Merv,
Check the PostScript Supplement manual that came with the L100. It contains a
section on setting the margins. You do have to take into consideration the
height, width and offset of the page that you expect to print out, but in
general you should be able to reset the margins.
Are you using a document created by a specific application? Are you connect
to a PC or a Mac?
Again, I am working at home and I do not have access to the supplement. If
you can not locate it leave me another message.
-Esther Kletter