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  1. #1
    SanDiegoCopierRepair.com 1,000+ Posts
    Canon c5550i  dark copies and dark prints

    blazebusiness's Avatar
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    Canon c5550i dark copies and dark prints

    Copies and prints are clean but blacks and colors are way too dark, so we did a full cleaning and ran Full Gradiation adjust and the copies were fine again. Fast forward 2 months 4 days later and the darker prints and copies returned again. Full Gradiation adjust resolved issue but not sure why the dark prints return after being stable for 2 months. Not sure what to replace to solve this issue. Any ideas what parts might cause this? Drums and all other parts are well within their life still. Nothing overdue for replacement.
    Anything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com

  2. #2
    Service Manager 10,000+ Posts
    Canon c5550i  dark copies and dark prints

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    Re: Canon c5550i dark copies and dark prints

    Quote Originally Posted by blazebusiness View Post
    Copies and prints are clean but blacks and colors are way too dark, so we did a full cleaning and ran Full Gradiation adjust and the copies were fine again. Fast forward 2 months 4 days later and the darker prints and copies returned again. Full Gradiation adjust resolved issue but not sure why the dark prints return after being stable for 2 months. Not sure what to replace to solve this issue. Any ideas what parts might cause this? Drums and all other parts are well within their life still. Nothing overdue for replacement.
    Toners aftermarket?

    Sent from my SM-G960U using Tapatalk

  3. #3
    SanDiegoCopierRepair.com 1,000+ Posts
    Canon c5550i  dark copies and dark prints

    blazebusiness's Avatar
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    Re: Canon c5550i dark copies and dark prints

    Quote Originally Posted by Phil B. View Post
    Toners aftermarket?

    Sent from my SM-G960U using Tapatalk
    Nope, only using oem. This customer runs a very successful chain of BBQ restaurants and is not afraid to spend $$$ for proper maintenance,oem parts and supplies, and never cuts corners by using the aftermarket crap.

    This has happened a few times now.

    Symptom is always the same:

    At AROUND THE 2 MONTH MARK COPY QUALITY DARKENS AND THEN CAN BE RESOLVED BY RUNNING A FULL GRADIATION ADJUSTMENT.


    Thanks for responding though, appreciate it.
    Last edited by blazebusiness; 09-14-2021 at 07:32 PM.
    Anything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com

  4. #4
    teacher-guide-expert-guru 2,500+ Posts
    Canon c5550i  dark copies and dark prints

    zoraldinho's Avatar
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    Re: Canon c5550i dark copies and dark prints

    Probably the customer has the same model of the printer somewhere close. With a usb key make export-import from a working device. This will also restore the service mode settings. Update the latest firmware and clean the patch sensors.Nothing else comes to my mind.
    Practice makes perfect
    If it ain't broke, don't fix it
    A picture is worth a thousand words
    If you want something done right, you have to do it yourself


  5. #5
    SanDiegoCopierRepair.com 1,000+ Posts
    Canon c5550i  dark copies and dark prints

    blazebusiness's Avatar
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    Re: Canon c5550i dark copies and dark prints

    Quote Originally Posted by zoraldinho View Post
    Probably the customer has the same model of the printer somewhere close. With a usb key make export-import from a working device. This will also restore the service mode settings. Update the latest firmware and clean the patch sensors.Nothing else comes to my mind.
    Those patch sensors were the first thing I thought of also. They are clean. And the gradiation adjustments run correctly and do not fail. So I do not suspect an issue with those sensors. Thank you for the reply.
    Anything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com

  6. #6
    Senior Tech 100+ Posts onlyinnewfoundland's Avatar
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    Re: Canon c5550i dark copies and dark prints

    Quote Originally Posted by blazebusiness View Post
    Copies and prints are clean but blacks and colors are way too dark, so we did a full cleaning and ran Full Gradiation adjust and the copies were fine again. Fast forward 2 months 4 days later and the darker prints and copies returned again. Full Gradiation adjust resolved issue but not sure why the dark prints return after being stable for 2 months. Not sure what to replace to solve this issue. Any ideas what parts might cause this? Drums and all other parts are well within their life still. Nothing overdue for replacement.
    Maybe do full init of machine?

  7. #7
    SanDiegoCopierRepair.com 1,000+ Posts
    Canon c5550i  dark copies and dark prints

    blazebusiness's Avatar
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    Re: Canon c5550i dark copies and dark prints

    Quote Originally Posted by onlyinnewfoundland View Post
    Maybe do full init of machine?
    Things like that - only as a last resort when all else fails to help.
    Anything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com

  8. #8
    Engineer senior 100+ Posts giogi's Avatar
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    Re: Canon c5550i dark copies and dark prints

    maybe

    ADJUSTMENT/MAINTENANCE
    ADJUST IMAGE QUALITY
    CORRECT SHADING
    VISUAL CORRECTION
    RESTORE INITIAL SETTINGS
    STORE & FINISH
    "Knowledge is a source, but unfortunately ignorance is a sea."

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