Hi I'm new to the forum and just recently obtained a RISO GR 3770 duplicator. The duplicator had been sitting unused for at least two years and all the drums were dry. After cleaning a bit with alcohol and running a few hundred prints I got one of the drums making pretty good prints, but still there is an area of uneven print in the middle of the paper that goes all the way from top to bottom (picture attached) I tested it with another drum and the print had a similar effect, so my uneducated guess is that this could be an issue with the pressure roller ? I tried to clean the pressure roller with alcohol but it didn't affect the quality of the print. Can I solve this problem by changing a new pressure roller ? and if so, are there good instructions available how to do it ?
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