MZ790 Horizontal print position / second drum print school

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  • mixedfeelings
    Technician

    50+ Posts
    • Sep 2010
    • 98
    #1

    MZ790 Horizontal print position / second drum print school

    Hi All -
    I have finally been fixing up and aligning an mz790 and I have run into a couple of problems:

    Horizontal print position:
    All masters are created with the horizontal position 1/16" - 3/32" to the right. I have tried adjusting the horizontal drum / main position using test modes using test modes 973 (drum) and 974 (machine) to no avail. Is there a way to change the center position of the TPH as there was with the RP models?

    Second drum skew
    The master has a clockwise skew, but is not substantial. I used the slide shaft to compensate for it and I got close - but i ran out of room to slide it any more - it's right to the edge. I have tried multiple drums, and swapped the drum positions and the first drum is always pretty good, but the second is always a little skewed. Are there other options besides the slide shaft? Is there a way to adjust the feed between the two drums? perhaps that path is where its going awry?

    Thanks!
    Tags: None
    • Iowatech
      Not a service manager

      2,500+ Posts
      • Dec 2009
      • 3930
      #2
      Re: MZ790 Horizontal print position / second drum print school

      Pictures, please?

        Comment

        • mixedfeelings
          Technician

          50+ Posts
          • Sep 2010
          • 98
          #3
          Re: MZ790 Horizontal print position / second drum print school

          Hi Iowatech! I would gladly take a picture - what do you want to see?

          Thanks!

            Comment

            • Iowatech
              Not a service manager

              2,500+ Posts
              • Dec 2009
              • 3930
              #4
              Re: MZ790 Horizontal print position / second drum print school

              Well, if you could pull the drum out after it made a skewed master and take a picture of the top of the drum cavity, that would be a good one. A picture of the skewed master on the drum or a print from one of them would be helpful too. And if you could open up the master making unit like you were going to load a new master roll, and take a picture of the master material being fed into the unit, that would also be helpful.

                Comment

                • mixedfeelings
                  Technician

                  50+ Posts
                  • Sep 2010
                  • 98
                  #5

                    Comment

                    • jermyth
                      Riso dude

                      250+ Posts
                      • Mar 2011
                      • 437
                      #6
                      Re: MZ790 Horizontal print position / second drum print school

                      Second drum position having masters getting skewed could be from the impression roller having uneven pressure on the drum. Does it happen with all drums used? I believe the adjustment for the pressure roller is in the manual, personal haven't had to do it.
                      Good luck.

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