Today I needed to change the print density setting on an old HP Laserjet 2200.. I thought it should be an easy job, but it wasn’t..
From Mac OS X there is no GUI way to do this. No way of doing it from a browser either.
Ended up using telnet to send a PJL command to the printer via port 9100.
I used: telnet printer_ip 9100
then pressed esc, and entered: %-12345X@PJL DEFAULT DENSITY=5
I found this command here: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bpl07282&locale=en_US&printver=true