Hi Phil,
I'll include a link for you below to the LaserJet 5L homepage. There are lots
of FAQs, technical documents, etc off of that page. Hopefully the answer
you're looking for will be off one of those links. If not, you can give the
printer support group a call at 208-323-2551. I searched for a forum but they
don't have one for that model.
Best regards,
Jamie Hughes