(a)  
Put a headset into a passenger control unit (PCU) jack.

 (b)  
Use the channel select switches to make sure the audio on channels 3 thru 12 is clear.

 (c)  
While you listen to one of the audio channels push and hold each volume control switch. 1) Make sure the audio level changes.

 S 705-025
 (3)
Use the captains' audio-selector panel to make a PA announcement.

 S 865-054

 (4)  
Make sure of the conditions that follow at a PCU:

 (a)  
PA audio is on channels 3 thru 12 while the announcement is made.

 (b)  
Entertainment audio is on when the announcement ends.

 (c)  
Do the above steps again with an attendant handset to do the PA announcement.

 H. Put the Airplane Back to Its Usual Condition
 S 865-042
 (1)  
Turn the PES switch to OFF.

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

 S 865-063
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH PASSENGER ENTERTAINMENT ú

 23-34-00
 ú ú 03A Page 502 ú Jun 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 MAIN MULTIPLEXER - REMOVAL/INSTALLATION
_______________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes the main multiplexer. The second task installs the multiplexer and does a test of the installation.
 B.  Main multiplexer M10733 is on shelf 4 of the main equipment center rack E4 (E4-4).
 TASK 23-34-01-004-002
 2.  Remove the Main Multiplexer (Fig. 401)___________________________
 A.  References
 (1)  
06-41-00/201, Fuselage (Major Zones 100 and 200) Access Doors and Panels

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

 (3)  
20-41-01/201, Electrostatic Discharge Sensitive Devices

 B.  Access
 (1)  
Location Zone
 119/120 Main Equipment Center

 (2)  
Access Panel
 119BL Main Equipment Center

 C.  Prepare for Removal
 S 014-018
 (1)  
Open the access door, 119BL, for the main multiplexer (Ref 06-41-00/201).

 S 864-003

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

 (a)  37B8, MULTIPLEXER
 D.  Procedure
 S 914-019
 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.
 (1)  
Do the procedure for devices that are sensitive to electrostatic discharge (Ref 20-41-01/201).

 (2)  
Remove the main multiplexer (Ref 20-10-01/401).

 S 024-027
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH PASSENGER ENTERTAINMENT ú

 23-34-01
 ú ú 03 Page 401 ú Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 TASK 23-34-01-404-006
 3.  Install the Main Multiplexer (Fig. 401)____________________________
 A. References
 (1)  
06-41-00/201, Fuselage (Major Zones 100 and 200) Access Doors and Panels

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

 (3)  
20-41-01/201, Electrostatic Discharge Sensitive Devices

 (4)  
24-22-00/201, Electrical Power - Control

 B. Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Flight Compartment
 221/222 Passenger Compartment

 (2)  
Access Panel
 119BL Main Equipment Center

 C. Procedure
 S 864-040
 (1)  Make sure this circuit breaker on the right miscellaneous electrical equipment panel, P37, is open and a DO-NOT-CLOSE tag is attached:
　
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