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  1. #1
    Service Manager 100+ Posts
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    Canon C1 4 color dots across page

    Cant figure out these small dots Y-M-C-K left to Right , printing in color
    in that order about 1/8" apart never in the same area but on same line
    repeats on 11x17 same line as if it was on the drum rotation.

    Replaced the Drum and ITB same thing!
    Not Drum or ITB!
    New drum
    New Itb
    Very clean
    inside
    Dev units good
    Laser?

    print blank page and no dots!
    Print B&W Just the Black dot same line
    Print from server color ,same thing 4 dots
    print from Scanner color, same thing 4 dots y-m-c-k

    Print 12X18 and more dots same line and little bigger dot

    Great color just the dots
    HELP!


  2. #2
    teacher-guide-expert-guru 2,500+ Posts
    Canon C1  4 color dots across page

    zoraldinho's Avatar
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    HI Penvy.

    My opinion is primary corona issue.First change corona grid,if no better replace corona assy.


  3. #3
    East Coast Imaging 2,500+ Posts
    Canon C1  4 color dots across page

    SCREWTAPE's Avatar
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    Do they look like this. The dots are created by pit marks on the Drum caused by contamination in the Developer Units. Or a bad drum. But you change the drum right.

    Attached Files Attached Files
    Canon Copier Repair Service. Sales, Parts & Toner. NYC/NJ area. Contact:East Coast Imaging Solutions,LLC

  4. #4
    Service Manager 100+ Posts
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    Yes this is it,
    New drum
    Dev units restarted, cleaned less that 100k
    New ITB
    And did the inst4 for the Dev units

    these dots were exactly the same before the drum change
    Everything was cleaned top to bottom.
    I will inspect the New drum but the dots were there before and that same.


  5. #5
    Service Manager 100+ Posts
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    This drum was brand new.
    And i did find a pit mark
    I did everything by the book.
    You have to turn on the mach to get it started to reset.
    Did what the manual said to reset

    New Carona wire and Grid w/less that 5K

    The contamination from the Dev units?
    there not even 100k and have been cleaned and restarted I mean VERY clean!!!
    good brush and color was great.
    Pitting a brand new drum. or was the Drum defective?


    This C1 is a real POS
    But what great color when it works
    This is where I really need some advice on this drum issue
    And replacement

    What did I do wrong?


  6. #6
    Service Manager 10,000+ Posts
    Canon C1  4 color dots across page

    teckat's Avatar
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    Quote Originally Posted by Penvy View Post
    This drum was brand new.
    And i did find a pit mark
    I did everything by the book.
    You have to turn on the mach to get it started to reset.
    Did what the manual said to reset

    New Carona wire and Grid w/less that 5K

    The contamination from the Dev units?
    there not even 100k and have been cleaned and restarted I mean VERY clean!!!
    good brush and color was great.
    Pitting a brand new drum. or was the Drum defective?


    This C1 is a real POS
    But what great color when it works
    This is where I really need some advice on this drum issue
    And replacement

    What did I do wrong?

    Four Scratch Marks Caused by the Pre-Transfer Corona and Four Dots Caused by a Foreign Object

    The Four Dot Marks reproduced on prints are a result of foreign object in the Developing Assembly, Drum
    Cleaning Assembly and in some cases, the Image Scan Patch Sensor. This foreign object strikes the Drum
    during the development process, damaging the Drum.

    Four Scratch Marks:
    The Four Scratch Marks reproduced on prints are as a result of the rear guide on the Pre-Transfer Corona
    breaking, causing the Pre-Transfer Corona to drop down scratching the Drum.
    The Scratch Marks look
    similar to the Four Dot Markings and can be easily mistaken for the Four Dot issue.


    The Four Dot Marks can be resolved by vacuuming the Developer Assemblies, Cleaning Assemblies and
    opening and cleaning the Image Scan Patch Sensor.
    READ PDF BELOW
    C1-TP09-2.pdf


    **Knowledge is time consuming, exhausting and costly for a trained Tech.**

  7. #7
    Service Manager 100+ Posts
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    All of that was done,
    really cleaned the heck out of the Dev units and everything in the drum and dev areas

    replaced the seals and cleaning blades

    Patch sensors
    Everything
    And theres those friggin dots just like you showed in the PDF
    at the bottom.

    This is really heartbreaking to spend all this money and time just to see this fail from a fresh start by replacing almost everything
    except the copier itself.

    The Dev units dont even have 80K but have been cleaned very carefully and use the right starter and resetting the drum and inst-4 for the dev units
    the prim wire is new and grid cleaned.

    very careful on install.
    but right from the start this pit in the drum first time.

    how can you even repair this when its all new?

    the Dev units are as clean as brand new.

    The image patch sensor and everything top to bottom was vac cleaned spotless soon as you turn on this goes into the auto gradation even befor you can start to set up the new parts.
    what gives here?

    I did everything that tech memo said to do.
    How do you replace a drum then??????

    no foreign objects on a clean mach

    where?
    very frustrated with this


  8. #8
    Service Manager 10,000+ Posts
    Canon C1  4 color dots across page

    teckat's Avatar
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    once the Drum is pitted that is it, no repair


    REPLACE THE GUIDE/ IT IS WARPED
    pre-transfer corona guide is the issue/
    u need to replace the guide / it's the position of the guide when u slide in corona unit/

    the end block hits drum when u push it in


    **Knowledge is time consuming, exhausting and costly for a trained Tech.**

  9. #9
    teacher-guide-expert-guru 2,500+ Posts
    Canon C1  4 color dots across page

    zoraldinho's Avatar
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    Quote Originally Posted by teckat View Post
    once the Drum is pitted that is it, no repair


    REPLACE THE GUIDE/ IT IS WARPED
    pre-transfer corona guide is the issue/
    u need to replace the guide / it's the position of the guide when u slide in corona unit

    the end block hits drum when u push it in
    Nail on the head.95%.


    images1.jpg


  10. #10
    Service Manager 100+ Posts
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    I understand that guide,
    No I am aware of that and its not warped and what it is pushed in very slow and deliberate.
    Top and bottom .
    This is a pit that looks as if it was an arc.
    But just shoot me.
    SHIT


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