Troubleshooting A Serial I/O Device - Dell OptiPlex GX100 User Manual

See the documentation for the printer and for your operating system for instructions on reinstalling the printer driver.
2. Turn off the parallel printer and computer, replace the parallel printer interface cable with a known working cable, and turn on the parallel
printer and computer.
If the problem is resolved, the original printer cable was faulty.
3. Run the parallel printer's self-test.
If the test fails, the printer is faulty.
If the problem still is not resolved, the system board may be faulty. See

Troubleshooting a Serial I/O Device

If the information in "Troubleshooting Basic I/O
the following steps in the order indicated until the problem is resolved:
1. Attach the serial device to the other serial port (for example, if it is currently connected to serial port 1, attach the device to serial port 2).
If the problem is resolved, the serial port on the system board is faulty. See
2. If the faulty device has a detachable serial cable, replace the serial cable.
If the problem is resolved, the serial cable was faulty.
3. Replace the faulty serial device.
If the problem is still not resolved, the system board may be faulty. See
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"Getting
Functions" indicates that the problem is with a device connected to one of the serial ports, perform
"Getting
Help" for instructions on obtaining technical assistance.
"Getting Help" for instructions on obtaining technical assistance.
Help" for instructions on obtaining technical assistance.>