its Usual Condition
 S 864-048
 (1)  
Turn the PES switch to OFF.

 S 414-027

 (2)  
Close the access door, 119BL (Ref 06-41-00/201).

 S 864-063

 (3)
Remove electrical power if it is not necessary (Ref 24-22-00/201).

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757 MAINTENANCE MANUAL
 ENTERTAINMENT TAPE REPRODUCER - MAINTENANCE PRACTICES
_____________________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
Entertainment Tape Reproducer Removal

 (2)  
Entertainment Tape Reproducer Installation

 (3)  
Cassette Tape Removal

 (4)  
Cassette Tape Installation

 B.  The entertainment tape reproducer is on shelf 4 of the main equipment center rack E4 (E4-4).
 TASK 23-34-03-002-071
 2.  Entertainment Tape Reproducer Removal_____________________________________
 A.  References
 (1)  
AMM 06-41-00/201, Fuselage (Major Zones 100 and 200) Access Doors and Panels

 (2)  
AMM 20-10-01/401, E/E Rack-Mounted Components

 B.  Access
 (1)  
Location Zone
 120 Main Equipment Center (RH side)

 (2)  
Access Panel
 119BL Main Equipment Center

 C.  Procedure
 S 012-072
 (1)  
Open the access door, 119BL, for the entertainment tape reproducer (AMM 06-41-00/201).

 S 862-073