Serial Port Problems - IBM 8485E2U Installation Manual

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Problem Determination and Service Guide to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
The server unexpectedly shuts
down, and the LEDs on the
front-panel assembly are not lit.

Serial port problems

For more information about the serial port, see the User's Guide on the IBM xSeries
Documentation CD.
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Problem Determination and Service Guide to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
The number of serial ports that
are identified by the operating
system is less than the number
of installed serial ports.
A serial device does not work.
74
xSeries 206m Types 8485 and 8490: Installation Guide
Action
See "Solving undetermined problems" in the Problem Determination and Service
Guide on the IBM xSeries Documentation CD.
Action
1. Make sure that:
v Each port is assigned a unique address in the Configuration/Setup Utility
program and none of the serial ports is disabled.
v The serial-port adapter (if one is present) is seated correctly.
2. Reseat the serial-port adapter.
3. Replace the serial-port adapter.
1. Make sure that:
v The device is compatible with the server.
v The serial port is enabled and is assigned a unique address.
v The device is connected to the correct connector. (For connector locations,
see the User's Guide on the IBM xSeries Documentation CD.)
2. Reseat the following components:
a. Failing serial device
b. Serial cable
c. Remote Supervisor Adapter II (if one is present)
3. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Failing serial device
b. Serial cable
c. Remote Supervisor Adapter II (if one is present)
d. (Trained service technician only) System board