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Printer mod

Discussion in 'Electronic Basics' started by, May 24, 2007.

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  1. I have built a flatbed printer from an old Epson 640 but need to fool the
    printer into thinking there is paper in, when the drive stepper is disabled
    I have tried timing relays but can't get it right. Does any clever person
    know how I do this. This would be a great project if it were possible.
  2. Don McKenzie

    Don McKenzie Guest

    If it is built from an old printer, then I would assume that it is a
    centronics connector, that is fed from a db-25 connector.

    Simply needs a resistor tied to the PE signal.

    I did a writeup on it years ago that you can refer to:


    Don McKenzie

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    USB Flash Drive interface for existing products.
  3. Somehow I was thinking it's an inkjet, the number just seems of
    that type.

    And hence, or maybe because the question suggested it itself, the issue
    is some interlock that prevents the printer from operating. But perhaps
    what I was thinking of as interlocks are merely sensors to pass a signal
    to the computer via the interface.

    I'd just find the actual switch, and deal with it, in this application.
    Though, the question almost seems to suggest that the problem might
    be a missing switch (because he says he modified the printer, but
    now it's not working).

  4. Rich Grise

    Rich Grise Guest

    A piece of scotch tape over the switch actuator?

    Good Luck!
  5. I have kept the slotted optos and tried using 555 timers to simulate the
    paper feed it did work a few times but then stopped I don't know if the
    timing is too critical I might try a geared motor with a slotted disk if all
    else fails but was wondering if there was a wiring trick, info on how
    inkjets operate is so hard to find.
    I can fool the paper feed sensor but not the paper detect switch it seems to
    be about 6 to 8 seconds delay.
  6. If only it was that simple, its all about timing.
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