CONTREX CX-1200 - Manual (Page 33)

Page 31
1) If the CX-1200 unit has power connected to it, remove the power. If the CX-1200 has been
mounted in your system, disable it from the system.
2) Remove the connectors on the rear of the CX-1200. Pay careful attention to the location of
each connector so that you can replace them in their proper locations. It is possible to replace
a connector incorrectly.
3) Remove the earth ground screw and ground connections.
4) Remove the four machine screws that hold the back plate in place, and set them aside.
Carefully remove the back plate.
5) Remove the upper option card slot cover plate by removing the two
machine screws.
6) Remove the CPU Board carefully - pull the CPU board straight out so that you do not bend
the card guides or the CPU board, nor damage the internal backplane card-edge connector.
See figure 2-35.
NOTE: Take the appropriate antistatic precautions when you handle the CPU board and the
Analog I/O card.
7) Remove the Analog I/O card from it's antistatic bag, holding it by the edges.
8) Remove the 11-pin terminal strip plug from the 11-pin right angle terminal strip on the Analog
I/O card. Make sure that the screws that hold the round standoffs and the 40-pin connector in
place are secure. Tighten these screws, as needed.
9) Mount the Analog I/O card to the CPU Board by carefully inserting the three long pins of the
Optional Analog connector to the three corresponding holes on the non-component side of the
CPU board, and insert the 40-pin connector on the Analog I/O card into the 40-pin connector
on the CPU board.
10) Verify that the standoffs are flush with the CPU board. Make sure that the 40-pin contacts are
properly aligned.
11) Holding firmly to the edges of both boards to preserve the alignment, carefully flip the boards
so that the component side of the CPU board faces up.
12) Insert the four screws and the attached lock washers into the round standoff holes and alternate
between the screws as you tighten both screws into place snugly. Verify the alignment of the
boards.
13) Reinsert the CPU Board into the CX-1200 unit by aligning the CPU board with the top and
bottom card edge connectors and gently push the board straight back until the CPU board card
edge connector tab seats fully into the internal backplane card-edge connector.
(continued)