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  1. #1
    Trusted Tech 50+ Posts
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    Weirdest Bizhub C452 print issue I've seen in my 20 years

    Hey all,

    Got a bizhub C452 with about 400,000 prints total. Can only see this issue when printing on 11 x 17 paper. Tried scanning but the light gray part of the issue doesn't show up, so here's my best description

    I created an 11 x 17 text document with lines of text - about 3-4 lines of different colors text -black, blue, red, orange, light blue and green. When I print it out I get this problem - the black, red, light blue, and orange all print fine. The trailing 4" of the blue and green you can see the black "showing as a light gray on print" starts slowing separating out so that by the end it is mis-registered by about 2mm. This happens during only the trailing 3-4" and only in green and blue.
    I've tried the firmware, main PCB, laser unit, laser unit drive board, all imaging unit, black drum, developer unit, transfer belt, and transfer belt drive unit.
    I'm about to change the print board, but just thought I'd throw this up here to see if anyone has ever had this issue????

    Added - print board no fix, same issue is seen on the color registration printout - C, M, and Y all separate out more and more on the last 6 sets of registration marks

    Thanks for any help
    Last edited by Dougtech; 11-27-2017 at 05:55 AM.

  2. #2
    Senior Tech 250+ Posts Zesti's Avatar
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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    I hope you have done skew adjustment and color registration settings before replacing boards. Do consider replacing the fusing unit.

  3. #3
    Field Supervisor 500+ Posts B0265's Avatar
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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    Try replacing the fusing loop sensor.

  4. #4
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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    Quote Originally Posted by Zesti View Post
    I hope you have done skew adjustment and color registration settings before replacing boards. Do consider replacing the fusing unit.
    Hi
    Yes did the color registration, skew, and LD adjustments before and after the boards.

  5. #5
    Service Manager 1,000+ Posts
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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    Quote Originally Posted by Dougtech View Post
    Hi
    Yes did the color registration, skew, and LD adjustments before and after the boards.
    try a new fuser unit.

  6. #6
    Step aside, noob 1,000+ Posts EarthKmTech's Avatar
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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    As already said, the fusing loop sensor will cause this - if the actuator under the fuser has been snapped off by careless paperjam removal (is there any other way?) the fusing motor will run at full speed and end up tugging on long paper and causing the belt to turn too fast, totally screwing up color registration on the final 3/4 of the long sheets.

    This actuator is 30 cents and takes 5 minutes to change. every big office engine from c350 to c754 does the same thing.

  7. #7
    Service Manager 1,000+ Posts
    Weirdest Bizhub C452 print issue I've seen in my 20 years


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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    a 30 cent actuator after

    main PCB, laser unit, laser unit drive board, all imaging unit, black drum, developer unit, transfer belt, printer board and transfer belt drive unit.

    gotta love this job

  8. #8
    Self Employed 1,000+ Posts D_L_P's Avatar
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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    If I'm reading your post correctly, the image is what is going crooked not the paper. Is that right? When the color lines separate, is it intrack or cosstrack?
    Last edited by D_L_P; 11-28-2017 at 07:58 PM.

  9. #9
    Trusted Tech 50+ Posts
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    Re: Weirdest Bizhub C452 print issue I've seen in my 20 years

    Quote Originally Posted by B0265 View Post
    Try replacing the fusing loop sensor.
    I will try this next, already tried a fuser unit. Will let you know - adjusting the TRAILING EDGE REGISTRATION adjustment in service mode does bring it closer but not into full registration.

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