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14.20 <
Troubleshooting>
Common Macintosh problems
I encounter error
“Cannot open port
device file” when
printing a document.
Please avoid changing print job
parameters (via LPR GUI, for example)
while a print job is in progress. Known
versions of CUPS server break the print
job whenever print options are changed
and then try to restart the job from the
beginning. Since Unified Linux Driver locks
port while printing, the abrupt termination
of the driver keeps the port locked and
therefore unavailable for subsequent print
jobs. If this situation occurred, please, try
to release the port.
Problem Suggested solutions
The document has
printed, but the print job
has not disappeared from
the spooler in
Mac OS 10.3.2.
Update your Mac OS to OS 10.3.3. or
higher.
When print a document
in Macintosh with
Acrobat Reader 6.0 or
higher, colors prints
incorrectly.
The resolution setting in the printer
driver may not be matched with that in
Acrobat Reader.
Make sure that the resolution setting in
your printer driver matches that in
Acrobat Reader.
Problem Possible Cause and Solution