(4)
Deflect torsion springs at speaker (2 places) so that speaker can be removed from the PSU assembly.
(5)
Lift/remove speaker from PSU. Be careful not to damage the speaker gasket.
(6)
Release torsion springs.
B. Install Loudspeaker
(1)
Locate speaker gasket for proper mating with speaker and PSU.
(2)
Deflect torsion springs on PSU assembly to allow insertion of speaker.
(3)
Insert speaker onto PSU assembly so that gasket is installed properly.
(4)
Release torsion springs so that speaker is firmly in place.
(5)
Connect electrical wires to speaker transformer terminals as noted in the removal procedure.
(a)
Red to 2K.
(b)
Blue to COM.
(6)
Reconnect PSU electrical connector.
(7)
Lift PSU panel assembly until it latches into its normally installed position.
6. Removal/Installation of Attendant's Loudspeaker (Fig. 404)
A. Remove Loudspeaker
(1)
Release two catches and lower ceiling panel.
(2)
Identify and detach two leads from speaker.
(3)
Remove four screws, speaker cover, and speaker.
B. Install Loudspeaker
(1)
Hold speaker and cover in place and secure with four screws.
(2)
Attach leads to speaker.
(3)
Raise ceiling panel and check that catches are fully engaged.
7. Removal/Installation of Lavatory Loudspeaker (Fig. 405)
A. Remove Loudspeaker
(1)
Release two quick-release fasteners near each inboard corner of ceiling PSU in lavatory or insert small rod through hole in each inboard corner and push to release latches as applicable and lower PSU.
(2)
Identify and detach two leads from speaker.
(3)
Remove four screws, speaker cover, and speaker.
B. Install Loudspeaker
(1)
Hold speaker and cover in place and secure with four screws.
(2)
Attach leads to speaker.
(3)
Raise PSU and check that latches are fully engaged.
8. Test Loudspeaker Installation
A. Close PA AMPLIFIER circuit breaker on P6.
B. Provide electrical power and energize buses on P6.
C. Press the call button at a PSU and check that a single high tone is heard from the speaker.
D. If a more definitive test of speaker output is desired, perform Passenger Address System -Maintenance Practices (Ref 23-31-0).
E. Remove electrical power if no longer required.
5C8
23-31-11 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/85
532 PSU Loudspeaker Installation (ATI Interior)
Feb 20/85 Figure 403 23-31-11
Page 405
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
H59590
Typical Lavatory Loudspeaker Installation 518
23-31-11 Figure 405 Feb 15/79
Page 406
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SERVICE INTERPHONE SYSTEM - DESCRIPTION AND OPERATION
1. General
A. The service interphone system provides ground crew personnel and all airplane crewmembers with facilities that enable two-way voice communications during airplane servicing or during normal flight operations. The location of components is shown on Fig. 1 and 2.
B. Handset jacks are located throughout the airplane, internally and externally, for use by ground crew personnel to facilitate airplane servicing and maintenance. The service interphone switch on pilots' overhead panel P5 is used to disconnect these jacks from the system when they are not in use.
C. Handsets are installed on the forward and aft attendants' panel to provide facilities for communication between attendants. Control cabin crewmembers gain access to the system by selecting service interphone on their audio selector panels (Ref 23-53-0). This enables two-way voice communications between all crewmembers.
D. The service interphone system has no on/off switch. The system is energized whenever 28-volt dc power is applied through circuit breaker SERV/ATT INPH AMPL on panel P6-2. A dual power source is provided from the battery bus and unswitched electronics bus-2.
2. Amplifier
A. A transistorized amplifier module is installed in the audio accessory unit located on shelf 1 of electronic rack E2. It amplifies input audio sufficiently to provide communication to all service interphone stations.
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