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a character generation digital board (A4) which generates the shape of each character
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a character generation analog board (A5) which stands as a digital-to-analog converter and gives orders to the deflection system
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a video-preamplifier board (A6) which receives the color signals and generates the brightness of each gun
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a video unit (A7) which consists of the amplifier and the CRT
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a low-voltage power supply unit (A1) which generates voltages to supply the circuits and check the video unit.
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a high-voltage power supply unit (A8) which generates the voltages to supply the CRT.
4. Operation
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A. Multifunction Usage
(1) Functioning
(Ref. Fig. 007) R The MCDU is linked to both FMGCs, CFDS, and optional systems. R
At power-up or after a long term power interrupt, the MCDU
communicates with the FMGC and the A/C STATUS page is displayed.
To initiate communications with another system other than the FMGC,
the pilot presses the MCDU MENU mode key. Then a menu page is
displayed (item a) indicating which system is currently active
(green) and any system requesting service (white with (REQ) displayed
with a space immediately after each menu system identifier).
(Ref. Fig. 007)
If the operator does not press any line key after 60 seconds, the
MCDU does one of the following actions:
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if an active system exists, the MCDU allows the active system to control the display,
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if no active system exists, the MCDU will continue to display the MCDU MENU page.
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MCDU - Functional Layout Figure 004
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MCDU Components Figure 005
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INTENTIONALLY BLANK
R 1 1
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MCDU - Block Diagram
Figure 006
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Functioning
Figure 007
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If the operator presses the line key adjacent to the desired system, communication is broken with the active system and established with the selected one. If the line select key corresponds to the currently active system, the communication continues with the system. During the time between selecting the system and receipt of the first text from the selected system, the display as shown in figure (item b) appears. (Ref. Fig. 007) If communication with the selected system is not established, the MCDU displays the data as shown in figure (item c). (Ref. Fig. 007) When a system other than the currently active desires to communicate with the MCDU, it illuminates the MCDU MENU annunciator on both MCDUs to warn the operator. The operator has to press the MCDU MENU mode key to have the MCDU MENU page to know what system is requesting the MCDU. - When a system other than the FMGC is the active one, pressing any FMGC mode key activates the FMGC. - At the same time both MCDUs may communicate each with a different system. (MCDU 1 - DATA LINK) (MCDU 2 - FMGC) - When the FMGC is not the active system, if it has to send an important message, it illuminates the FMGC annunciator.
(2) Data fields
(a) 1L - FMGC : allows to activate communication with the FMGCs (A/C status page displayed).
(b) 2L - DATA LINK : allows to activate communication with the DATA LINK.
(c) 3L - AIDS : allows to activate communication with the AIDS.
R (d) 4L - CFDS : allows to activate communication with the CFDS.
R (e) 5L - ATSU : allows to activate communication with the ATSU.
R (f) 6R - RETURN : allows to return to the currently active system.
R R (g) "(REQ)" may be displayed on any line (1L - 5L) with a space immediately after the requesting system ident to indicate that the system is requesting the MCDU. "(TIME OUT)" may be displayed if the communication is not established with the system.
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When MCDU MENU mode key has been pressed, SELECT DESIRED SYSTEM is displayed.
