asked Sep 5, 2000 at 5:48am
Unknown Printer

12 Printer Open Error

Re HP LaserJet Series II... Looking to make my
hanger queen operational for my son. Machine was
inherited and I do not know prior history. I can
my main machine as source of parts to test
non-working printer. Did not find these symtoms
in your FAQ list.

When non-working printer
is turned on, machine goes thru warm up cycle,
and some motor whurls for short period, then
I get Printer Open message even though
case is firmly closed. If my recollection is
correct, at one time I did get it to print a test
page, but it never printed anything from computer.

Today, I turned on unit without a paper tray
installed. Machine alternatively flashed, paper out
and machine open. When I installed tray, machine
said "ready," then soon after said "machine open"
and then started odd off-on cycling like power
supply was failing. Liquid Crystal display seemed
to loose contrast.

I think I may have answered my own question. Looks like bad dc power supply.
by unknown on Sep 5, 2000 at 5:52am Add comment
Yes, you did answer your own question. The symptoms and diagnosis are clearly covered on our troubleshooting page.
by moe on Sep 5, 2000 at 8:01am Add comment
When I called local repair shop to inquire about cost of replacement power supply, they asked about symtoms. Their opinion was that the problem is the "printing density circuit board." I think they're wrong. Comments.
by unknown on Sep 7, 2000 at 8:12am Add comment
In your post you say it's a laserjet II. I have to believe that's the case since you pulled the paper tray out. It's a bad dc power supply. If it were a IIP, then I'd go with the density board. All this info is on our troubleshooting page. Never take anyone else's word on printer repair. You'll always get a correct diagnosis here. If you need a dc power supply with an instructional video, just ask. That's our name; fixyourown printer.
by moe on Sep 7, 2000 at 9:29pm Add comment
I received the following Printer Status Message:"12 Open or no EP-L" This on trying to print something first thing in the morning. The cartridge was fine, there was no jammed paper, ans I checked the cooling fan. It worked fine with an independent power supply. I coould not determine if it worked after re-assembing, but suspect that it did not rfeceive any power. Teh local dealer extorts $80 just to look at this old work horse.
Any suggestions welcome, particularly of a disgnostic nature.
by Michael B on Sep 24, 2001 at 7:53pm Add comment
It seems to me that your problem is covered in the prior discussion.
by moe on Sep 25, 2001 at 9:29am Add comment