HP LaserJet 3100 All-in-One Printer series - Manual (Page 212)

EN 9 Troubleshooting and Maintenance 211
Solving scanning problems
Use the following table to solve problems with quality of scans. See
also “Solving image quality problems” and “Solving paper feed
problems” in this chapter.
Problem Cause Solution
The message on
the computer
screen says there
is a problem
opening scanner.
Unable to activate
TWAIN source. You may have the wrong type of parallel
port, or it may not be properly connected
to the computer.
Another device is conflicting with the
parallel port.
Be sure that you have connected the
parallel cable that came in your package
to the correct parallel port on the back of
your computer. If you have another
parallel port, try attaching the parallel
cable to the other port. Make sure you
have an SPP- (bi-directional) or ECP-
compliant parallel port on your computer.
An SPP parallel port is the minimum; an
ECP parallel port is strongly
recommended. For more information on
your parallel port, please see appendix C
and your computer’s documentation.
The HP LaserJet 3100 product cannot
share a parallel port. If you have a sound
card, external hard drive, or network
switchbox connected to the same parallel
port as the HP LaserJet 3100 product, the
other device may be interfering. You must
unhook the other device to connect and
use the HP LaserJet 3100 product, or you
must use two parallel ports on the
computer. You may need to add another
parallel interface card. An ECP parallel
interface card is strongly recommended.
Please see appendix C or your
computer’s documentation for information
on installing an additional parallel
interface card or resolving conflicts.
No parallel port is
available or the
parallel port is
being shared by
another device. The HP LaserJet 3100 product must be
directly connected to the computer’s
parallel port. It cannot share the parallel
port with another device. If you have a device such as an external
disk drive or switch box connected to the
parallel port and want to continue using it,
you must get two parallel ports on your
computer.