A320飞机维护手册 AMM Communications 通讯2(43)

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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 cabin loudspeakers. 
R  (d) The audio sound level heard from the cabin loudspeakers is set 
R  with the PA VOLUME MIN/MAX control knob on the SCU. 
R  (e) To stop the video presentation, touch the OFF indication on the 
R  SCU touch-screen. The VTR stops and rewinds to the start 
R  position. The video presentation on the HMDU stops and the HMDU 
R  move back into the hatracks. The SCU screen shows the initial 
R  menu.

 

R  D. Special System Operation 
R  (Ref. Fig. 013, 014) 
R  (1) General 
R  (a) The SCU provides a random-access tape operation-function when a 
R  video cassette is used which contains programmed video-segment 
R  data at the start of the tape. These data are automatically read 
R  by the VTR when a programmed cassette is inserted in one of the 
R  VTR. 
R  (b) The data contains information about tape segments recorded on the 
R  tape (location and duration). Each tape segment has a unique 
R  number for segment identification. The SCU provides a special 
R  menu-guided operational procedure to preset tape segments. 
R  (2) Activation 
　
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