A320飞机维护手册 AMM Communications 通讯2(41)

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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 
R  is selected and from 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 WMDU ant the HMDU stops 
R  and the HMDUs move back into the hatracks. The SCU screen shows 
R  the initial 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 
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 

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 Random-Access Tape Operation - Example (Sheet 1/2)
 Figure 013

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 Random-Access Tape Operation - Example (Sheet 2/2)
 Figure 014

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R R R R  Operation - Example. This figure shows an example how to preset tape segment #1 with sound distribution in the cabin and subsequently tape segment #3 without sound distribution in the cabin. 
R R R R  E. Decompressurization If a rapid cabin decompression occurs a ground signal from the cabin decompression sensor is sent to the SCU. The SCU then controls the retraction of all HMDUs and the PES video is de-energized. 
R  (1) Not Applicable 
R  **ON A/C 106-149, 211-299,
 A. Energization (Ref. Fig. 015A)
 (1) The PES video is supplied with power, when: - The busbars are energized. - The circuit breakers are closed.
 (2) The SCU, VTR1 12MH and the VTR 2 13MH are energized when: - The MASTER POWER pushbutton switch on the SCU is pushed (the light in the MASTER POWER pushbutton switch is on). - The SCU does not receive a cabin decrompression signal.
 (3) When the system is energized, the green PASS LED of the SYSTEM TEST is on and the cassettes are inserted into the VTRs. Open the door of the MANUAL CONTROL on the SCU (downto the right). You control and operate all functions of the system from the SCU.
 B. Video-Program Preview Function
 (1) General The video program preview function lets the operator preview a set video program on the SCU screen without cabin presentation.
 (2) Activation
 (a) To preview the VTR 1 12MH video program, push repeatedly the MENU membrane switch for the selection of the PREVIEW mode. Push the PREVIEV SELECT membranen switch until the PREVIEV SELECT display shows 1 and connect a headset to the MONITOR AUDIO connector on the SCU. 

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 Passenger Entertainment System (Video) - Interconnection
 Figure 015

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 Passenger Entertainment System (Video) - Interconnection
 Figure 015A
　
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