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Passenger Control Unit (PCU)
R Figure 013B
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R **ON A/C 051-099, 201-210,
The Passenger Control Units (PCU) 200MK and 201MK are the primary interfaces between the passengers and the MPES. They are installed in the armrest of each passenger seat. Each PCU has: - a LED display (2 digit LED indicates the channel select), - Up/Down pushbutton switch (channel select), - Up/Down pushbutton switch (volume control), - an acoustic transducer that supplies pneumatic headset connectors and/or - an electrical headset jack.
(1) Electrical Components Interface
R **ON A/C 051-099,
(Ref. Fig. 014)
R **ON A/C 201-210,
R (Ref. Fig. 014B)
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The electrical components are used to process commands for the channel selection and the volume control. The PCU communicates with the SEB through the SEB to the PCU cable assembly. The microprocessor reads the volume control and channel selector settings (during the BITE operations, it checks the transducer continuity). The microprocessor transmits the volume, the channels and the BITE information to the SEB, and displays the channel on the LED display. The SEB supplies power and demultiplexed audio signals for the transducer and/or the electrical headset jack. The transducer changes the electric audio signals to sound energy. The passenger hears the music by a pneumatic headset connected to the transducer socket, or by an electric headset connected to the jack on the PCU (the pneumatic headset connector is mechanically interlocked to prevent audio leakage when no headset is connected). If the power is stopped for more than 0.2 s, the PCU circuitry decreases the system volume.
(2) Not Applicable
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Passenger Control Unit (PCU)
R Figure 013C
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R DPCU Electrical Interface Block Diagram
R Figure 014
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Passenger Control Unit Electrical Interface
Figure 014A
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Passenger Control Unit (PCU) Electrical Interface Block Diagram R Figure 014B
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A. Main Multiplexer
(Ref. Fig. 007A, 015)
(1)
General The Main Multiplexer (MM) 8MK is installed in the avionic compartment. The MM has 25 total audio inputs. These inputs are:
-16 audio inputs channels from the Audio Reproducer,
-6 audio inputs channels from the PES Video System,
-3 audio inputs channels from the Passenger Adress.
(2)
Function
The MM provides the following general functions:
-multiplex of analog audio sources into a single PCM data stream that is distributed to SEB throughout the aircraft,
-decode and processing of 7 input keylines (3 Video/3 PA/1 PES test) for a maxium of 3 Video zones and 3 PA zones,
-BITE processing and reporting via the CICS data bus,
-processing of the system configuration layout data from the CICS data bus.
The MM supports followings methods of loading channel configuration and mapping tables:
-encoded A/R audio disks,
-PCU manual entry,
-serial maintenance port,
-ARINC 485 interface to Sony PSCU.
(3)
Control Elements
The MM has these control elements:
-
a momentary switch to initiate Download and Bite,
-
a green contol-LED to indicate the Power on,
-an amber control-LED to indicate the status of the unit.
B. Compact Disk Audio Reproducer
(Ref. Fig. 016)
(1) General The Compact Disk Audio Reproducer (CD A/R) 10MK is installed in the avionic compartment. The CD A/R contains four identical CD decks, and are numbered "No.A" thru "No.D". Each deck drives one CD. Up to two stereophonic channels or four monophonic channels provides each CD drive. The CD A/R gives up to 16 different music programs, from CDs, to the Main Multiplexer. 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM Communications 通訊1(169)
