(a)  
Remove the two nuts and washers that attach the speaker.

 (b)  
Lift the speaker to remove it from the panel assembly.

 (c)  
Keep the nuts and gasket for the installation.

 TASK 23-31-02-404-009
 3.  PSU Speaker Installation________________________
 A. References
 (1)  AMM 24-22-00/201, Electrical Power - Control
 B. Access
 (1)  Location Zones
 200 Upper Half of Fuselage

 C. PSU Speaker Installation (Fig. 401)
 S 864-025
 (1)  Make sure this circuit breaker on the overhead circuit breaker panel, P11, is open and a DO-NOT-CLOSE tag is attached:
 (a)  11C22, PASS ADRS AMPL
 S 434-010
 (2)  
Install the speaker gasket onto the panel assembly.

 S 424-011

 (3)  
AIRPLANES WITH SPRING-MOUNTED SPEAKERS;
 Install the speaker into the panel assembly:

 (a)  
On the panel assembly, move the torsion springs to permit speaker installation.

 (b)  
Put the speaker onto the panel assembly with the gasket aligned.

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757 MAINTENANCE MANUAL
 (c)  Release the torsion springs with the speaker in the correct positon.
 S 424-012
 (4)  AIRPLANES WITH STUD-MOUNTED SPEAKERS;
 Install the speaker into the panel assembly.

 (a)  
Put the speaker onto the panel assembly with the gasket aligned.

 (b)  
Attach the speaker to the panel assembly with the two nuts and washers.

 S 434-013
 (5)  
Connect the electrical wires to the COM and 2K terminals of the speaker transformer.

 S 414-016

 (6)  
Close the PSU panel assembly:

 (a)  
Lift the PSU panel assembly and attach the lanyard hook to the loop.

 (b)  
Close the PSU panel fully.
 1) Make sure the two latches close.

 D. PSU Speaker Installation Test
 S 864-016
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-018

 (2)  
Remove the DO-NOT-CLOSE tag and close the P11 panel circuit-breaker as follows:

 (a)  11C22, PASS ADRS AMPL
 S 714-024
 (3)  
Use a handset to make a PA announcement.

 (a)  Make sure clear voice comes from the installed speaker.

 (4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-026
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757 MAINTENANCE MANUAL
 LAVATORY SPEAKER - REMOVAL/INSTALLATION
_______________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
Forward Lavatory-A Speaker Removal

 (2)  
Forward Lavatory-A Speaker Installation (with installation test)

 (3)  
Ceiling-Mounted Lavatory Speaker Removal

 (4)  
Ceiling-Mounted Lavatory Speaker Installation (with installation test)

 B.  The passenger address speaker for the forward lavatory A is installed on the inboard wall to the right of the mirror and above the fluorescent lamp. In all other lavatories, the passenger address speaker is installed in the lavatory ceiling.
 C.  To do this procedure the cabin interphone system must operate
 (AMM 23-42-00).

 TASK 23-31-05-004-001
 2.  Forward Lavatory-A Speaker Removal__________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 33-26-00/201, Lavatory Lights - Maintenance Practices
　
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