Homebrew PCBs

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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