Two RP 3105 UI questions re: Drums

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  • studygroup
    • Jul 2025

    #1

    Two RP 3105 UI questions re: Drums

    Hello guys and gals, I have a question and/or 2 problems.
    Please excuse my ignorance, I'm obviously not a copy tech but I've written everything down to the best of my ability.


    I purchased a RP 3105 UI about a year ago and have done next to nothing
    with it.
    I printed some one color fliers (it came with a black drum) and then I
    ordered 3 more drums off the internet.
    The black drum I have worked fine.

    I got my new drums and tried them out.

    they all pretty much did this:
    Insert drum> start making prints > make about 5-10 prints > disengage from
    the machine

    I checked, and the drums all have the little ridge on the end of them that
    some RP drums don't have, so theoretically it should work.

    The person I bought the drums from hypothesized that they are running at a
    different speed than the machine (?) and so they want to disengage.
    There was one drum that basically wouldn't stay in for a whole print, but
    most of them would at least make one copy before popping out and the Riso
    telling me to insert a print cylinder.

    so that's one problem.


    THE OTHER, more immediate problem is that while I was f*cking around with
    all these drums, my machine kept acting weird and not wanting to release
    the drums it was telling me to insert in the first place.
    So, (stupidly) I did a "cool trick" on myself and turned the machine off and on again, and
    the cylinder released. I did this a second time while trying to figure it
    all out, and now when I turn on the machine, it's doing this thing where it:
    (a) tells me to insert a drum, and
    (b) I CAN'T insert a drum, because none of them will go all the way into
    the machine anymore.


    The closest thing I can figure out is that there's a hole in the back where
    the main cylinder shaft goes in and engages, and there's a wire/bar that
    pops down and locks the shaft into place, and it's now just permanently
    down and the shaft can't go in? I'm not sure. I've tried shoving them in
    but not crazy hard so as not to break anything (no dice), and I've tried
    pushing the bar in with a screwdriver. When I do that, the bar whirs back
    for a second and then locks back into place.


    NEEDLESS TO SAY I would appreciate any help anyone had to offer.
    I really need to get printing!


    Thanks.
  • mixedfeelings
    Technician

    50+ Posts
    • Sep 2010
    • 98

    #2
    Re: Two RP 3105 UI questions re: Drums

    I am not sure about the first question (whoa) but, regarding the second issue - when I had a similar problem I discovered that my drums weren't locked into the starting position when i tried to insert the drum. They would get about 3/4s or more of the way in and get caught up on something. I eventually discovered that if you unlock the drum (there is a little clasp towards the back left of the drum) and the rotate it a little bit to the left it will relock into the starting position and I could push the drum in all the way.

    It doesn't happen all the time - but it does fairly regularly.

    Comment

    • mixedfeelings
      Technician

      50+ Posts
      • Sep 2010
      • 98

      #3
      Re: Two RP 3105 UI questions re: Drums

      Nevermind what I said before, Suddenly I am having the same problem - with something blocking something somewhere and not being able to insert any drum all the way. ugh.

      Comment

      • jermyth
        Riso dude

        250+ Posts
        • Mar 2011
        • 440

        #4
        Re: Two RP 3105 UI questions re: Drums

        Wow....were to start. It could be more than one problem. It's possible the machine is out of time and the drum drive gears have broken. Pressure springs could be broken. If it was just a drum disengaging I've had the shaft on the drum get bent/nicked and have to be replace the shaft. Of all the possibles the first is the worst. You got to have a tech or the manual to replace those gears. And I haven't seen the gears on Ebay either, and they are expensive.

        Good luck.

        Comment

        • mixedfeelings
          Technician

          50+ Posts
          • Sep 2010
          • 98

          #5
          Re: Two RP 3105 UI questions re: Drums

          Did you manually turn the main motor shaft inside the machine at all? Not the thing in the middle, but the protruding rubbery thing in the lower left. That ended up being my problem, I had the rectangular slot up and down, but didn't notice that the little outcrop that corresponds with the bump on the drum was on the wrong side.

          I also learned that turning the that shaft a full revolution manually will definitely mess up the timing, and you will definitely have to call in a tech to get that fixed.

          Luckily I remembered which way I had turned it originally and was able to undo what i done before and noticed any timing issues.

          Comment

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