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Serial-device problems

Use this information to solve serial-device problems.

Table 1. Serial-device problems.

A table with one spanned column at the top and two additional columns with headers. This table provides information about symptoms and user actions to solve serial-device problems.

  • Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved.
  • See Parts listing, Lenovo System x3750 M4 Type 8753 to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).
  • If an action step is preceded by (Trained service technician only), that step must be performed only by a Trained service technician.
SymptomAction
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 the following conditions are met:
    • Each port is assigned a unique address in both the Setup utility and the operating system, and none of the serial ports are disabled.
    • 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 the following conditions are met:
  2. Reseat the following components:
    1. Failing serial device
    2. Serial cable
  3. Replace the components listed in step 2 one at a time, in the order shown, restarting the server each time.
  4. Replace the serial adapter (if one is installed).
  5. (Trained service technician only) Replace the system board.