Question about Riso Office Equipment & Supplies

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Riso RZ390 has a timing problem and folds back each page. It has 1.7 mil on the meter. The sales guy came by and gave us a price of 1585.46 to fix it.

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I can't explain how to re-time your machine here.. it's too complicated.. However.. go on line and look up Riso tec manuals.. Buy a cd for about $35.00 and look up how to re-time the machine.. It's a lot of work but with the manual you can see where the marks should be. You have to remove the back cover and look at all the cams and gears.. they all have marks.. It's not the end of the world if you're handy..

Posted on Aug 11, 2009


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1 Answer

Why do not feed more than one or two pages

Check if there is dust or if the output is holding paper sheets to pass. It may be that some of the gear output paper is loosely screw on the shaft causing the problem. Also check the registration sensor inside the machine and clean it. I hope I helped you.

Jul 08, 2014 | Riso RZ390 Duplicator

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How to adjust a clutch on a Riso GR 3790?

Chances are good the clutch does need to be replaced. These are magnetic and while they can be cleaned, eventually they will fail and parts are no longer generally available.

As well if you pull the clutch to clean it you have to be VERY careful to mark everything and lock the gears into place. Retiming these old guys if they lose timing is something I'm successful at about 2 out 3 times. Most of them are pretty worn out and nothing wants to quite line back up right once you lose it.

Jun 13, 2014 | Riso RZ390 Duplicator

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Necesito bajar el driver de la riso rz 390 ui gratis

Please follow this link to download the driver from the original source - Riso:

Please notice that this site is in German language, but do not hesitate you will find what you need!

Apr 21, 2011 | Riso RZ390 Duplicator

1 Answer

Riso RZ390UI a code of H010 comes up. What is the probelsm

Error H01 means: Cannot get consumables info. Input values required.
1: black / 2: color

Mar 18, 2011 | Riso RZ390 Duplicator

1 Answer

Error code A-06-403 on the Riso RZ390 - what does it mean?

A06-403 from the manual: either the upper or lower safety switch of the paper feed tray is off. Unplug/replug or replace.

Aug 26, 2010 | Riso RZ390 Duplicator

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Wont print red ink

There is no master on the drum. you need to make a master.

May 25, 2010 | Riso RZ390 Duplicator

1 Answer

Riso ? One Stripe in the middle.

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.)

May 04, 2010 | Riso RZ390 Duplicator

1 Answer


goto the support page... on the top colorfull bar and from there goto technical support then create an account and find your driver...

Apr 20, 2010 | Riso RZ390 Duplicator

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