A320飞机维护手册 AMM Communications 通讯2(44)

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R  (a) When the system is energized and a programmed cassette is 
R  inserted into one of the VTR the initial menu is shown on the SCU 
R  screen. The initial menu shows the aircraft symbol, the VIDEO 1, 
R  VIDEO 2 and the PA indication. 
R  (b) To use the random-access tape operation-function, touch the 
R  aircraft symbol and the VIDEO 1, VIDEO 2 indication on the 
R  touch-screen. All the subsequent settings are menu-guided and 
R  self-explained. They are shown in Fig. Random-Access Tape 
R  Operation - Example. This figure shows an example how to preset 
R  tape segment #1 with sound distribution in the cabin and 
R  subsequently tape segment #3 without sound distribution in the 
R  cabin. 
R  E. Decompressurization 
R  If a rapid cabin decompression occurs a ground signal from the cabin 
R  decompression sensor is sent to the SCU. The SCU then controls the 
R  retraction of all HMDU and the PES video is de-energized. 
R  (1) Not Applicable

 

R  **ON A/C 201-210, 
R  A. Energization 
R  (Ref. Fig. 010) 
R  (1) The electrical power for the PES video is available when: 
R  - The busbars 210XP-A, 210XP-B and 210XP-C are energized 
R  - The circuit breakers 21MH, 22MH, and 24MH are closed 
R  - The relay 800MH operates. 
R  (2) The SCU and the VTRs are energized when the SYST PWR pushbutton 
R  switch on the SCU is pushed. Then the initial menu is shown on the 
R  SCU touch-screen. 
R  (3) The HMDU are energized through the SCU touch-screen (Ref. Para. 
R  6.C.). 
R  B. Video Program Preview Function 
R  (Ref. Fig. 011) 
R  (1) General 
R  The video program preview function lets the operator preview a set 
R  video program on the SCU screen without cabin presentation. 
R  (2) Activation 
R  (a) When the system is energized and a cassette is inserted into one 
R  of the VTRs the initial menu is shown on the SCU screen. To set 
R  the preview function, push the PREV pushbutton switch. Now all 
R  operational procedures are guided through special information and 
R  indications on the SCU touch-screen. 
R  (b) To preview the VTR 1 video program, touch the VIDEO 1 indication, 
R  to preview the VTR 2 video program, touch the VIDEO 2 indication. 
R  The screen changes and the operational symbols of the VTRs (REW, 
R  PLAY, FF and STOP) are shown. You can control the VTR2 through 
R  these touch-screen symbols. To start the VTR, touch the PLAY 
R  symbol. The VTR then starts to operate and the video program plus 
R  the operational symbols are shown on the SCU-screen. The video 
R  program sound is heard over a headset connected to the MONITOR 
R  jack. 
R  (c) To stop the preview function, touch the STOP symbol on the SCU 
R  screen. To get the initial menu, push the MENU pushbutton switch 
R  on the SCU.

 

R  C. Normal System Operation 
R  (Ref. Fig. 012) 
R  (1) General 
R  During normal system operation the VTR video program can be set for 
R  cabin presentation with or without audio sound distribution through 
R  the cabin loudspeakers. You can control the VTRs with the SCU 
R  touch-screen. 
R  (2) Activation 
R  (a) When the system is energized and a cassette is inserted into one 
R  of the VTR the initial menu is shown on the SCU screen. The 
R  initial menu shows the aircraft symbol, the VIDEO 1, VIDEO 2 and 
R  the PA indication. 
R  (b) To show the VTR video program in the cabin with video sound 
R  distribution through the cabin loudspeakers, touch the aircraft 
R  symbol, the VIDEO 1, VIDEO 2 and the PA indications on the SCU 
R  touch-screen in sequence. 
R  (c) To do these settings push the EXEC pushbutton switch on the SCU. 
R  The selected VTR starts to operate and the HMDUs move down out of 
R  the hatracks and show the set video program. The video sound is 
R  heard over the headset connected to the PCU when channel 1 or 2 
　
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