IBM 865741Y Handbook - Page 187

Troubleshooting Serial Port Problems The serial port cannot be accessed, or the number of serial ports displayed is less than the number of serial ports installed. A serial device does not work. Action Verify that: 1. Each port is assigned a unique address. To verify the address, run the Configuration/Setup Utility program, and select Devices and I/O Ports. See "Devices and I/O Ports" on page 30 for additional information. 2. The serial-port adapter, if you installed one, is properly installed and firmly seated. For information on installing adapters, see "Installing or Removing Adapters" on page 61. If the items above are correct, have the system serviced. Verify that the serial port is enabled and is assigned a unique address. If the items above are correct, have the system serviced. Universal Serial Bus (USB) Port Problems The USB ports cannot be accessed, or the number of serial buses displayed is less than the number of serial buses installed. A USB device does not work. Action Verify that: 1. Each bus is assigned a unique address. 2. Each port is assigned a unique address. To verify the address, run the Configuration/Setup Utility program, and select Devices and I/O Ports. See "Devices and I/O Ports" on page 30 for additional information. 3. The USB device is properly installed and firmly seated. 4. The serial-port adapter, if you installed one, is properly installed and firmly seated. For information on installing adapters, see "Installing or Removing Adapters" on page 61. If the items above are correct, have the system serviced. Verify that: 1. The USB is enabled and is assigned a unique address. For information on using the Configuration/Setup Utility program, see "Using the Configuration/Setup Utility Program" on page 28. 2. The USB clock speed matches the clock speed of the USB device. If the items above are correct, have the system serviced. Chapter 5. Solving Problems 169