Dude, all this talk inspired me to shove a pcb thru the 4019 ... It works.
err - well mostly
I don't think it matters if it shorts to ground, The whole corona wire
assembly is metal. I believe the static charge is so influential that it can
overcome any grounding, It only makes the toner come off the drum. any
substrate, Paper, copper, aluminum, or otherwise, If it's between the drum,
and the discharge corona - it's getting toner'd
My problem is specifically with a sensor in the 4019, it detects paper size,
and it didn't like the fact that the pcb was 4X6 and it was expecting a
8.5X11 so it thru a paper size error, with the pcb 1/2 sticking out the
printer, and 1/2 in the fuser. The image was clear and fused. But I could
rub it off If it tried excessively hard.
The printer still prints on paper , with now a small repeating black mark -
I think I created trying to force the pcb in in my initial fail attempts
(before I figured out how to use the manual feed option) The 4019 is unique
in it's straight thru manual feed. Too bad it's only 300dpi.
I then tried to stick the pcb thru attached to a piece of paper, but I had
taped the leading edge with 3m blue masking tape, and this turned out to be
too slippery for the roller to pull it in (with the extra umpf needed to
pull the excessively thick substrate under the drum, which flexes (sp?) a
bit. That's where I stopped tonight. Tomorrow I'll try again, and get the
digicam out. to at try to p r o v e it for the nay sayers.
JT
---
http://www.soundclick.com/jtsound ----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, February 25, 2004 3:40 AM
Subject: Re: [Homebrew_PCBs] Laser printer - experts please explain
>
> > No. The paper "charges" in the laser-printer just like your PLASTIC
> > (non-conductive) comb charges on a very dry day when you comb your
> > hair. The copper
> > is obviously a GOOD conductor, a dead-short to ground, so NO "charge"
> > will
> > build up, which would attract the toner-powder.
> >
>
> Well then, i thought the same.
>
> BUT why then works Aluminium foil?
>
>
> What i wanted to do is isolate the PCB so there is no short to ground.
> i want to put it on a carriage, of teflon or such, which has the
> appropriate
> HV source connected to it. To charge the whole board.
> The copper conducts, correct, but it can still hold a charge.
>
>
> I wonder how bad/good a printer will work if the first corona wire is
> completely
> off.
> I looked further and the aluminium foil has to short it out, it just has
> to, there
> is a grounded area just in front of this wire where it passes between a
> metal roller and
> bar.
>
>
> I will try to unplug the corona wire somehow, and see what happens, but
> this HV wiring is pretty
> well covered....
>
> ST
>
>
>
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