Question about Canon PC-940 Black and White Copier

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PC940 dark lines across the middle of the page

I have a black streak about an inch or so across every page I copy. Tried a new cartridge. Can I assume there's something somewhere that I havent cleaned? Any clues would be appreicated, especially since the nearest service center is a 5 hour round trip drive from here.

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  • mrdrip Mar 02, 2008

    I finally got around to working on the machine.



    I stopped the machine midway making a copy. The line is on the copy half.



    I assume it's the optics? How do I go about repairing that problem?



    thanks,

    Darrell

  • mrdrip Mar 09, 2008

    Is that the same as the toner cartridge? If it is, I replaced the generic with a canon cartridge a few months ago. Problem never changed.

  • Tannertat Sep 20, 2008

    Have a 3" wide smudge line down the middle [lengthwise] of all copies using auto contrast. If I use the manual contrast I can remove the smudge but the text is significantly lighter. Have worked with better copiers and this problem can be resolved normally be adjusting the auto contrast. This machine doesn't have this function - unless it's in the service manual [which I don't have].

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  • 168 Answers

Either the Fuser/Heating unit is bad, or the optics are dirty.
What you can try to do to narrow it down, is to make a copy but.. STOP the machine in mid process by turning the power off. This will create a paper jam in the machine. If timed properly, your copy should be 1/2 way through the machine with some image on it. (Make sure that you are trying to copy something on the glass). The copy is not FUSED, so the toner will wipe off so be careful not to rub the page against your clothes/sleeve. IF the black line is on the page at this point, the problem is not in the fuser but probably in the fiber optics. If the problem is in the optics and will need to be cleaned. If the black line is NOT on the page at this point, then the fuser unit is bad and needs to be replaced.
Let me know how the copy comes out when you stop the machine in midway and I can see if i can give you any more suggestions.
Good luck.
Mac

Posted on Feb 13, 2008

  • Mac Gyver Mar 04, 2008

    It still could be the image cartridge. This is usually a common problem when you start having copy quality problems.

    How old is the image cartridge?

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