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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 Action
The server unexpectedly shuts
down, and the LEDs on the
front-panel assembly are not lit.
See “Solving undetermined problems” in the Problem Determination and Service
Guide on the IBM xSeries Documentation CD.
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 Action
The number of serial ports that
are identified by the operating
system is less than the number
of installed serial ports.
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.
A serial device does not work.
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
74 xSeries 206m Types 8485 and 8490: Installation Guide