(2)
 Function The function of the SCU is to control and operate the PES video (Ref. Para. 6. Operation).

 (3)
 Control Elements

 (a)
 SYST PWR Pushbutton Switch When you push the SYST PWR pushbutton switch the integral light and the screen comes on. Also power is sent to the VTR.

 (b)
 5-inch LCD (Touch-Screen) A 5-inch LCD is installed to preview the selected video program and shows special touch-screen related indications. The surface of the LCD has 12 segments of transparent membrane switches (touch-screen) which are used to select different system functions and operation procedures (Ref. Para. 6. Operation).

 (c)
 ENTER EXEC Pushbutton Switch When you push the ENTER EXEC pushbutton switch all functions set through the touch-screen are done.

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 System Control Unit (SCU).
 Figure 006

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 (d)
 ENTER PREV Pushbutton Switch When you push the ENTER PREV pushbutton switch the set video program is shown on the screen without cabin presentation. The video program sound is heard over a headset connected to the MONITOR jack.

 (e)
 ENTER MENU Pushbutton Switch When you push the ENTER MENU pushbutton switch the initial menu is shown on the screen.

 (f)
 BRIGHT Control Knob The BRIGHT control knob sets the screen brightness.

 (g)
 PA VOLUME MIN/MAX Control Knob When the PA function is set the PA VOLUME MIN/MAX control knob controls the volume from the cabin loudspeakers.

 (h)
 PA CH1/CH2 Switch When the PA function is set the PA CH1/CH2 switch sets the VTR audio channels which are sent to the CIDS and are heard from the cabin loudspeakers.

 (i)
 MONITOR Jacks The SCU has two types of jacks to connect a stethoscopic or an electrical headset. The jacks are used to monitor the video program sound when the preview function is set.

R **ON A/C 106-149, 211-299, 301-399,
 A. System Control Unit (SCU)
 (Ref. Fig. 006A)

 (1) General
 (a)
 The SCU is installed in the video control center. The SCU contains a computer which receives the aircraft zone configuration from the CIDS director(s). The SCU receives its commands from the front panel with the aid of:

 -A program on a PCMCIA memory card in a slot (changes of the program are possible)
 -The special membrane switches.

 (b)
 Electrical connections are made through connectors on the back of the SCU.

 -The connector for the video input data from the VTR(s) is connected to connector J1.
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 System Control Unit (SCU)
 Figure 006A

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 -Video output data and control data are sent through connector J2 to the LH and RH tapping unit lines.
 -
The connector for the audio input/output data are connected to the connector J3.

 -
The connector for the system power and the control data are connected to the connector J4.

 -
The connector for the RS485 serial data is connected to the connector J5.

 (2) Control Elements The SCU has the subsequent operation controls:
 (a)
 A MASTER POWER pushbutton switch with integral light comes on when the SCU is energized.

 (b)
 A SYSTEM TEST/PASS LED comes on when the self test is completed.

 (c)
 A SYSTEM TEST/FAIL LED comes on when a self test error occurs.

 (d)
 An audio jack for the control of the PES Video sound.

 (e)
 A PREVIEW monitor section.

 (f)
 MODE SELECT section. 1 A MODE SELECT membrane switch sets the AUTO mode, the MANUAL

 1_ A four inch color LCD.
 2_ A MENU pushbutton switch to set the preview mode, the
 video/audio control mode or the airshow/PRAM control mode.
 3_ A PREVIEW SELECT pushbutton switch - sets the video source to
 preview on the monitor and the associated audio channel.
 4_ A VTR indicator comes on when the VTR is selected.
 5_ A PRI indicator comes on when the PRI is selected.
 6_ A SEC indicator comes on when the SEC is selected.
 7_ A digital display shows the video source.

_
 mode or the ALL ZONES mode. 2 An AUTO LED comes on when the AUTO mode is selected.
　
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