Your tech needs to get in and clean the paper IN sensor in the second paper feed section. It will take close to an hour to tear down, clean and put back together. It's the little clear eye that is barely visable between the feed tires and the drum. There are two, send and receive. Canned air and alcohol only work for so long, the dust is inside the case.
Riso came out with a modified sensor and dust cover to stop this problem. 020-11754, 020-11755 Covers. 444-42028-106 Sensor
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