Ahh hard to reach paper jam...
Impatient users forget to lift up the entrance guide A11P702304 of the finisher when had a paper jam and bang the door shut only to knock off C-clip and/or defroms the guide. Now the guide floats and gives funny jams as it sometimes blocks the photointerrupter PS1 in entrance of finisher. You clear jam sometimes in luck to re-seat the guide and all works for hudreds of pages.
Option 2 is the sensor PS3 in stacker unit with like a square little bucket underneath ( you will see it when you take the stapler front cover off ) blast the PS and bucket with air and whilst at it, clean the PS11 Stacker plate sensor
(with the small half moon actuator).
Option 3 is the PS15 sensor in paper alignment/collecting area gets fairly dusty since paper sits on top of it.(Easily forgoten and easy to clean with duster cloth)
Option 3 your SD2 had broken spring and bypass gate isn't swithching.(This SD was modified with better spring)
How old is the finisher and what is the mileage of machine?
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