Mainframe Interface Board Replacement; Endplate Overlap - HP 16500A Service Manual

HP 16500A/16501A - Service

6-21. Mainframe Interface Board Replacement

1. Turn off the HP 16500A mainframe power switch, then unplug the power cord. Disconnect any input
connections.
2. Disconnect the interface cable from the mainframe interface card (board) by pressing the release
tabs on either side of the cable connector while pulling the connector away from the card.
3. Starting from the top, loosen the thumb screws on filler panels and cards in the HP 16500A
mainframe that are located above the mainframe interface card. Starting from the top, pull the
cards and filler panels halfway out. See figure 6-51.
Figure 6-51. Endplate Overlap
4. Loosen the thumb screws on the mainframe interface card and remove it. Slide the replacement
mainframe interface card into the card cage of the HP 16500A mainframe.
5. Reposition all cards and filler panels so that the endplates overlap properly.
6. Firmly seat the bottom card into the backplane connector of the mainframe. Keep applying
pressure to the center of the card endplate while tightening the thumb screws finger tight.
Repeat for all cards and filler panels in a bottom to top order. See figure 6-52.
Filler panels must be installed in all unused card slots for correct air circulation.
Any filler panels that are not used should be kept for future use.
7. Connect the interface cable to the mainframe interface card located in the HP 16500A mainframe.
In order to ensure correct connection of the interface cable, the 68-pin "D"
connectors on the cable are asymetric in shape. They only fit into the ports on
the cards when oriented to match the shape of the ports.
When reconnecting the interface cable, make sure the cable connector is
properly seated into the port on the expansion interface card by pulling the cable
connector without pressing the release tabs. If the connector is properly seated,
it will remain connected to the port.
6-72
Figure 6-52. Endplate Overlap
Note
Note