Konica Minolta bizhub C258 image quality problem

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  • Ihar
    Technician
    • Nov 2020
    • 17
    #1

    Konica Minolta bizhub C258 image quality problem

    I have Konica Minolta bizhub C258 with image quality problem (some colored stripes on the fill) - see on foto.
    Total pages printing count is 229k.

    what do you think - what is the problem of image quality?
    How can i see the drum units count?
    Attached Files
    Tags: count, image, konica, quality
    • Bix
      Service Manager

      1,000+ Posts
      • Apr 2018
      • 1421
      #2
      Re: Konica Minolta bizhub C258 image quality problem

      With that counter, at least once you should have changed all the drums. It really depends on if you have printed a lot of color.
      The signs do not seem continuous, it could also be the transfer belt.

        Comment

        • tsbservice
          Field tech

          Site Contributor
          5,000+ Posts
          • May 2007
          • 7635
          #3
          Re: Konica Minolta bizhub C258 image quality problem

          If you have manual go and read there about Fusing Transport Speed setting adjustment then you can experiment a bit with changing the settings.
          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

            • blackcat4866
              Master Of The Obvious

              Site Contributor
              10,000+ Posts
              • Jul 2007
              • 22699
              #4
              Re: Konica Minolta bizhub C258 image quality problem

              +1 on the primary transfer belt. I saw a similar anomaly on a bizhub 808 ... light gem-like quadrilateral shapes ... no discernible repetitive pattern, and on this machine was 200% of life on the transfer belt assy. =^..^=
              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

                • allan
                  RTFM!!

                  5,000+ Posts
                  • Apr 2010
                  • 5445
                  #5
                  Re: Konica Minolta bizhub C258 image quality problem

                  Make sure the laser slit glasses are clean. Print CMYK half-tone at 127 and post that. If the lines match up on all four prints the transfer belt could be toast. The transfer belts can fail way before yield if a lot of card stock goes thru the machine. See failures from around 100K.

                  If you don't have a manual get one.
                  Whatever

                    Comment

                    • Ihar
                      Technician
                      • Nov 2020
                      • 17
                      #6
                      Re: Konica Minolta bizhub C258 image quality problem

                      The laser slit glasses are clean - I cleaned it with brush on the back side of the front door.
                      I think the problem is with C and M Drum Unit (not with transfer belt, because black and yellow test pages look good).
                      Attached Files

                        Comment

                        • allan
                          RTFM!!

                          5,000+ Posts
                          • Apr 2010
                          • 5445
                          #7
                          Re: Konica Minolta bizhub C258 image quality problem

                          Originally posted by Ihar
                          The laser slit glasses are clean - I cleaned it with brush on the back side of the front door.
                          I think the problem is with C and M Drum Unit (not with transfer belt, because black and yellow test pages look good).

                          At gradient 255 the color almost always looks great. Set it to around 125 then the detail will show a lot better.
                          Last edited by allan; 01-21-2021, 10:14 PM.
                          Whatever

                            Comment

                            • blackcat4866
                              Master Of The Obvious

                              Site Contributor
                              10,000+ Posts
                              • Jul 2007
                              • 22699
                              #8
                              Re: Konica Minolta bizhub C258 image quality problem

                              I disagree on the drums.

                              There are four unique primary charge rollers in the primary transfer belt unit. One for each color CMYK. =^..^=
                              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

                                • BillyCarpenter
                                  Field Supervisor

                                  Site Contributor
                                  VIP Subscriber
                                  10,000+ Posts
                                  • Aug 2020
                                  • 14752
                                  #9
                                  Re: Konica Minolta bizhub C258 image quality problem

                                  Originally posted by blackcat4866
                                  I disagree on the drums.

                                  There are four unique primary charge rollers in the primary transfer belt unit. One for each color CMYK. =^..^=

                                  I was examining the transfer belt for a Kyocera the other day and I noticed that it has 4 primary charge rollers. I assumed that is for the purpose of charging the upper length of the belt. It appears that would be incorrect. Let me take a guess.

                                  The individual colors need a different charge on the belt because of the different properties of each color toner? Just a guess.
                                  Adversity temporarily visits a strong man but stays with the weak for a lifetime.

                                    Comment

                                    • Ihar
                                      Technician
                                      • Nov 2020
                                      • 17
                                      #10
                                      Re: Konica Minolta bizhub C258 image quality problem

                                      I don't have service manual for this model and cann't see Drum Unit count life status. Anybody know how to see it?
                                      The new one (Drum unit A7U40TD DR-313 YMC) has only 55k pages (or it's mine diller mistake)?

                                        Comment

                                        • konicavod
                                          Technician
                                          • Feb 2020
                                          • 27
                                          #11
                                          Re: Konica Minolta bizhub C258 image quality problem

                                          Originally posted by Ihar
                                          cann't see Drum Unit count life status.
                                          you can use web interface for it.

                                            Comment

                                            • blackcat4866
                                              Master Of The Obvious

                                              Site Contributor
                                              10,000+ Posts
                                              • Jul 2007
                                              • 22699
                                              #12
                                              Re: Konica Minolta bizhub C258 image quality problem

                                              Originally posted by BillyCarpenter
                                              I was examining the transfer belt for a Kyocera the other day and I noticed that it has 4 primary charge rollers. I assumed that is for the purpose of charging the upper length of the belt. It appears that would be incorrect. Let me take a guess.

                                              The individual colors need a different charge on the belt because of the different properties of each color toner? Just a guess.
                                              Sorry, no. Each primary transfer roller transfers the single color image CMYK from each drum to the primary transfer belt. There is a mechanism to lift the CMY primary transfer rollers away from the drum when black only images are being made. On every machine I've ever worked on the (4) primary rollers are identical. There are other rollers called "facing rollers" that tension the belt.
                                              =^..^=
                                              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

                                                • Ihar
                                                  Technician
                                                  • Nov 2020
                                                  • 17
                                                  #13
                                                  Re: Konica Minolta bizhub C258 image quality problem

                                                  Replacing the Drum Unit gave a result. Left one is before replacing - right one is after.
                                                  befAft.jpg

                                                    Comment

                                                    • fornerm
                                                      Technician

                                                      50+ Posts
                                                      • Apr 2010
                                                      • 82
                                                      #14
                                                      Re: Konica Minolta bizhub C258 image quality problem

                                                      Hi,this is interesting, i have the exact same problem with a 308 since yesterday.After I have done all the standard things, even change ITB, DV Units looking good, the following happens when changing the drum ..... see pictures ......
                                                      Before with stripes and dots, then still dots, at the moment I can't get any further .....
                                                      And another interssting thing, the old Drums looking good as well,                                                       stripes also go partly diagonally

                                                      There have been reports of a blown HV plastic block near the drive. Can that be?
                                                      Any Idea ?

                                                      mfg Markus
                                                      befor.jpgafter.jpg

                                                        Comment

                                                        • CP-1015
                                                          Trusted Tech

                                                          Site Contributor
                                                          250+ Posts
                                                          • Nov 2020
                                                          • 285
                                                          #15
                                                          Re: Konica Minolta bizhub C258 image quality problem

                                                          Originally posted by Ihar

                                                          How can i see the drum units count?

                                                          bit switch 227 hex 00

                                                            Comment

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