European A3and A4 size paper shouldn't have anything to do with network
printing. Is this a printer being newly configured on the HP-3000? If so,
can you get anything to print? Try something basic like...
:FILE MYLJ;DEV=1200
:LISTF @,2;*MYLJ
If nothing prints, does the display panel on the LJ show anything?
Run a self-test type printout from the 4Si and check it's internal hardware
configuration. Specifically, check your IP address. Can you print to this
printer form anything besides the HP-3000? Most of these problems end up
being something very simple.
Wayne Boyer