laser-lovers@uw-beaver (04/13/85)
From: ihnp4!utzoo!henry@uw-beaver.arpa
Here, straight from the HP service manual, is the scoop on how to set
baud rates on your HP LaserJet. We've just moved one of ours up to
19200, for faster typesetting.
1. Remove the font cartridge (if any). [Damned if I know why.]
2. Turn the power off. Unplug the power cord.
3. Look at the rear panel, comprising most of the side of the printer
above the manual feed slot. It is held on by four Philips
screws. Unscrew them. Take the panel off; you'll have to
wiggle it a bit to get it loose.
4. Just under the top surface of the printer, you'll see a PC board.
Roughly in the middle, half-hidden behind a small metal bracket,
you will see a set of DIP switches marked SW1.
5. You are interested in switches 2, 3, and 4. Leave the others alone.
The switches are numbered left-to-right, and the numbers should
be visible on the switch body. Set them accordingly (you'll have
to use a pen or something to reach in; switch 4 in particular is
almost behind the aforementioned metal bracket).
switch
2 3 4 rate
off off off 300
off off on 600
off on off 1200
off on on 2400
on off off 4800
on off on 9600 (this should be the way it comes)
on on off 19200
The HP manual does not say what you get from "on on on".
6. Put the rear panel and its screws back.
7. Plug it in. Turn the power back on.
8. Adjust the baud rate your system uses, to match.
The above information is offered as a service to responsible adults.
I take no responsibility for the consequences of its use, be they
electrocution of your hardware man or accidental activation of the
self-destruct system of your LaserJet. Be Careful.
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henry