In case of printing issues such as no print output, print processes core and others, the first step is to configure the printing logging by inserting the following line into the syslog.conf file

lpr.debug          /var/log/lp.log

Enable this functionality:

# touch /var/log/lp.log

# svcadm refresh svc:/system/system-log:default

It is recommended to enable global collection of core files:

# mkdir /var/cores

# coreadm -g /var/cores/%f.%n.%p.%t.core -e global -e global-setid -e log

With this settings, in case of printing issues collect the following informations

• lp.log file (as configured above)
• /etc/lp/printers/xx/configuration file
• # lpstat -lp output
• # ls -Rail /var/spool/lp
• # ls -Rail /var/spool/print
• the explorer file
• snoop output of the interface where the network printer is connected to
• any eventual core files (under /var/cores/… or as configured)
• each specific information regarding the printer and the method used to configure it