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6.
TECHNICAL DESCRIPTION
6.1.
OVERVIEW
TECHNICAL DESCRIPTION
The 4025 is built up from three EV-BLOC 610 series modules. Each of
these modules is equipped with high speed serial communications
hardware and a powerful protocol designed specifically for the EV-BLOC
system, which permits data interchange between different modules within
the 4025.
During servicing, it will be necessary to remove the front panel to gain
access to the modules located inside the 4025. This can be accomplished
in a few seconds by turning the quick release fasteners, located at the left
and right hand sides of the front panel, several turns counter clockwise.
The front panel assembly pulls off showing the three main circuit modules
that comprise the 4025. The front panel assembly should be placed on the
work bench, and should not be left suspended by the ribbon cable, as this
may cause damage. It will be necessary to remove the grounding strap
from the left side of the front panel assembly before it can be fully
detached.
To replace the front panel assembly, attach the grounding strap to the
mounting screw on the left side of the display board, making sure that the
ground lug does not come into contact with the live circuitry on the display
board.
Slide the front panel assembly into place, and turn the quick
release fasteners clockwise until they are firmly secured.
Figure 6-1 shows a block diagram of the 4025's internal construction. The
module on the left is the LTC/VITC time code reader (611), the one in the
centre is the LTC/VITC generator (615), and the one on the right is the
video character inserter (631).
All communications within the 4025 are supervised by the 631 character
inserter. The function of the system controller is to establish the location
(i.e.. slot number) and type of each module installed in the frame, and to
schedule the use of the serial bus by other modules.
operation, installation or removal of a module causes the bus controller to
re-configure the system and add or delete the module from bus scheduling.
In addition, the display/keypad circuit card is connected to the 631
character inserter module on the 4025.
Model 4025 Film Footage Encoder Manual
During normal
Page 6-1
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