I have an MP C 5503 with a SR 3140 finisher that occasionally tells us that the shift tray is full. This message is false, no paper present. After spending some time checking the SR 3140 sensors, motors, and such, I swapped the finisher for another one. The second SR 3140 gives the same thing. Now realizing I may not have a finisher problem, I have updated firmware for the 5503. Still get the shift tray full message. I have unplugged finisher so customer can use machine with just the minimum of frustration. Please, any help will be welcome.
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