a. Check the modem, modem cable, and serial port for loose or unconnected cables. Reset the
service processor using the pinhole reset switch on the primary I/O drawer operator panel.
b. If the hang repeats, check with service support to see if there is a firmware update that fixes the
problem.
c. If there is not, or the update does not fix the problem, replace the following FRUs one at a time in
this order:
1) Modem cable
2) Modem
3) I/O backplane in the primary I/O drawer
d. If this procedure does not fix the problem, call service support.
Chapter 4. Checkpoints 143
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