Copier is showing jam code 010F (PS12 sensor) with 4 or more duplex copies. One sided copies - no problem at all. In duplex mode, 1 copy - no problem, 2 copies - no problem, 3 copies - no problem but 4 or more copies it jams every time - one copy comes out of the finisher but the other 3 are stacked under the fuser rollers with leading paper halfway under the roller. Seems to me that the jam code displayed (duplexing reversal sensor PS12) is nowhere near where the paper is stuck. I checked the wiring, sensor checks all OK. What puzzles me is - no issues with 1,2,3 copies? If any one can shed some light, I'd appreciate it. Thanks in advance.
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