Table of Contents
Advertisement
4-4 Replaceable Parts
Firmware PROMs
Board exchanges, and revisions to card frrmware, may require that the PROMs be
removed and replaced. To remove and replace the PROMs:
1.
Remove the PCA as described previously.
2.
Locate the PROMs. Figure 4-1 shows the location designators and
approximate positions of the PROMs on the PCA.
3.
Remove each PROM from its socket, without damaging its socket. We
recommend an integrated circuit removal tool ("chip extractor");
however, you can use a fme rigid device (like a very thin flat-bladed
screwdriver) to initially loosen the PROM from its socket. Note that
excessive prying and pressure can damage the socket and PROM. Use
caution during removal.
4.
Before installing the PROMS, identify the PROM part number and correct
socket into which each PROM must be installed.
5.
Note the half-circle notch located on one end of each PROM that
identifies pin 1 on the PROM. Match it to a similar mark on the empty
socket. Ensure that the contact pins of the PROM are aligned with the
socket receptacles. It may be necessary to adjust the pins (bend them
in or out) for proper alignment. Gently press the PROM into place to
properly seat the pins. If pressure is not uniformly applied, the pins on
one side or the other may fold and collapse without properly mating
into their sockets. (If this occurs, remove the PROM, straighten the pins,
and try again. If damage was extensive, you may need a new PROM.)
o
~
____________________
~I
0
o
PROMs
88
00000
C SAP A
Figure 4-1. Location of PROMs
Advertisement
Table of Contents
Troubleshooting
