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Ink jet colour imbalance problem

Discussion in 'Electronic Repair' started by N_Cook, Sep 12, 2012.

  1. N_Cook

    N_Cook Guest

    More out of interest what went wrong than necessity as only used for poster
    use. Epson Stylus 915, if relevant.
    Lack of Red and excess of Yellow
    A perfectly adequate get-around is +30 percent of Red and 30 percent less
    each of Green and Blue in the graphics package. It all started with a postal
    packing foam "doughnut" dropping unnoticed into
    the paper entry slot and numerous paper jams before finding the culprit. The
    ink-jet cartridges are re-set , re-used/ redilled multiple times and
    refilled and reset since this foam business. Built-in "cleaning" and the
    other maintainence routine has made no difference. The colour imbalance is
    stable and invariant over perhaps 30 sheets and 4 separated sessions.
     
  2. N_Cook

    N_Cook Guest


    Is that part of the printer hardware? like the auto-exposure photodiode
    inside a photocopier? ie not in the ink-jet carts.
    Time to explore the innards of one of those junkers in the mule-park, I
    think, to get the hang of ink-jet general operation.
     
  3. N_Cook

    N_Cook Guest

    says Epson Stylus Photo 915 on the front
     
  4. N_Cook

    N_Cook Guest

    I worked out how to get to the active jet face.
    remove both carts and unclip their top clamps
    Remove the ribbon shield, hidden plastic tang and nib at the rear
    Undo the 2 obvious screws
    lift the subassembly away from the carrier, slight joggling required
    no obvious opto device underneath

    Cleaned the active face with alcohol and replaced , but no change in colour
    balance
    At least I've not made it worse (if it ain't broke, don't poke)
     
  5. N_Cook

    N_Cook Guest

    Perhaps its an unintended consequence of doing resets, something stored
    erroneously somewhere
     
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