bizhub 920 MAKING BLADE MARKS

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  • methogod
    Senior Tech

    Site Contributor
    500+ Posts
    • Dec 2008
    • 915
    #1

    bizhub 920 MAKING BLADE MARKS

    This is now the 2nd time in 40K that i have seen this. The first time manually flipped the blade. PM, DV, Drum all are around 250K maybe slightly more. Every now and again you get this when a blade is bad or its a old blade.

    I will replace it once more, to see if its just happened to be an old pm kit. But any suggestions. Any one ever increase the pressure the blade makes on the drum? is there even an adjustment?

    I consider myself a 920/950 specialist, but this is puzzling, because as i have said never seen it happen so fast on 2 blades in a row. Cleaner unit has about 5.5M on it as does dv unit. Runs like a champ other then this...

    thanks,
    Tags: dehumidifier
    • Gaffers01
      Trusted Tech

      Site Contributor
      250+ Posts
      • May 2011
      • 333
      #2
      Re: bizhub 920 MAKING BLADE MARKS

      First thing never call yourself an expert on a machine, that's just asking for trouble. machines have ears don't you know.

      Is there an aircon unit near the machine, as I had a problem with a C8000 with flipping blades in the mornings and I couldn't figure out what was causing it. I happend to be at the customers one morning when the aircon guy was there and chatting with him he told me than when the units first come on in the mornings the air temperature changes rappidly thus i thought it could be causing the problem.

      I informed the customer and they were happy with me to move the machine to the opposite wall, and since then I have never been back with that problem and its done over a Million copies.

        Comment

        • methogod
          Senior Tech

          Site Contributor
          500+ Posts
          • Dec 2008
          • 915
          #3
          Re: bizhub 920 MAKING BLADE MARKS

          there is a dehumidifier but its never on during winter...

          i don't see flipping but i am getting marks, if i stop machines they stop and come back...

            Comment

            • juve
              Technician

              50+ Posts
              • Dec 2012
              • 86
              #4
              Re: bizhub 920 MAKING BLADE MARKS

              Originally posted by Gaffers01
              First thing never call yourself an expert on a machine, that's just asking for trouble. machines have ears don't you know.

              Is there an aircon unit near the machine, as I had a problem with a C8000 with flipping blades in the mornings and I couldn't figure out what was causing it. I happend to be at the customers one morning when the aircon guy was there and chatting with him he told me than when the units first come on in the mornings the air temperature changes rappidly thus i thought it could be causing the problem.

              I informed the customer and they were happy with me to move the machine to the opposite wall, and since then I have never been back with that problem and its done over a Million copies.
              well said mate

                Comment

                • methogod
                  Senior Tech

                  Site Contributor
                  500+ Posts
                  • Dec 2008
                  • 915
                  #5
                  Re: bizhub 920 MAKING BLADE MARKS

                  ok I am NOT AN EXPERT, i am the guy other tech call when 7085/920/950/1050/1051 are acting up, i have a few print shops and we do alot of black and white where we self maintain.

                  SO after changing out the blades, any other item that could create blade marks, besides changing out the cleaner unit. I have 7 920/950 as this locations i can test some parts.


                  is there any adjustment to increase blade pressure on the drum? never had to before but 1st for everything...


                  thanks,

                    Comment

                    • Mick01
                      Trusted Tech

                      250+ Posts
                      • Nov 2012
                      • 362
                      #6
                      Re: bizhub 920 MAKING BLADE MARKS

                      Hi,
                      One issue i have had in these cleaning units is the earth connection to the cleaning fur brush roller. Try taking the shaft and bearing off the back of the cleaning unit and thoroughly cleaning it.
                      Hope this helps

                        Comment

                        • methogod
                          Senior Tech

                          Site Contributor
                          500+ Posts
                          • Dec 2008
                          • 915
                          #7
                          Re: bizhub 920 MAKING BLADE MARKS

                          9 Miillion on the meter, 9 million on the CLEANER UNIT ONLY ON ITS SECOND TONER COLLECTION BRUSH...

                          what i think it was is 2 issues, one you can see below that bearing that the scrapper roller, rides in was dry and in 2 peices. The other issues was there was a 95% chance we had some old blades, the kind that came in the white boxes, that really dont work for production printing, I got a huge lot of 920, and 7085 items i think they were in there.

                          Took me a while to clean and rebuild this until, but thanks for all the help.

                          also has some used gears, that were in better shape then what was there, the coupler unit that drives the Toner Collection Brush was so worn away that i was surprise it didn't brake 5m earlier...



                            Comment

                            • methogod
                              Senior Tech

                              Site Contributor
                              500+ Posts
                              • Dec 2008
                              • 915
                              #8
                              Re: bizhub 920 MAKING BLADE MARKS

                              2013-01-27 23.38.19.jpg2013-01-27 23.38.52.jpg2013-01-27 23.38.01.jpg

                              reason 1 - bearing on the cleaning scraping roller was shot (pic's above)

                              reason 2 - cleaning roller was was past due.. also guy cleaning my machines was not cleaning them as well as I do... that has no been rectified..

                              BLADE marks were from old blades, prob from 7085 or 8085, etc... will know more as it unfolds...

                              thanks,

                                Comment

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