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  1. #1
    Trusted Tech 50+ Posts
    Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints


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    Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    doc18721720140617101000 (2).pdf

    We have a 2500ci which is a Kyocera 2551ci.

    The machine had only been out at customer for about a week and it started to print colour bands across the page as in above attachment. Printing in black and white works fine this only happens when you attempt to print in colour.

    We ended up swapping the machine and I have been working on it back at the workshop. Naturally after a firmware upgrade didn't fix I just started swapping parts.

    So far I have changed:

    Transfer Belt
    LSU
    Main Board
    High Voltage Board
    Engine Board
    Engine Connect Board

    These were largely uneducated guesses.

    I have printed out the event log and maintenance report and there seems to be a code C7620 registering. The strange thing is this hasn't actually shown up as the usual Machine Failure C code it just seems to keep logging. It refers to ID sensor timing error: colour registration correction failed. I had initially assumed that this was a symptom rather than the cause of the fault but I'm not so sure anymore.

    Has anyone had anything similar to this even on other TaskAlfa colour devices?

  2. #2
    Field Supervisor 500+ Posts
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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    That is a strange one. I think it is a pinched wire.

  3. #3
    Trusted Tech 50+ Posts blackandwhite's Avatar
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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    Quote Originally Posted by Tonerkiller View Post
    That is a strange one. I think it is a pinched wire.
    i agreed.... try to change developing units one by one with a other running machine....i faced the same problem in TA 300...the yellow developing unit caused the problem for me....after changing all pcb ,transfer unit i came to dev-unit...finally i got...

  4. #4
    Service Tech / IT Rep 100+ Posts JVergin's Avatar
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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    Just curious, did your example jam or did the machine reboot before the paper got to the fuser? I see a fingerprint in one of the color bands. If it's rebooting and logging a C code mid print I'd agree with the previous post. Probably a pinched wire, or someone put a tie wrap on too tight, cut through the casing and now a wire is touching the frame. We recently had a 2550ci brand new not boot up for us if the doc processor was connected. Found a frayed wire that might have touched the frame and caused the scanner board to partially go out.

  5. #5
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    Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints


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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    It was jamming in the fuser because the paper they were using was curling badly with the amount of toner. I haven't actually seen any C codes on screen.

    I will swap out the devs and see if it makes a difference.

    Will have another look at the cables aswell although I didn't notice anything when changing the boards.

    Thanks for input

  6. #6
    certified scrub 500+ Posts
    Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    Quote Originally Posted by autopilot View Post
    It was jamming in the fuser because the paper they were using was curling badly with the amount of toner. I haven't actually seen any C codes on screen.

    I will swap out the devs and see if it makes a difference.

    Will have another look at the cables aswell although I didn't notice anything when changing the boards.

    Thanks for input
    laser doesnt have the "start/stop" instruction. it was suppose to be the thin colour band on top, but it went full page but within the print margin?

    Its color only too??

    what would this fall under, print pcb?
    Idling colour developers are not healthy developers.

  7. #7
    Trusted Tech 50+ Posts Alexkyocera's Avatar
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    Angry Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    Hi Did you find a fix for the color bands, I have the same problem! Help!!

  8. #8
    Master Of The Obvious 10,000+ Posts
    Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    Most likely you've got a broken developer spacer on one of the developing units. When that developer bias arcs to the drum it shorts out the HVT, When the HVT shorts out you lose primary charge briefly. When you lose primary charge briefly you get a bar of each color, all simultaneously at the same time. If it happens on a ledger size page, you'll see all of the (4) bars on one page, exactly the same width, about 3" apart.

    It's tempting to replace only the developing unit, but alas, those arcs to the drum have damaged the same color drum even though you can't see any physical evidence. The spots won't go away without replacing the drum also, so you might as well order the drum at the same time.

    Can you guess what color developing unit was damaged on my machine? =^..^=

    Test Sample.JPG
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

  9. #9
    Trusted Tech 50+ Posts Alexkyocera's Avatar
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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    Thank you so much, I am going to try and interchange the units. If i had to take a guess, id say Yellow developing unit




    Quote Originally Posted by blackcat4866 View Post
    Most likely you've got a broken developer spacer on one of the developing units. When that developer bias arcs to the drum it shorts out the HVT, When the HVT shorts out you lose primary charge briefly. When you lose primary charge briefly you get a bar of each color, all simultaneously at the same time. If it happens on a ledger size page, you'll see all of the (4) bars on one page, exactly the same width, about 3" apart.

    It's tempting to replace only the developing unit, but alas, those arcs to the drum have damaged the same color drum even though you can't see any physical evidence. The spots won't go away without replacing the drum also, so you might as well order the drum at the same time.

    Can you guess what color developing unit was damaged on my machine? =^..^=

    Test Sample.JPG

  10. #10
    Master Of The Obvious 10,000+ Posts
    Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

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    Re: Kyocera 2551ci / Utax 2500ci - Full Colour Bars on Prints

    Bingo. =^..^=
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

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