Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 11-05-2007 Installation Manual page 477

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 termi-
nate 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 turn on the printer.
23.9.9 Debugging the CUPS Print System
Use the following generic procedure to locate problems in the CUPS print system:
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.
Printer Operation 459