(c)
Remove the PA speaker and keep the hardware for the installation.
TASK 23-31-08-404-009
3. PA Speaker Installation
_______________________
A. References
(1)
AMM 24-22-00/201, Electrical Power - Control
(2)
AMM 25-22-02/401, Lowered Ceiling Panels - Removal/Installation
B. Access
(1)
Location Zones
120 Main Equipment Center (RH side)
200 Upper Half of Fuselage
(2)
Access Panel
119BL Main Equipment Center
C. PA Speaker Installation (Fig. 401)
S 864-019
(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 424-007
(2) Install the PA speaker onto the ceiling panel:
(a) Attach the PA speaker to the ceiling panel with the four nuts and washers kept from the removal.
NOTE: Make sure you put the connection terminals in the
____
correct position.
(b) With the polarity correct, connect the two wires to the speakers.
S 414-009
(3)
Attach the speaker cover over the speaker with the 4 screws kept from the removal.
(4)
Lift and fasten the ceiling panel (AMM 25-22-02/401).
S 414-008
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757 MAINTENANCE MANUAL
S 864-014
(5) Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P11 panel:
(a) 11C22, PASS ADRS AMPL
D. PA Speaker Installation Test
S 864-017
(1)
Supply electrical power (AMM 24-22-00/201).
S 714-020
(2)
Use a handset to make a PA announcement.
(a) Make sure clear voice comes from the installed speaker.
S 864-018
(3) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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757 MAINTENANCE MANUAL
PASSENGER ENTERTAINMENT (VIDEO) SYSTEM - DESCRIPTION AND OPERATION
__________________________________________________________________
1. General_______
A. The video system provides prerecorded video programs for passenger viewing. The video programs are displayed on monitors mounted in the passenger cabin ceiling above the main aisle. Video program audio is provided to the main multiplexer (AMM 23-34-00) for distribution to individual passenger seats and to the PA amplifier (AMM 23-31-00) for broadcast over the passenger cabin speakers.
B. The video control center is located in an aft right overhead stowage bin in the passenger cabin. The video tape reproducer (VTR) and control distribution unit (CDU) are located in the control center.
C. The video system receives 115v ac power from one of two sources. When the airplane is in the air, the video system receives 115v ac power from the right utility bus. If either engine is being started, when the airplane is on the ground, the video system receives 115v ac power from the right main ac bus. The video system receives 115v ac power through six circuit breakers on right misc electrical equipment panel P37 (three circuit breakers for each bus). The system also receives 28v dc power from the right dc bus through a circuit breaker on overhead panel P11. The source of 28v dc power does not change.
2. Component Details (Fig. 1)_________________
A. Video Tape Reproducer (VTR)
(1)
The video tape reproducer (VTR) is located in the video control center. The VTR provides prerecorded video and audio to the system.
(2)
The VTR has the following displays and controls:
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