UPGRADING REPAIRING PCs

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Chapter 7—Parallel Ports, Printers, Scanners, and Drives
Troubleshooting Parallel Port and
Other Types of Scanners
Scanners are among the most popular add-ons to computers, but
they can cause plenty of problems for users. Use Table 7.11 to help
make scanning trouble-free.
Table 7.11 Scanner Troubleshooting
Interface Type Problem Causes Solution
Parallel Slow scanning Wrong port Use ECP or EPP
speed setting mode per scanner.
Scanner not Problems with Shuffle order of scanner and
recognized daisy-chain non-printing device; check
when scanner port settings; try scanner by
used with itself; install second parallel
non-printer port; make sure SCSI/
devices or Parallel scanner set for
as third item parallel mode; check device
(printer, driver setup during boot;
scanner, and and set SCSI/Parallel
anything else) scanner for SCSI mode;
check cable.
SCSI Scanner not Termination Terminate scanner only if
recognized set wrong; last device in SCSI daisywrong
SCSI chain; look for switch or
ID; no terminating plug and check
drivers operation; check SCSI IDs
installed already in use and select an
unused number; install
TWAIN or ISIS drivers as
well as SCSI drivers; check
cable.
USB Scanner not USB port not Enable USB port in BIOS or
recognized working or install card; check port for
not present IRQ conflict; use Windows
98, ME, or 2000 to avoid
support problems with
Windows 95B; get updated
drivers; check cable.
All Scanner worked TWAIN.DLL Use Windows 98’s Version
with Windows file was Conflict Manager to
95, but not replaced by determine if TWAIN.DLL
after Windows Windows 98 was replaced; use the
98 upgrade original version (backed up
by VCM).
Scanner not Scanner turned Turn on scanner, open
recognized off when system Windows 9x/Me/2000’s
booted Device Manager and refresh
devices; if this doesn’t work,
leave the scanner on and
reboot the system.