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Service Manual for Epson scanner?

Discussion in 'Electrical Engineering' started by Sparky, Feb 4, 2010.

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  1. Sparky

    Sparky Guest

    Looking for the service manual for an Epson Perfection 1640SU scanner.

    I've found few for sale.

    Anyone have this file that want to share it? Or know of a free download

    And yes, I've Googled.

    sparkyguy442trashATyahooDOTcom (take out the "trash" before mailing me.)
  2. Sparky

    Sparky Guest

    And no, eserviceinfo doesn't have it.
  3. Dean Hoffman

    Dean Hoffman Guest

    It isn't here somewhere?
  4. James Sweet

    James Sweet Guest

    What's wrong with the scanner? I've fixed a whole lot of stuff over the
    last 20 years or so and had a service manual maybe 0.5% of the time. It
    helps, but most faults can be found without one. Even service manuals
    for a lot of things don't go down to the actual component level. 90% of
    the faults I see are either bad electrolytic capacitors or cracked
    solder joints.
  5. Sparky

    Sparky Guest

    What's wrong with the scanner? I've fixed a whole lot of stuff over the
    It's not troubleshooting I need the manual for. I think I know what the cause
    is. (I posted the question re. this scanner elsewhere in this group earlier.
    It's copied below.)

    If the diagnosis is right (so says the Epson tech) I want to replace the flat
    bed glass. And there's some kind of calibration afterward. At least that's
    what I want to find out in the manual.


    - - -

    Epson Perfection 1640SU Office scanner with Auto Doc Feeder (ADF). The ADF
    plugs into the back of the scanner via a DIN-8 plug. (The ADF is model EU-34,
    pn B813222.)

    The scanner will scan documents on the flat bed glass with no problems.

    When the ADF is used, the paper feeds through the rollers smoothly. No jams
    or other feed problems.

    The resulting scan in ADF mode is all vertical lines. I tried different
    resolutions and other settings. Also tried different applications. Same

    A tech at a local Epson authorized repair facility said that this is a common
    failure. There is a calibration strip at the "home" position on the bottom
    side of the flat bed glass. Over time this white strip changes (it shrinks?)
    and when calibration is done at power-on, incorrect calibration results.

    The Epson tech says that this is a quite common failure mode and he does many
    of these repairs on several different models. (I didn't ask if it was common
    to other than Epson.)

    How does this calibration work such that it succeeds for flat bed scans but
    fails for ADF scans? Can someone explain?

  6. Adrian C

    Adrian C Guest

    Ye would think that. However I found the service manual for my LED based
    Canon N650U scanner (free at incredibly detailed on
    operation theory with 110 pages, for something that contains very few
    parts, and not even a power supply (USB powered).
  7. zpetlic


    Jun 17, 2010
    You should look at the little gap on ADF (9mm), near back end. If there is some dirt or it is scrathed/damaged you'll get vertical lines on the scanned document. I suppose that this part could be replaced, but you'll need th part number (from service manual). I'm also looking for service manual for part number of ADF cable.
    Good luck.
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