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 **ON A/C 301-399,
 D. Tapping Unit (Ref. Fig. 009A)
 (1) General
 (a) 10 tapping units are installed along each passenger-compartment lateral wall. Each tapping unit has an interface with a maximum of 2 HMDUs.
 (b) Electrical connections are made through 4 connectors. The first tapping unit of each data-line receives the video and control data sent from the SCU through connector J2. The same data is connected through connector J3 to the adjacent tapping unit input-connector J2. The first and the fifth tapping unit are supplied with 115VAC. These inputs are then connected to the next four tapping units. The last tapping unit ends with a termination plug connected to connector J3.
 (2) Function Video and control data sent from the SCU are connected to a related display unit through the tapping units. 
R  **ON A/C 051-099, 106-149, 151-199, 201-299, 301-399,
 6. Operation_________ 
R  **ON A/C 051-099, 
R R  A. Energization (Ref. Fig. 010) 
R R  (1) Power for the PES video is available when the busbar 210XPB is energized and the circuit breakers 21MH, 22MH and 23MH are closed. 
R R R  (2) The SCU and the VTRs are energized when the SYST PWR pushbutton switch on the SCU is pushed. Then the initial menu is shown on the SCU touch-screen. 
R R  (3) The HMDUs are energized through the SCU touch-screen (Ref. Para. 6.C.). 

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 SCU Power-on and Initial Menu
 Figure 010

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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. 

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 Video Program Preview Function - Activation
 Figure 011

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 Normal Operation - Menu Selection
 Figure 012

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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 
　
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