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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.).
R 1EFF : 051-099, 106-149, 151-199, 201-299, 1 23-36-00Page 54 1301-399, 1May 01/05 1 1 1CES 1
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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