(11)
The SEB receives the data stream from the main multiplexer and converts it into analog audio signals for the PCUs.
(12)
The SEB extracts the system command bits from the data stream and uses the information to pair stereo channels selected by the stereo/mono switches in the main multiplexer. The command bits are also used to initiate a self-test when the PES switch is in the TEST position.
(13)
A serial data line provides PCU volume and channel select information to the SEB. Activating a PCU channel select switch sends four bits of data to the SEB. The SEB will demultiplex and demodulate this channel (or channels for a stereo pair).
(14)
The SEB contains three 2-channel audio amplifiers, each with a 16-step electronic volume control unit. Pressing an up or down volume control switch sends two bits of data to the SEB, causing the electronic volume control to increment or decrement one step.
(15)
The PCU receives the audio waveform from the SEB and makes the signal available at the electrical headset jack. Plugging a headset into the jack allows the electrical inpulses to travel to the headset transducers (speakers), which convert the electrical signal to sound waves which are audible in the passenger's ear.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH PASSENGER ENTERTAINMENT ú
23-34-00
ú ú 05A Page 7 ú Jun 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
(16) The PCU can also supply the electrical impulses to a remote transducer which performs the electrical-to-accoustic conversion using speakers mounted in a box. Plugging a pneumatic headset into the jacks depresses spring loaded plungers allowing the sound waves to travel to the earpieces and be heard by the passenger.
B. BITE
(1)
Turn the PES switch to TEST on the forward attendant's panel, P21.
(2)
At each PCU, make sure the right-hand horizontal piece " -" of the digital display is on.
(3)
Make sure all other pieces of the display are off.
(4)
Turn the PES switch to OFF.
C. Control
(1)
Supply electrical power (AMM 24-22-00/201).
(2)
Turn the PES switch to ON, on the forward attendant's panel, P21.
(3)
Connect a passenger headset into the PCU.
(4)
Set the channel selector to the applicable position.
(5)
Adjust the volume to the the usual level and listen.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH PASSENGER ENTERTAINMENT ú
23-34-00
ú ú 03A Page 8 ú Dec 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
FAULT ISOLATION/MAINT MANUAL
PASSENGER ENTERTAINMENT SYSTEM (PES)
COMPONENT SHT 102 FIG. QTY ACCESS/AREA AMM REFERENCE
BOX - (FIM 23-32-00/101) AMPLIFIER - (FIM 23-31-00/101) VIDEO JUNCTION, M10668 PASS. ADDRESS, M177
BOX - SEAT ELECTRONICS 2 1 EACH PASS. SEAT GROUP 23-34-06
CIRCUIT BREAKER - 1 FLT COMPT, P11
PASS ADRS AMPL, C548 1 11C22 *
CIRCUIT BREAKER - 1 119BL, MAIN EQUIP CTR, P37
ENT TAPE RPDR, C4426 1 37B7 *
MULTIPLEXER, C4403 1 37B8 *
RELAY - (FIM 31-01-36/101) PANEL - (FIM 33-22-00/101) PANEL - (FIM 23-51-00/101) TAPE REPRODUCER POWER, K10600 MUX PWR, K10599 FWD ATTENDANT, P21 MULTIPLEXER - MAIN, M10733 AUDIO SELECTOR, M70 1 1 119BL, MAIN EQUIP CTR, E4-4 23-34-01
REPRODUCER - ENTERTAINMENT TAPE, M130 1 1 119BL, MAIN EQUIP CTR, E4-4 23-34-03
SWITCH - BOARDING MUSIC REMOTE CONTROL, S10179 2 1 PASS. CABIN, P21 PANEL *
UNIT - (FIM 23-42-00/101) AUDIO ACCESSORY, M108 SWITCH - ENTERTAINMENT CONTROL, S10479 2 1 PASS. CABIN, P21 PANEL *
UNIT - PASS. CONTROL 2 1 EACH PASS. SEAT GROUP 23-34-05
* SEE THE WDM EQUIPMENT LIST
Passenger Entertainment System (PES) - Component Index
Figure 101
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 AMM 飛機維護手冊 COMMUNICATIONS 通訊(81)
