Resolved Issue With MPC5501 Black Marks

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  • engineers
    Technician

    50+ Posts
    • Feb 2008
    • 51
    #1

    Resolved Issue With MPC5501 Black Marks

    IMG_20141030_154544.jpg

    As in image, black marks in centre of page roughly 4cm apart reoccurring sometimes darker than others.
    First thought was dev unit, luckily had another machine so could swap everything over, dev/pcu/itb/ptr/fuser just tried all units as they were there, no change.
    Then went for dev clutch, no change. The marks are on the ITB so must be on the pcu, so looked at the connectors and checked grounding etc.

    Anyway left it until last, engine clear and sorted.

    Just in case anyone runs into the same thing
    Tags: None
    • SargeNZ
      Trusted Tech

      250+ Posts
      • May 2012
      • 263
      #2
      Re: Resolved Issue With MPC5501 Black Marks

      Was this on copies or prints or what? An engine clear is kinda drastic....

        Comment

        • slimslob
          Retired

          Site Contributor
          25,000+ Posts
          • May 2013
          • 37289
          #3
          Re: Resolved Issue With MPC5501 Black Marks

          Originally posted by engineers
          [ATTACH=CONFIG]26966[/ATTACH]

          As in image, black marks in centre of page roughly 4cm apart reoccurring sometimes darker than others.
          First thought was dev unit, luckily had another machine so could swap everything over, dev/pcu/itb/ptr/fuser just tried all units as they were there, no change.
          Then went for dev clutch, no change. The marks are on the ITB so must be on the pcu, so looked at the connectors and checked grounding etc.

          Anyway left it until last, engine clear and sorted.

          Just in case anyone runs into the same thing

          Next time please provide some indication as to the direction of paper travel.


          Originally posted by SargeNZ
          Was this on copies or prints or what? An engine clear is kinda drastic....
          The sample in the picture is a system SP mode test pattern.

            Comment

            • engineers
              Technician

              50+ Posts
              • Feb 2008
              • 51
              #4
              Re: Resolved Issue With MPC5501 Black Marks

              That copy was done through copy screen in SP mode, just a blank copy off the glass. LEF.
              Was both prints and copies, was worse if doing a counter straight after a sky shot.
              It is resolved and working fine, put values back in from birth certificate etc.

              You are right with a memory clear being drastic, it was either that or boards to try next. I didn't have any boards to spare so went that direction.
              Usually if done correctly I don't run into any adverse effects, but I do leave it to one of my last options.

                Comment

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