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“main” (Installation and Administration) — 2004/6/25 — 13:29 — page 316 — #342
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3. Some data may still be transferred to the printer even though the
print job has been deleted from the queue. Check if a CUPS back-end
process is still running for the respective queue and terminate it. For
example, for a printer connected to the parallel port, the command
fuser -k /dev/lp0 can be used to terminate all processes that are
still accessing the printer (more precisely: the parallel port).
4. Reset the printer completely by switching it off for some time. Then
insert the paper and power the printer on.
13.7.9 Troubleshooting the CUPS Print System
Use the following procedure to locate problems printing with CUPS.
1. Set LogLevel debug in /etc/cups/cupsd.conf.
2. Stop cupsd.
3. Remove /var/log/cups/error_log* to avoid having to search
through very large log files.
4. Start cupsd.
5. Repeat the action that led to the problem.
6. Check the messages in /var/log/cups/error_log* to identify
the cause of the problem.
316 13.7. Printer Hardware