Haven't used a Mutoh but on our Mimaki we just put a piece of tape over the End of Roll sensor. Try that first, sometimes simple hacks are the best. Otherwise you're probably looking at replacing that sensor or possibly the board it connects to.
I'm running a Mutoh ValueJet 1304, and for the past two months, it has been quitting mid print and giving me the "End of Roll" notification. I'd love to bypass that sensor completely, but I'm open to any ideas at this point. Thank you.
Usually one of these:
Media loading - if not straight, media will lift off the sensor and give error.
Dirty sensor, sensor needing adjustment, or printing on the back of the roll triggering sensor.
Temporarily, you can cover the sensor.
But you will want to find the cause.
the 3M logo on the backer will also trigger a sensor error on that printer.
the 3M logo on the backer will also trigger a sensor error on that printer.