R R R R (b) The data contains information about tape segments recorded on the tape (location and duration). Each tape segment has a unique number for segment identification. The SCU provides a special menu-guided operational procedure to preset tape segments.
R (2) Activation
R R R R (a) When the system is energized and a programmed cassette is inserted into one of the VTR the initial menu is shown on the SCU screen. The initial menu shows the aircraft symbol, the VIDEO 1, VIDEO 2 and the PA indication.
R R R R R R R R (b) To use the random-access tape operation-function, touch the aircraft symbol and the VIDEO 1, VIDEO 2 indication on the touch-screen. All the subsequent settings are menu-guided and self-explained. They are shown in Fig. Random-Access Tape 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 HMDU and the PES video is de-energized.
R (1) Not Applicable
**ON A/C 301-399,
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 VCC MASTER POWER SWITCH 901MH switch is in the ON position - 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 VTR. Open the door of the MANUAL CONTROL on the SCU (down to 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. In the VTR CONTROL area push the SEL membrane switch until the SEL/VTR display shows 1 and push the PLAY membrane switch. The VTR 1 12MH video program is shown on the SCU monitor.
(b)
To stop the preview, push the STOP membrane switch in the VTR CONTROL area.
(c)
To preview the VTR 2 13MH video program, push repeatedly the PREVIEV SELECT membranen switch until the PREVIEV SELECT display shows 2. In the VTR CONTROL area push the SEL membrane switch until the SEL/VTR display shows 2 and push the PLAY membrane switch. The VTR 2 13MH video program is shown on the SCU monitor.
(d)
To stop the preview function, push the the MASTER POWER pushbutton switch.
C. Normal System Operation
(1) General During normal system operation the VTR video program can be set for cabin presentation with or without audio sound through the cabin loudspeakers.
1EFF : 301-399, 1 23-36-00Page 73 1 1 May 01/05 1 1 1CES 1 (2) Activation
(a)
To set the VTR 1 12MH as the video source, push the SEL membrane switch in the ALL ZONES area until the VTR/AUX/SOURCE display shows 1. In the VTR CONTROL area push the SEL membrane switch until the SEL/VTR display shows 1 and push the PLAY membrane switch.
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