c454e - streaks where Y toner missing

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  • frood
    Technician

    Site Contributor
    • Sep 2022
    • 17
    #1

    c454e - streaks where Y toner missing

    Hi all,

    I replaced a lot of worn parts on a high milage c454e I own for small business use.

    Due to age and CLEAR physical damage, I have replaced thus far already:
    CMYK Drums
    Image Transfer Belt (dented and scratched badly)

    Quality is vastly improved, and I've verified the corona wires are clean an the Y drum unit scraper looks fine and has not clumps on it.

    Yet, the (missing yellow) lines where yellow toner is either not getting placed or being scraped off before placement persist.


    20231020_190713 (1).jpg

    Any advice appreciated.

    Since I'm generally not printing full color pages, it's rarely an issue. But ... I'd REALLY like to fix it ... lol.
    Last edited by frood; 10-21-2023, 10:24 AM. Reason: Image han't attahed
    Tags: c454e, replaced, streaks, toner, yellow
    • femaster
      Service Manager

      1,000+ Posts
      • May 2011
      • 1492
      #2
      Re: c454e - streaks where Y toner missing

      Going to need samples in order attempt to figure this one out.

      Based on your description, it sounds like this machine was abused pretty badly. Did you acquire it this way, or any idea how it got damaged like it did? It's possible the problem could lie in the development unit for yellow. Have you verified you have a nice even layer on the mag roller for yellow? Perhaps there is something blocking part of the laser glass for the yellow. If machine was jarred, maybe the magnet in the mag roller of the yellow development unit is broken. It's a fairly rare thing to happen, but not unheard of.
      A Ricoh Service Tech for 7 year. A Konica Minolta Service Tech for 7 years. Now, KM service manager for 4 years.
      My Ricoh knowledge is slowly dwindling away at this point. Many things have been lost to time...

        Comment

        • blackcat4866
          Master Of The Obvious

          Site Contributor
          10,000+ Posts
          • Jul 2007
          • 23002
          #3
          Re: c454e - streaks where Y toner missing

          I haven't anything to add to that. =^..^=
          If you'd like a serious answer to your request:
          1) demonstrate that you've read the manual
          2) demonstrate that you made some attempt to fix it.
          3) if you're going to ask about jams include the jam code.
          4) if you're going to ask about an error code include the error code.
          5) You are the person onsite. Only you can make observations.

          blackcat: Master Of The Obvious =^..^=

            Comment

            • frood
              Technician

              Site Contributor
              • Sep 2022
              • 17
              #4
              Re: c454e - streaks where Y toner missing

              Image didn't attach to OP for some reason.

              Abuse - Let's call it neglect. Non-consumable parts are in great shape, it just had all consumable life notifications off. Drums were just run without ever changing as was the transfer belt. Original yellow drum had caked toner chunks all through it so it was first to be replaced, then did others as well after observing they were well past useful life.

              20231020_190713 (2).jpg

                Comment

                • tsbservice
                  Field tech

                  Site Contributor
                  5,000+ Posts
                  • May 2007
                  • 8001
                  #5
                  Re: c454e - streaks where Y toner missing

                  As it was said, take out yellow drum then developer unit and closely observe areas where strikes are against mag roller brush. If coating is even and no missing zones clean thoroughly PH unit (laser). You may need to remove it from machine. While laser is removed it's probably good idea to open it and clean poly motor mirrors, be very careful while doing that.

                  Also don't forget to click on thanks when your problem is solved but even better contribute to this site maintenance and administration
                  A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
                  Blessed are they who can laugh at themselves, for they shall never cease to be amused.

                    Comment

                    • Synthohol
                      Certified Konica Expert

                      Site Contributor
                      5,000+ Posts
                      • Mar 2016
                      • 5814
                      #6
                      Re: c454e - streaks where Y toner missing

                      there are gradation and halftone test patterns to output each color.
                      this will help greatly in diagnosing quality issues.
                      this should be a requirement to post both sets of test prints.
                      otherwise this guessing is like pulling teeth from a clam.

                      these copiers have these test patterns built in to help diagnose issues but almost nobody uses or checks them first.

                      but at first glance the issues seems to be in the DV units if the drums were really replaced with real new units.
                      are they new drums or just the cylinders? new ones have new coronas.

                      could tell better with real test patterns please.
                      We know a thing or two because we've seen a thing or two.
                      The medication helps though...

                        Comment

                        • frood
                          Technician

                          Site Contributor
                          • Sep 2022
                          • 17
                          #7
                          Re: c454e - streaks where Y toner missing

                          FFS. I'd cleaned the laser glass with the flippin' tool three times.

                          Just did it ONE more time and kind of leveraged it "up" to put a little more pressure on the glass (in case it was stuck) and ... lines gone.

                          Thanks all.

                          Here are a few samples. The only thing I think could look better would be the black; it's kind of line-y. But, actual demo print comes out nice.
                          (note on cyan sample; the dark rectangles are from a print underneath, they're not in the test print)

                          If you think there's something obvious I should do, welcome to ideas. But I'm sorted for now for the streaking issue.
                          20231021_181029 (2).jpg
                          20231021_181105 (2).jpg
                          20231021_181036 (2).jpg
                          20231021_181049 (2).jpg (note, dark rectangles are from a print behind, not flaws)
                          20231021_181102 (2).jpg

                            Comment

                            • femaster
                              Service Manager

                              1,000+ Posts
                              • May 2011
                              • 1492
                              #8
                              Re: c454e - streaks where Y toner missing

                              Based on those last samples, my first guess would have been that the black drum was getting weak, or the corona wires and/or grid needed a good cleaning. Since you said you already replaced all the drums, I have to assume that is not the problem then, and it is probably the case that there is still some stuff left on the laser glass of the black. Or perhaps the DR blade in the dev unit has some junk stuck in it and is creating those light streaks on the output.

                              In addition, if you haven't run it already, I'd run gradation adjustments in order to bring things back into alignment since there are so many new parts. It may even look better after doing that.
                              A Ricoh Service Tech for 7 year. A Konica Minolta Service Tech for 7 years. Now, KM service manager for 4 years.
                              My Ricoh knowledge is slowly dwindling away at this point. Many things have been lost to time...

                                Comment

                                • mascan42
                                  Trusted Tech

                                  250+ Posts
                                  • Oct 2008
                                  • 484
                                  #9
                                  Re: c454e - streaks where Y toner missing

                                  I would consider pulling out the print head and examining the glass. I've seen it get scratches that can cause toner buildup to be EXTREMELY difficult to clean.

                                    Comment

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