I have a GR3770 that has the "Disposal Error remove cylinder and discard master" message. When the message first occurred there were multiple masters folded up in the used master disposal cassette like an accordion. I removed them all and the error persisted. I checked the pathway for any sign of a piece of torn master, cleaned the master disposal sensor with a q tip and alcohol, removed the master from the cylinder, return cylinder to machine with no master on it, reinstalled the master roll, and even re-powered the machine with the reset button held to clear the error. Done most of these steps multiple times and the error still persists after attempting to make a new master. I even tried a different cylinder with a master already on it. Still getting the same error. Help!
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