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  1. #1
    Field Supervisor 500+ Posts
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    CM4540 yellow background

    I have a CM4540 that got a new fuser drive unit. What a job. After the job, I was printing out test pages, and suddenly, in the middle of it all, they started turning solid yellow in the background. I checked all the connections, and everything seems good. Then I saw on the formatter interconnect board, that a couple of the metal contacts on that ribbon cable were loose and folded out. I tried fixing it, but finally replaced it. Eveything else works now, but, except in colored prints, all yellow background...except the edges. The edge-erase is working fine. All edges are white. I ran an engine test, and those print fine--no yellow background.

    I guess I know the answer to this--the formatter. But I'm hoping someone knows something I don't. I don't feel like going to the customer and telling them they need to spend another $300.


  2. #2
    Service Manager 250+ Posts Phil B.'s Avatar
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    Re: CM4540 yellow background

    yup you said it.. if you did engine test w/o the formatter and test was good.. plugged formatter back in and bad.. replace formatter


  3. #3
    Just a fellow wanderer 2,500+ Posts Iowatech's Avatar
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    Re: CM4540 yellow background

    How does the yellow drum look? If the unwanted yellow shading on the drum happens before the laser window you might try a different yellow unit.


  4. #4
    Field Supervisor 500+ Posts
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    Re: CM4540 yellow background

    no. Drum looks fine. OEM toners. And like I said, the edge erase works.


  5. #5
    Junior Member
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    Re: CM4540 yellow background

    i've got 14 4540's at one site i service, and replaced 5 formatter boards in 3 years. never had the issue OP describes though


  6. #6
    Field Supervisor 500+ Posts
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    Re: CM4540 yellow background

    Just an update on this:

    The cust approved the formatter. I have one coming from China, because there weren't any refurbs available in the US. I'll post results when I do the job.


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