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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 Hardware Maintenance Manual to determine which components are customer replaceable units
(CRUs) and which components are field replaceable units (FRUs).
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
control-panel assembly are not
lit.
See “Solving undetermined problems” on page 173.
Serial port problems
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 Hardware Maintenance Manual to determine which components are customer replaceable units
(CRUs) and which components are field replaceable units (FRUs).
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 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.
2. Reseat the following components:
a. Failing serial device
b. Serial cable
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. (Trained service technician only) System board
172 ThinkServer TD200 Types 3724, 3808, 3809, 3815, 3817, 3824, 3826, 3836: Installation and User Guide