Yesterday they ran a piece of film through the machine and it said it ran out but it actually had a few feet left on it and the image setter as usual just ran out the extra but stopped about a foot short with that error. We turned off the processor and back on to get it to finish running it out but it never stopped. It just runs for a while then gives us a input jam error. The switch on the end of the dryer seems to be fine and I'm guessing the input sensor is what's in the bridge but not sure how to check and see if it's working. Any ideas. Thanks.