Specifications
Page 3-14 AM-3000M/LC Hardware Installation
3.334-PIN X-BUS CABLING PRECAUTIONS
If you’ve already connected the X-bus cables to the AM-987 connectors and labeled the
ends as previously suggested, you may skip the following message and proceed to the
next installation step!
Up to this point the upgrade installation instructions have been fairly straightforward.
However, installing the inter-connecting X-bus cables can be a bit tricky since the
connectors on the AM-987 board are completely hidden by the Roadrunner board and
mounting bracket. You must take every precaution to install the X-bus cables correctly,
as reversing the cables may cause serious damage to the AM-174 Roadrunner board!
If you can not visually verify the cable connections on the AM-987 board, you may need
to unplug it from the CPU board and move it down until the X-bus connectors are
visable. You can then safely connect the cables from the AM-987 board to the AM-174
Roadrunner. After the cables are routed correctly, you can reposition the AM-987 over
the CPU socket on the AM-140 board and
carefully
reinstall it.
3.3.1AM-987 to AM-174 34-Pin X-bus Cabling Instructions
To make the X-bus cable connections between the AM-987 and AM-174 boards, refer to
the next illustration and make the following connections. Be sure to observe the
correct pin-1 orientation.
1.Connect one 34-pin X-bus cable to P1 on the AM-987 board.
If not already installed!
2.Route the cable under the Roadrunner mounting bracket toward the front
of the system.
3.Lift the cable up over the Roadrunner board and make a 90 degree fold so
that the cable connector can be plugged into J2 on the Roadrunner board.
Note that this cable will lay over the other X-bus connector at J3.
4.Connect the second 34-pin X-bus cable to P2 on the AM-987 board.
If not already installed!
5.Again route this cable under the Roadrunner mounting bracket toward the
front of the system, then up and over the AM-174 board. This cable will lay
on top of the first X-bus cable on the AM-987, and then run under it when
wrapped over the top of the AM-174 board.
6.Make a similar 90 degree fold in the cable so that this connector can be
plugged into J3 on the AM-174 Roadrunner board.
Note that this cable will
be plugged in under
the first X-bus cable.
7.If you’ve unplugged the AM-987 from the AM-140 CPU board to make
these connections (as explained under "Cabling Precautions"), be sure to
carefully
plug the AM-987 back into the CPU socket when done.
PDI-00172-60, Rev. A02