Homebrew PCBs

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? 

Thanks in advance for your time,

Pieter

On Fri, 25 Jan 2008 15:29:43 -0000, you wrote:

>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).

Check all the replaceable bits and pieces and see if they're clean. On
most HP printers, the drum and toner are one unit, so you should have
gotten a good one.  However, if there's a regular pattern to the
missing pieces, you either have a bad fuser (the pattern will rub
off), or the drum might be bad.  A call to HP support if possible
might help that.
>
>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.
>

If  you are getting good results on paper, then one problem is that
the toner density might be too low.  Not sure how to set this on a 4P,
I do know how to do it on a 2200D.

>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? 
>

maybe a utility that HP has installed in the programs folder under HP
in windows.

Harvey

>Thanks in advance for your time,
>
>Pieter

----- 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

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
>

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
>
>
>
>
>

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
> >
> >
> >
> >
> >
>

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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