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Dell Inspiron 7000 Reference and Troubleshooting Guide
Another possible cause for errors is a problem with the external device itself. Use the
documentation that came with the peripheral to troubleshoot it and confirm that it is
working properly.
If the external device is not properly installed through software, the device also may
not function properly. Try operating the device from different programs or through the
operating system. If it still does not work, you can eliminate the software configura-
tion as the cause of the problem.
Although the following symptoms can be caused by faulty peripherals or software
errors, these symptoms might also suggest a port problem:
If a peripheral works intermittently, or produces intermittent errors, the port may
be faulty.
If the computer displays an error message that is related to the external device
connected to a port, but corrections to the device do not resolve the error, run the
appropriate subtest in the Serial/Infrared Ports test group.
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The four subtests in the Serial/Infrared Ports test group confirm the following port
functions:
Serial/Infrared Baud Rate Test
Checks the baud rate generator in each serial communications chip against the
computer’s clock.
Serial/Infrared Interrupt Test
Checks the serial port’s ability to send IRQs to the microprocessor.
Serial/Infrared Internal Transmission Test
Checks several internal functions of the serial port using the internal loopback
mode of the serial communications chip.
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The subtests in the Parallel Ports test group check the computer’s interface with
external devices, such as a printer, that are connected to the computer through the
parallel port. The subtests in this test group are not intended as a diagnostic test for
the actual peripheral attached to each port.
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If the diagnostics does not recognize the computer’s parallel port, check the
Parallel
Port
option in the
System Devices
menu of the Setup program to see if the port has
been disabled. (See Chapter 2, “Customizing System Features,” for information on
using the Setup program.) The subtests in the Parallel Ports test group cannot test a
port unless it is enabled.
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