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757 MAINTENANCE MANUAL
 INTERPHONE SPEAKER - REMOVAL/INSTALLATION
_________________________________________General
_______
 A.  Two interphone speakers are installed in the flight compartment. The captain's speaker is installed on the captain's forward console. The first officer's speaker is installed on the first officer's forward console. The removal/installation procedure is the same for both speakers.
 B.  This procedure contains two tasks. The first task removes the interphone speakers from the captain's and the first officer's forward consoles. The second task installs the interphone speakers to the forward consoles.
 TASK 23-51-02-004-001
Remove Interphone Speaker (Fig. 401)

_________________________

 A.  General
 (1)  This task gives the instructions to remove the interphone speaker from the forward console.
 B.  Access
 (1)  Location Zones
 211/212 Flight Compartment

 C.  Procedure
 S 864-003
 (1)  Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:
 (a)  
11C25, INTERPHONE CAPT FLT AMPL

 (b)  
11C26, INTERPHONE F/O OBS

 (c)  
11G29, INTERPHONE CAPT FLT AMPL

 (d)  
11G30, INTERPHONE F/O OBS

 S 014-006
 (2)  
Remove the access panel.

 S 014-007

 (3)  
Remove the oxygen stowage box for more access.

 (4)  
Remove the connector from the rear of the speaker.

 S 024-009

 (5)  
Remove the speaker.

 S 034-008
 (a) Lift the interphone speaker through the access opening.
 TASK 23-51-02-404-011
Install Interphone Speaker (Fig. 401)

__________________________

 A.  General
 (1)  This task gives the instructions to install the interphone speaker in the forward console.
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A

757
MAINTENANCE MANUAL

Interphone Speaker Installation
Figure 401

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A

757
MAINTENANCE MANUAL

 B. References
 (1)  24-22-00/201, Electrical Power - Control
 C. Access
 (1)  Location Zones
 211/212 Flight Compartment

 D. Procedure
 S 424-012
 (1)  
Install the interphone speaker.

 S 434-013

 (2)  
Install the connector to the rear of the speaker.

 S 434-014

 (3)  
Install the oxygen stowage box.

 S 414-015

 (4)  
Install the access panel.

 S 864-017

 (5)  
Remove DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:

 (a)  
11C25, INTERPHONE CAPT FLT AMPL

 (b)  
11C26, INTERPHONE F/O OBS

 (c)  
11G29, INTERPHONE CAPT FLT AMPL

 (d)  
11G30, INTERPHONE F/O OBS

 S 714-020
 (6)  
Interphone Speaker Installation Test

 S 864-021

 (7)  
Supply electrical power (Ref 24-22-00).

 (a)  
Turn the volume knob on the applicable interphone speaker to the middle position.

 (b)  
Make a flight interphone voice communication from the first observer's station.
　
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