c6501 a (not straight) line, lead to trail, only in grayscale (not in full black)

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  • GeorgeK
    Technician
    • Sep 2008
    • 23
    #1

    [CQ] c6501 a (not straight) line, lead to trail, only in grayscale (not in full black)

    Appreciate your help in a strange CQ problem.
    Only in light grey or dark grey prints I have a lead to trail, centered, not straight line (as per attached files).
    - Solid black is ok.
    - Problem is NOT from fuser (checked image with panic stop and problem appears before entering fuser).
    - Not from drum or corona (both replaced).
    - Developing assy also ok (no dirt or sth strange)
    - Laser cleaned
    - Ferrite cores inserted in all cables (power/ethernet) for electrical noise.

    Any suggestions would be much appreciated.
    Thanks in advance for your attention.
    Attached Files
    TECHNICIAN noon. (tek~nish~uh n)
    A person who fixes the mistakes made by engineers.
    Tags: greyscale, line on page, quality problem
    • Synthohol
      Certified Konica Expert

      Site Contributor
      5,000+ Posts
      • Mar 2016
      • 5740
      #2
      Re: c6501 a (not straight) line, lead to trail, only in grayscale (not in full black)

      maybe check the transfer belt and roller under the belt.
      the smallest fuzz on the mylar in the laser path right before the drum can do that too.
      just to eliminate the DV unit, tape the holes and swap it with magenta DV unit. leave the toner door open so it wont make a mess trying to add toner while testing. see if issue follows the DV unit.
      We know a thing or two because we've seen a thing or two.
      The medication helps though...

        Comment

        • DigiMan
          Trusted Tech

          Site Contributor
          250+ Posts
          • Jan 2013
          • 262
          #3
          Re: c6501 a (not straight) line, lead to trail, only in grayscale (not in full black)

          You can panic stop it to see if this occurs on 1st or 2nd transfer just below the belt.
          Synth is right about the belt,disassemble it and inspect/clean the associated rollers.
          I presume printing an 125K on 53 test pattern you get same results?
          I don't like the new copier I just bought. It says "put face down" but every time I do it, it blinds my eyes.

            Comment

            • Mick01
              Trusted Tech

              250+ Posts
              • Nov 2012
              • 362
              #4
              Re: c6501 a (not straight) line, lead to trail, only in grayscale (not in full black)

              Looks to me like a fine hair in the laser path. This will move with the fans whilst operating giving you the vavy line.
              Does it only occur in black?
              As mentioned, panic stop and look at the image both on the drum and transfer belt. Doing this should isolate where in the process the issue occurs.

                Comment

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