Can you put up details of your mod on the Yahoo site? Could you elaborate
on " removing the drum...", etc.?
Thanks
_____
From:
Homebrew_PCBs@yahoogroups.com [mailto:
Homebrew_PCBs@yahoogroups.com]
On Behalf Of sentientnz
Sent: Friday, September 17, 2010 3:07 PM
To:
Homebrew_PCBs@yahoogroups.comSubject: [Homebrew_PCBs] Direct Laser Printing on the cheap
I saw the thread concerning the mod of the Lexmark E260 and was inspired to
have a go.
Not wanting to waste any money, I dug around in the junk cupboard and found
an old Laserjet 2200DN. Seemed as good as any as it has an almost
straight-through paper path.
A few simple mods and 2 hours later and the unit can print direct to PCB -
no electrical mods. In fact, it was simply a case of reducing the pressure
on the registration rollers and the transfer roll for the added thickness of
the PCB (I only had 1/16" single-sided board floating around).
Because the LJ2200 triggers imaging from the registration sensor, and the
registration roller is before the sensor, once the board starts feeding
through the registration roll the imaging is identical every time. I
couldn't be bothered bypassing the fuser/thermistor but the LJ2200 has a
transport assembly between the drum and fuser of about 6" so the PCB simple
sits in this gap after imaging - I remove the drum, list out the PCB, and
reinstall the drum.
I have printed some test patterns, down to 3mil traces with 3mil spacing.
Under a magnifying glass the traces appear uniform and even. I haven't
bothered to try fusing the traces or etching at this width only because I
don't need to go that small... 10mil is small enough for what I do, and that
etches just fine.
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