Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

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  • Allie Hussein
    Technician
    • Feb 2020
    • 10
    #1

    [Misc] Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

    Good Night Guys,

    I have have been having issues with the C5100 and also with the C7100 quality for some time now.
    The entire backgrounds would be covered with Fine Speckles that are Grainy and Dirty. This is more visible in the white areas.
    When we change the Charge Rollers and Drums, this would clear up for short periods and go right back to the same issue.
    I have examined this on several jobs and notice that the speckles varies from job to job. For instance, if I look under the magnifying glass, I may see lots of Magenta and Cyan Speckles. On another job, I may see just Magenta Speckles. On the jobs shown in the attachment, there is only Cyan, Yellow and Speckles (no Magenta).
    Someone mentioned that it's called Toner Blast and another said Overtoning.
    Does anyone have an answer to this? None of the consumable have reached their targets. Is there a setting in the SP Mode?
    Attached Files
    Tags: c5100, dirty background, ricoh toner speckles, staining, toner blast
    • slimslob
      Retired

      Site Contributor
      25,000+ Posts
      • May 2013
      • 36734
      #2
      Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

      Are you using Genuine Ricoh toner, developer and drums? How close are the PM counters to the recommended counts? Are the ambient temperatures at the locations within the specified ranges?

        Comment

        • TonerMunkeh
          Professional Moron

          2,500+ Posts
          • Apr 2008
          • 3869
          #3
          Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

          ITB bias rollers are always a good cause of this.
          It's 106 miles to Chicago. We've got a full tank of gas, half a pack of cigarettes, it's dark and we're wearing sunglasses.

          Hit it.

            Comment

            • Allie Hussein
              Technician
              • Feb 2020
              • 10
              #4

                Comment

                • slimslob
                  Retired

                  Site Contributor
                  25,000+ Posts
                  • May 2013
                  • 36734
                  #5
                  Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

                  I think I see where your problem might be. Changing Fixed Supply Mode should not have any effect unless all SP 3400 Toner Supply Type are not set properly. They all should be set to 4 for process control to be able to properly maintain image quality. When set to 0 for Fixed the machine will slowly overtone. The only time that fixed supply mode should be used is while waiting for parts such as a new ID sensor or a toner density sensor.

                    Comment

                    • bojans
                      Service Manager

                      Site Contributor
                      1,000+ Posts
                      • Feb 2008
                      • 1313
                      #6
                      Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

                      I remember when first 7100 arrived at my area, customers experienced the same problem after only 200K copies. That machine wasn't under contract with my company, so I didn't servicing that machine.
                      Other company first got RTB from Ricoh explaining some procedures, something with lowering drum potential and density, but that caused bad quality and wasn't best solution.
                      After couple months thay upgraded firmware and problem was gone. I thing it had something with drum cleaning assy which wasn't removing used toner and it was building in the cleaning unit and sparkling on the drum. Firmware solved problem with used toner.

                      As i said, didn't have this problem, just overheard from other source.

                        Comment

                        • slimslob
                          Retired

                          Site Contributor
                          25,000+ Posts
                          • May 2013
                          • 36734
                          #7
                          Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

                          Originally posted by bojans
                          I remember when first 7100 arrived at my area, customers experienced the same problem after only 200K copies. That machine wasn't under contract with my company, so I didn't servicing that machine.
                          Other company first got RTB from Ricoh explaining some procedures, something with lowering drum potential and density, but that caused bad quality and wasn't best solution.
                          After couple months thay upgraded firmware and problem was gone. I thing it had something with drum cleaning assy which wasn't removing used toner and it was building in the cleaning unit and sparkling on the drum. Firmware solved problem with used toner.

                          As i said, didn't have this problem, just overheard from other source.
                          It is possible to slightly lower the toner concentration in the development unit and offset the decreased image density by slightly increasing the amount transferred off the drum to the ITB.

                            Comment

                            • Warnock
                              Technician

                              50+ Posts
                              • Dec 2006
                              • 50
                              #8
                              Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

                              Originally posted by bojans
                              I remember when first 7100 arrived at my area, customers experienced the same problem after only 200K copies. That machine wasn't under contract with my company, so I didn't servicing that machine.
                              Other company first got RTB from Ricoh explaining some procedures, something with lowering drum potential and density, but that caused bad quality and wasn't best solution.
                              After couple months thay upgraded firmware and problem was gone. I thing it had something with drum cleaning assy which wasn't removing used toner and it was building in the cleaning unit and sparkling on the drum. Firmware solved problem with used toner.

                              As i said, didn't have this problem, just overheard from other source.
                              Yes, this is very familiar. There was a premature speckling that was connected to the cleaning units. spot on.
                              Programmers don't die, they gosub without return...

                                Comment

                                • Allie Hussein
                                  Technician
                                  • Feb 2020
                                  • 10
                                  #9
                                  Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

                                  Originally posted by slimslob
                                  It is possible to slightly lower the toner concentration in the development unit and offset the decreased image density by slightly increasing the amount transferred off the drum to the ITB.

                                    Comment

                                    • slimslob
                                      Retired

                                      Site Contributor
                                      25,000+ Posts
                                      • May 2013
                                      • 36734
                                      #10
                                      Re: Ricoh C5100 and C7100 with Speckles / Grainy / Dirty background

                                      The first step is to replace everything in the PM specs for the drum units, development units, ITB cleaning unit and PTR unit, removing all scattered toner as you go. Next you need to return all SP setting to their birth certificate values or in the case of certain parts that when replaced have SP values that need to be set for them, use the values that were on the sticker that came with the new part.

                                      You can then apply the settings in the attached document. Bear in mind, the document was written for older machines and since then Ricoh has changed the actual SP numbers to use. The document merely provides guidance as to what needs to be change by description and not by SP number. Service Program (SP) Settings.pdf

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