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2.5
Installation
2.5.1
Before attempting installation of the 2251A, carry out a visual inspection of the
counter. Pay particular attention to connectors P1 and P2 on the rear of the counter,
and ensure there are no bent, damaged or missing pins. Repair any damage to the
counter before proceeding.
2.5.2
To install the 2251A in a C size, VXI mainframe, ensure the 2251A has rear connector
P1 oriented to mate with the corresponding connector on the mainframe backplane.
Align the 2251A with the guides for the slot selected, and slide the counter into the
mainframe. Push the counter home to connect the 2251A to the mainframe. Secure
the 2251A to the mainframe with the captive screws provided at the top and bottom
edges of the counter.
2.5.2.1
Poor mechanical alignment of 2251A rear connectors P1 and P2 may require the
counter be reseated in the VXI mainframe. Do NOT use undue force to seat the
counter.
2.5.3
Power-up the mainframe. Ensure the SYSFAIL LED on the 2251A front panel lights
and extinguishes after a few seconds to show the counter has passed its power-up
self test. The 2251A is now ready for use.
2.5.4
To remove the 2251A from the VXI mainframe, power-down the mainframe, and
release the captive screws that secure the 2251A to the mainframe. Use the plastic
levers provided on the top and bottom edges to eject the 2251A from the mainframe.
Pull the counter along the guides provided and out of the mainframe.
2-2
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Figure 2-1 Location of Switches
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