This model is pretty obsolete, finding someone to service it will be difficult, and most will only promise to attempt it and not warranty the work, never the less, its what I recommend. If you must attempt it yourself, I recommend a set of picks from Menard's (around $5 for a set, they look like dental picks) and an exacto knife and then cut the master free in small pieces.
most riso techs who are trained on these will do a partial disassemble. If this were an RZ or an EZ I'd be willing to try talking you through that. I don't recommend it if you're a novice on these though. They're much crankier.
SOURCE: Showing paper jam at master disposal NOTHING THERE
Have you switched off/on the machine holding down the reset key?
SOURCE: problem of C25 risograph cr 1610
Remove the old mater on drum and clean your master incoder strip and sensor. Look also at your drum clamp and bend the 2 sides of the 2 arms a bit up that goes under the clamp unit so that it can open a bit wider. let me know if you still struggling.
SOURCE: My Risograph CR1610EP will not make a master. I
We had the same problem in that once master was done, it did not print. We tried this solution.
Machine must be off. Top right hand corner the and - buttons with arrows on (to align your print either left or right) press these down simultaneously. While holding them switch machine on.
A number 203 will appear on your screen.
Release hold on buttons Press 101 on number board you will hear machine inking master. Allow it to run until complete.
Hope this helps.
SOURCE: Risograph GR3770 - cannot pul out the drum, Error
This solution is ONLY for pulling out the drum.
Open front door. If you look at the metal housing below the drum you will see a plate mounteg with two screws. Get it off and you will see a small lever. Turn it right to loosen the drum. Be extremely careful when pulling out the drum. If the drum is not in zero-position it might be a bit difficult (e.g. have a look at the master clamp). Please note that it may be difficult to insert the drum again.
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