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Photocopier double image

Discussion in 'Electronic Repair' started by perion_666, Aug 8, 2007.

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  1. perion_666

    perion_666 Guest

    I have a Sharp Z-57 that, about halfway down the paper, begins faintly
    reproducing the first half of the page a second time, as it's producing the
    normal second half. So, you get a normal top half of the sheet but the
    second half contains the normal second half PLUS a faint first half. It's as
    if the circumference of the drum is half the length of the page (5.5 inches)
    and the residual toner isn't being removed from the drum after it's
    transfered to the paper. I'm not sure if this model uses a scraper or what
    to remove the residual toner. Or, could it be the charge that's lingering
    from a previous drum rotation?.

    Does this make any sense?

    Thanks for any insights.
     
  2. N Cook

    N Cook Guest

    Usually there is a residual toner discharging set of LEDs or lamps in a line
    with a glass cover slip that easily gets coated with toner so not
    neutralising the charge so toner not removed by the excess recycling
    voltage.
    some photocopier operation/repair general hints on my page
    http://www.divdev.fsnet.co.uk/copiers.htm
     
  3. Chris Jones

    Chris Jones Guest

    Is it like the Z-50 where you can pull out the drum easily? (on the Z-50
    it's supposed to be user-replaceable)

    You could roll the paper into a tube so that the main image and the ghost
    are overlaid, and then see if the diameter matches the drum or one of the
    other rollers which could be dirty.

    You seem to be onto the right track(s) anyway.

    Chris
     
  4. whit3rd

    whit3rd Guest

    Often there is an electrical contact to the toner drum, and a corona
    wire
    attached to that contact; clean the wire and contact. Various devices
    are used to erase the drum after the paper gets its toner, your
    machine
    obviously isn't doing that erase thoroughly. Old machines always
    used a corona wire (just a thin stainless steel wire, with high
    voltage applied).

    Because the corona wire is subject to various kinds of failure, it's
    part of the toner cartridge; when you swap cartridges, does the second
    image vanish?

    Sometimes a sheet of paper gets wrapped around a roller and dirties up
    the
    print in this way, but I presume you've made visual inspection
    already...
     
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