Laserjet II "printer opwn" error

Archived from groups: comp.periphs.printers (More info?)

I haven't remembered part numbers in a while, but you're sure this
isn't a IIp or IIIp? Reason I ask, is the 12 Printer Open is a common
failure to that printer.

Raymond

Archived from groups: comp.periphs.printers (More info?)

John Knowles wrote:
> We have a Laserjet II which we would like to maintain.
>
> Whwen turned on with no PC connected the lights come on on the front panel
> and the display says the printer is doing a self check. After a few seconds
> the lights go out and the display reads "12 printer open". At no time can
> the fans or motors be heard. I tried opening the top, depressing the
> microswitch which is normally activated by the longish plastic tab on the
> cover, and powering on. I do not see a fuser lamp glow when I do this.


From www.fixyourownprinter.com

Error 12 Printer Open no EP cartridge

* Check that the toner cartridge is installed.
* Check that the top cover is firmly closed.
* On HP II/IID/III/IIID printers this error is usually caused by a
bad DC power supply.
* On HP IIP/IIP+/IIIP printers the primary cause is the density
adjusting PCA. There is a slight possibility of it being a bad fan.
There is also a slight possibility of the tab on the fuser access door
above the MP tray breaking off and causing the error. If the fan starts
to run, quits and you notice a burning odor, the scanner motor has
failed and needs to be replaced. The problem can also be caused by a
defective drum shutter on the toner cartridge.
* On the 4/4M/4+/4M+ the tab on the top cover that actuates the
door interlock could be broken.

You say you have no +25 volt DC?

Google is your friend

Search terms "laserjet error 12 printer open"

Lots of hits.

Good luck

Archived from groups: comp.periphs.printers (More info?)

It's a II and not a IIP and now has a functioning 24V supply. I removed the
PC board and found a crack in the board caused, I think, by rough handling.
There were several broken traces which I repaired. All I need now is a new
separator pad!

Thanks for reponding

"John Knowles" <john.knowles@sympatico.ca> wrote in message
news:Wwdie.1720$dS3.433203@news20.bellglobal.com...
> We have a Laserjet II which we would like to maintain.
>
> Whwen turned on with no PC connected the lights come on on the front panel
> and the display says the printer is doing a self check. After a few
seconds
> the lights go out and the display reads "12 printer open". At no time can
> the fans or motors be heard. I tried opening the top, depressing the
> microswitch which is normally activated by the longish plastic tab on the
> cover, and powering on. I do not see a fuser lamp glow when I do this.
>
> I took the DC Power supply (RGI-1394 (02)) apart and checked the
> microswitch-OK.
>
> I do not have +24V between pins 1 and 14 on J212.
>
> I do have 169V on the large electrolytic capacitor which must mean there
is
> rectified mains voltage ready for use by the switchmode circuit.
>
> This is as far as I wanted to go without a circuit diagram.
>
> Can anyone suggest where I might find a service manual with schematics or
> just a DC power supply schematic?
>
> John Knowles
> Montreal
>
>

Archived from groups: comp.periphs.printers (More info?)

John,
Why do you need a separation pad? I've never had any problems with those.
It's usually the paper feed roller that dries out. I can send you a
separation pad for free if you want.
Ken

"John Knowles" <john.knowles@sympatico.ca> wrote in message
news 75je.8955$dS3.929024@news20.bellglobal.com...
> It's a II and not a IIP and now has a functioning 24V supply. I removed
the
> PC board and found a crack in the board caused, I think, by rough
handling.
> There were several broken traces which I repaired. All I need now is a new
> separator pad!
>
> Thanks for reponding
>
> "John Knowles" <john.knowles@sympatico.ca> wrote in message
> news:Wwdie.1720$dS3.433203@news20.bellglobal.com...
> > We have a Laserjet II which we would like to maintain.
> >
> > Whwen turned on with no PC connected the lights come on on the front
panel
> > and the display says the printer is doing a self check. After a few
> seconds
> > the lights go out and the display reads "12 printer open". At no time
can
> > the fans or motors be heard. I tried opening the top, depressing the
> > microswitch which is normally activated by the longish plastic tab on
the
> > cover, and powering on. I do not see a fuser lamp glow when I do this.
> >
> > I took the DC Power supply (RGI-1394 (02)) apart and checked the
> > microswitch-OK.
> >
> > I do not have +24V between pins 1 and 14 on J212.
> >
> > I do have 169V on the large electrolytic capacitor which must mean there
> is
> > rectified mains voltage ready for use by the switchmode circuit.
> >
> > This is as far as I wanted to go without a circuit diagram.
> >
> > Can anyone suggest where I might find a service manual with schematics
or
> > just a DC power supply schematic?
> >
> > John Knowles
> > Montreal
> >
> >
>
>