Optical Skew bizhub C6000

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  • blackcat4866
    Master Of The Obvious

    Site Contributor
    10,000+ Posts
    • Jul 2007
    • 22743
    #1

    Optical Skew bizhub C6000

    So, I've got an optical skew affecting all colors in the crossfeed direction of 1.5mm. In the feed direction it stays pretty consistently without skew. Naturally, it's most noticeable when duplexing, since the lines seen through the paper appear twice as skewed.

    I've found this little tidbit in the service manual:
    To correct this skew, adjust the skew of the G5 lens of the write unit /K.
    Perform this adjustment manually using the following menus:
    "Both Sides Adj."
    "Chart Adjustment" of the user mode
    "Machine Adjustment > Printer Adjustment > CD-Mag. Skew Adjustment"

    The C, M, and Y, can be adjusted automatically or individually, but in reference to the black write unit /K. "CD-Mag. Skew Adjustment" moves a total of 0.6mm, about 1/3 of the correction I'm looking for (if it worked, and doesn't). So after all that, how do you adjust the G5 lens of write unit /K? =^..^=
    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 =^..^=
    Tags: adjustment, optical, skew, unit, write
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22743
      #2
      Re: Optical Skew bizhub C6000

      bump. =^..^=
      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

        • Woxner
          Senior Tech

          500+ Posts
          • Jul 2011
          • 814
          #3
          Re: Optical Skew bizhub C6000

          thats funny i never seen an optic skew affected by laser unit... dont you mean you have a skew in the machine and not optics?

            Comment

            • blackcat4866
              Master Of The Obvious

              Site Contributor
              10,000+ Posts
              • Jul 2007
              • 22743
              #4
              Re: Optical Skew bizhub C6000

              The laser is an optical device. The problem presents on internal prints, so clearly it isn't scanner optics, it's a laser adjustment.

              As opposed to a paper skew. =^..^=
              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

                • D_L_P
                  Self Employed

                  1,000+ Posts
                  • Oct 2009
                  • 1196
                  #5
                  Re: Optical Skew bizhub C6000

                  Originally posted by blackcat4866
                  The laser is an optical device. The problem presents on internal prints, so clearly it isn't scanner optics, it's a laser adjustment.

                  As opposed to a paper skew. =^..^=
                  Optical skews are the worst. Especially because it is easy to go past 'square' and skew the other way.
                  If .6mm isn't gonna get you there, maybe there is a mechanical adjustment for the PH?
                  If nothing else maybe forcing a shim would get you close enough that the .6mm would work?

                    Comment

                    • blackcat4866
                      Master Of The Obvious

                      Site Contributor
                      10,000+ Posts
                      • Jul 2007
                      • 22743
                      #6
                      Re: Optical Skew bizhub C6000

                      Originally posted by D_L_P
                      Optical skews are the worst. Especially because it is easy to go past 'square' and skew the other way.
                      If .6mm isn't gonna get you there, maybe there is a mechanical adjustment for the PH?
                      If nothing else maybe forcing a shim would get you close enough that the .6mm would work?
                      Since the black laser is my reference, my fear is going back down that road of beam detect errors, that I fought with last year. Since this customer is billable, I'll present it as an option (a dangerous option).
                      =^..^=
                      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

                        • blackcat4866
                          Master Of The Obvious

                          Site Contributor
                          10,000+ Posts
                          • Jul 2007
                          • 22743
                          #7
                          Re: Optical Skew bizhub C6000

                          Originally posted by blackcat4866
                          ... So after all that, how do you adjust the G5 lens of write unit /K? =^..^=
                          Anybody else? I find it interesting that the manual tells what you need to do, just not how to do it.
                          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

                            • Synthohol
                              Certified Konica Expert

                              Site Contributor
                              5,000+ Posts
                              • Mar 2016
                              • 5506
                              #8
                              Re: Optical Skew bizhub C6000

                              have you tried swapping drums? only because if even some developer is stuck in the drums contact points of the process unit it can make a trapezoid kind of thing.
                              did you try the "both sides adjustment?" i have an 18" clear scale (ruler for the novice )that knocks this out in no time.
                              remember to zero out the adjustment prior to printing the test pattern.
                              you probably know this but i typed it for the greenhorns.
                              We know a thing or two because we've seen a thing or two.
                              The medication helps though...

                                Comment

                                • blackcat4866
                                  Master Of The Obvious

                                  Site Contributor
                                  10,000+ Posts
                                  • Jul 2007
                                  • 22743
                                  #9
                                  Re: Optical Skew bizhub C6000

                                  I kinda doubt that it's the drum, mostly because this machine has been through 5 black drums in the last year, and the optical skew has not changed. It's a thought though.

                                  I have not looked into the paper tray settings > Both Sides Adjustment. Now that you mention it, there may be a skew adjustment there.

                                  A complicating factor here is multiple techs approaching this task differently: some as a paper skew, some as an optical skew, some as a scanner skew. The first thing that I discovered is the plastic aligning bracket under the front of the fuser was barely attached, hanging from the last few threads of one of the screws. Each time the lower duplex door closed, it landed in a slightly different spot. Most of the painted-screw adjustments for that door have been moved around and many of the screws loose, so I have no real idea where it should be. The paper seems to travel a fairly straight path now though.

                                  Thanks for your thoughts. =^..^=
                                  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

                                    • Synthohol
                                      Certified Konica Expert

                                      Site Contributor
                                      5,000+ Posts
                                      • Mar 2016
                                      • 5506
                                      #10
                                      Re: Optical Skew bizhub C6000

                                      the b/s adj should correct for trapezoid that masks itself as skew as well.
                                      We know a thing or two because we've seen a thing or two.
                                      The medication helps though...

                                        Comment

                                        • JR2ALTA
                                          Service Manager

                                          Site Contributor
                                          1,000+ Posts
                                          • Feb 2010
                                          • 2017
                                          #11
                                          Re: Optical Skew bizhub C6000

                                          isn't 1.5mm within spec?

                                            Comment

                                            • blackcat4866
                                              Master Of The Obvious

                                              Site Contributor
                                              10,000+ Posts
                                              • Jul 2007
                                              • 22743
                                              #12
                                              Re: Optical Skew bizhub C6000

                                              Not for a print shop. =^..^=
                                              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

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