Question about Riso RZ220 Duplicator

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Movement I notice you seem to have some experience on the Riso (Gr3770). Do you have a solution for this problem. I am sure you have heard of this problem many time if you have worked with the RISO in the past. Anyway, here goes. How can I keep my riso from moving all over the place when it prints? No 2 pages seem to come out in the same position. Each sheet can move up to 1/4 inch, forward or backward. I have cleaned the clutch and all the feed tires. I am semi-handi when it comes to repair, I just need a little direction.

Posted by PositiveBud on

  • PositiveBud Apr 26, 2008

    I have replaced the clutch already, once in the past.

    Its the much bigger and stronger clutch than what came out of the GR originally. I did work for several months. And I have cleaned and scrubbed the rollers many, many time. That just does not seem to work. Thanks for trying.



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This is normally down to the 'double feed prevention' - the screws by the feed tyres adjust the angle.
In theory it shouldn't make any difference, down to the timing being adjust by the mylar afterwards, but in practice it makes a huge difference,

Hope this helps


Posted on Jun 01, 2008



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Riso's are famous for this, i will scrub the rubber timing roll with rubber rejuvenator and clean the steel roll with alcohol.

the riso paper feed clutches are weak compared to what they were in the GR series you may have to replace the clutch.

Posted on Apr 25, 2008

  • Anonymous Apr 29, 2008

    Bud, after doing some research you need to clean the oneway bearings on the pickup and feed rolls, adjust feed table hieght and lastly check/adjust timing in drive and feed roller-you will need a manual for this.



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