USB printer

[Alexander]

Hi2all!
I have trouble with USB printer (and scanner) on FreeBSD.
I use for print cupsd. After print one task on printer and run second 
task - I recieve error message from cups (on localhost:631) like Printer 
busy, try again after 30 sec. dmesg show message like: "ulpt0: offline".
How can I resolve this trouble? Printer don't work correct also on 5.3 
and 6-Current - when it was current.

PS: Printer Samsung ML1520P