~~------------------
~
945423-9701
7.
Connect plug P2 (9-pin socket)
of
the data cable to jack
J2
on the rear
of
the display
unit.
8.
On the power supply/logic board in the display
unit
is
a video compensation circuit. This
circuit has two gain settings selected by switch
or
jumper
plug configuration. Remove the
top
cover
of
the VDT for access
to
the gain selector.
9. Set the video compensation circuit to the
L position
if
the length
of
the cables between
the terminal and the
computer
is
305 metres (1000 feet)
or
more; otherwise, configure
the circuit to the S position.
NOTE
The video compensation circuit should be set for optimum display
clarity regardless
of
cable length.
2.6 CONNECTION
TO COMPUTER
The VDT controller circuit board may be installed in either the main chassis
of
the
computer
or
in
an
expansion chassis that
is
connected
to
the computer.
In
all cases the
computer
and/or
expansion chassis equipment must be installed and operating properly. Refer
to
the Computer
System Hardware Reference Manual for computer installation instructions. Before installing the
VDT controller circuit board, reference table 2-2 to verify
that
the controller
on
hand supports
the associated VDT(s).
2.6.1
LOCATION
OF
CONTROLLER CIRCUIT BOARD. The physical location
of
the circuit
board within either the
computer
or
the expansion chassis determines the CRU address
that
the
controller circuit board responds to. Therefore, before deciding upon a chassis location for the
new circuit board, determine the address that the system software expects it
to
recognize. Refer
to
the configuration label on the
top
of
the computer chassis to determine the location in the
chassis corresponding
to
the expected address. Refer to table 2-3 to determine the expansion chassis
corresponding
to
the base address.
2.6.2 INSTALLING THE CONTROLLER. Once the proper location for the VDT controller
circuit board has been determined, the controller may
be
installed
in
the computer
or
expansion
chassis and connected
to
the terminal cables. Perform the following steps to complete that
procedure:
I . Set the POWER switch on the front
of
the
computer
or
expansion chassis to the
OFF
position to remove ac power from the unit.
NOTE
The VDT controller circuit board (figure 2-6) has two plastic
pivoted tabs (card ejectors) on the end
of
the board. This end
is
the outside edge
of
the circuit board. The opposite edge
of
the
circuit board inserts into the connectors
in
the computer chassis.
2-9
Digital Systems Division
To Next Page
Loading...
Need help?
General
