A319 A320 A321 飞机维护手册 AMM Aircraft Maintenance Manual 14_部分3.pdf350页

(2) Control Elements The CD A/R itself has the subsequent operation controls: - a monitor jacks (monaural headset) for sound check, - a channel up and down pushbutton for channel selection, - a volume up and down pushbutton for volume selection, - a two-digit channel number display, - four disk drive diaplays. C. Wall Disconnect Box (Ref. Fig. 009A, 010A) (1) General The function of the Wall disconnect Box (WDB) 50MK is to provide interface, power and communication, between the MM and Seat Electronics Boxes (SEB) 100MK. (2) Functionality WDB provides the following functionality: - pass through of PCM data from an upstream WDB or MM to a downstream WDB, - distribution of PCM data from an upstream WDB or MM to locally connected SEB chain, - passive interconnection of adress token signals to locally connected SEB as well as upstream and downstream WDB, - passive interconnection of uplink data from local SEB chains to upstream WDB, - distribution of 115V power to downstream WDB and locally connected SEB. The last WDB in a column is connected at its downstream output with a termination plug. D. Seat Electronic Box (Ref. Fig. 011A, 012A) (1) General The SEB only changes the digital signals of the passenger selected channel back to the original analog form. These signals are transmitted to the PCU. Each SEB supplies up to 3 PCU. (2) Transmission from/to SEB The SEB transmits: - the 3,3VDC to the PCU, - the 20V to the WDB, - the music signal to the PCU, - the video sound signal to the PCU.,

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