Question about Riso RZ390 Duplicator

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Riso ? One Stripe in the middle.

On some masters, my Riso RA 4200 prints one thin line in the middle. I believe this is coming from the small arm that is right next to the drum unit.

does anyone know how to avoid this?

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Yes you are right. The 'stripper finger' is not lifted enough so it scratches the master.

I know this problem from a GR. But the procedure should be nearly the same for your machine. Behind the back cover you will find a small rubber roller. Diameter 12mm (1/2") or so. This roller runs at the excentic curve of the drum. You might find that the rubber is worn of and so the finger cannot be lifted enough any more. You have to replace it.
(Hint: For a fast momentarily solution you may fix it by several windings of adhesive tape.)

Posted on May 01, 2011

  • Vincent Schneider Nov 05, 2012

    Hello philip68! now i have a similar problem with my Riso RZ 370 EP: in every master I have a 12 cm long scratch at the very end of it. In this scratch it always more colour leaking out. When I scale from A4 to A3 the scratch vanishes. Is the masterunit broken? Help please! Thanx in advance!



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