To restore the original configuration, you simply need to restore the original printcap and lpd.perms file and then restart the lpd server. These operations require ROOT permissions.
h4: {96} # su
h4: {97} # cd /etc OR cd /usr/local/etc
h4: {98} # mv printcap.orig printcap
h4: {99} # mv lpd.perms.orig lpd.perms
h4: {100} # checkpc -f
h4: {101} # lpc reread
h4: {102} # rm -rf /var/spool/lpd/lp /var/spool/lpd/lp2
h4: {103} # rm -f /tmp/lp /tmp/lp2