Overall Architecture
Figure 001
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DMC - Component Location
Figure 002
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3. System Description
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A. DMC The DMC is contained in a 6 MCU main housing, which can hold nine slide-in type electronic boards (seven used, two spares), a slide-in type power supply module and a dog-house mounted on its face. The seven slide-in type electronic boards are as follows:
-
DPU 1 (PFD) board
-
DPU 2 (ND) board
-
DPU 3 (ECAM) board
-
I/O interface 1 board
-
I/O interface 2 board
-
I/O interface 3 board
-W/R board.
The power supply module is a self-contained slide-in type module and
holds three boards:
-Regulator/generator board
-Controller/monitor board
-Filter board.
The dog-house, mounted on the front side of the main housing, holds three
memory modules - memory module 1 (PFD), memory module 2 (ND) and memory
module 3 (ECAM) ; each module is placed in such a manner inside the
dog-house so that it is mounted on top of the corresponding DPU board.
Each memory module, which consists of a separate housing containing a PCB
(printed circuit board), can be individually removed from the dog-house
by means of two clips. The housing has an identification a name plate and
a PCB which holds the memory units.
The additional boards - protection boards 1 and 2 - are mounted on the
mother board inside the DMC.
The mother board provides inter-connections between the various boards,
the power supply module and the ARINC 600 connector. The ARINC 600
connector is mounted on the rear side of the main housing of the unit.
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B. CRT The display unit consists of the following sub-assemblies: (Ref. Fig. 003)
-Cathode ray tube (CRT) assembly; it includes: . a high resolution color CRT (Shadow-mask type) with electrostatic focus and electromagnetic deflection, . deflection yokes, . magnetic shield.
-Very high voltage (VHV) power supply: It provides all the potentials necessary for the CRT (anode, focus and G2 electrodes).
-
One analog board; it includes:
. deflection amplifiers,
. convergence circuits,
. video amplifiers,
. brightness control,
. monitoring circuits.
-
One symbol generator (SG) block
-Interconnection board: It realizes the interconnection between the DU and the DMC and, inside the DU, between the SG board, the analog board and the power supply.
-Low voltage (LV) power supply: The low voltage power supply is supplied with 115V - 400 Hz from the aircraft electrical power.
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CRT - Block Diagram
Figure 003
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4.
Interface
_________
(Ref. ATA 31-62-00-WT)
5.
Component Description
_____________________
A. DMC
(1) General
(a) System operation The configuration of the three DMCs and the six DUs in the EIS ensures redundancy, thanks to switching capabilities of individual DMCs to the DUs. The three DMCs are identical and therefore interchangeable. (Ref. Fig. 004) During normal operation:
-DMC1 drives CAPT PFD, CAPT ND and upper ECAM DU
-DMC2 drives F/O PFD, F/O ND and lower ECAM DU
-DMC3 is a back up (hot spare) unit.
In case of a breakdown of DMC1 or DMC2, the back up DMC3 is
switched on accordingly.
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