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6. TECHNICAL DESCRIPTION
6.1 OVERVIEW
TECHNICAL DESCRIPTION
The 4025TR 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 4025TR.
During servicing, it will be necessary to remove the front panel to gain
access to the modules located inside the 4025TR.
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 4025TR. The front panel assembly
should be placed on the workbench, and should not be left suspended by
the ribbon cable, as this may cause damage.
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 4025TR'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 (632).
The 632 character inserter supervises all communications within the
4025TR. 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 632
character inserter module on the 4025TR.
Model 4025TR Film Footage Encoder Manual
This can be
It will be necessary to
During normal
Page 6-1
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