My riso RZ 310UI will not recognize when drum is inserted. Machine 'beeps' but does not lock drum in place.
This happened after masters were not disposing properly and were wrapping around disposal bits, causing machine to jam.
Masters were cleaned out, but machine was unresponsive, even after reset. (Would make a whirling sound like it was inking but not print).
Could not eject drum or thermal units. (lock/unlock buttons pressed to no effect)
I had read that similar symptoms could be caused by drum not being in correct position.
Finally able to get drum out, but now putting the drum back in the machine, it's not recognized. Doesn't lock in. No error code.
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