Try a clean up inside the Laser Scanner Assy. pay attention to the mirror.
P <
apache2000_nl@...> wrote: I was already afraid that a hardware solution would be missing.....
Is someone here using a Laserjet 4 to do his artwork? I'm using
a 'white label' toner so I have ordered an original one from HP.
Maybe that will do the trick.
I tried putting two sheets on eachother but that didn't work out fine
either...... I have a professional vacuum exposure unit.
I have had good results with tracing paper. I don't understand what
happened / happens....
Pieter
--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@...> wrote:
>
> Download the manual and see if such a pot exists.
> The IIID had one (green), and i believe at least one newer model
still had it.
> Later they decided users are just to dumb to find and adjust that
pot,
> and built it into software instead.
>
> ST
>
> On Jan 26, 2008 12:15 PM, P <apache2000_nl@...> wrote:
> > Thanks for your replies.
> >
> > I didn't find any settings in the driver to increase the toner
amount.
> > All the settings on the printermenu and driver are set to the
> > most 'darkest' setting.
> > I know some printers have a hardware (trimpot or switch or
something)
> > to increase the amount of toner...
> >
> > Is there a possibility it can be done on the pcb in the printer?
> >
> > Pieter
> >
> >
> >
> >
> > --- In Homebrew_PCBs@yahoogroups.com, "Leon" <leon355@> wrote:
> > >
> > > ----- Original Message -----
> >
> > > From: "P" <apache2000_nl@>
> > > To: <Homebrew_PCBs@yahoogroups.com>
> > > Sent: Friday, January 25, 2008 4:29 PM
> > > Subject: [Homebrew_PCBs] HP Laserjet 4P darker printout
> > >
> > >
> > > > Hello all,
> > > >
> > > > I have a question : I recently bought a secondhand Laserjet
4P to
> > make
> > > > my own artwork.
> > > > Besides the fact that the printer doesn't print that black
(with
> > a new
> > > > tonerkit) it also prints irregular traces (small bits
missing).
> > > > On my former job we also used a laserjet 4P. Printing always
went
> > great
> > > > on heavy tracing paper).
> > > >
> > > > I have tried several types of transparants. (overhead and
tracing
> > > > paper) but I can't get any good results no mather what I do
in the
> > > > driver menu or printermenu.
> > > >
> > > > Is it possible that I have to clean the printer? Or is there a
> > > > possibility (potentiometer or simular) on the printer to
increase
> > the
> > > > amount of toner?
> > >
> > > Perhaps the printer is faulty, I used to get quite good results
> > with a 4P.
> > > Ink jets are ∗much∗ better, if the correct medium is used.
> > >
> > > Leon
> > >
> >
> >
> >
> >
> > Be sure to visit the group home and check for new Links, Files,
and Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBs
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
---------------------------------
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