In my case booklet fold motor was faulty. Before change, old motor was quite noisy also.
All th best,
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If we make booklet prints, also stapled, Tray Belt Drive Motor moves only 2-3mm and wont carry away finished booklets from booklet unit and after 5-6 booklets they stuck together booklet unit and machine sees jam.
What i did also:
1) Tried another booklat tray - No results
2) Initialized finisher NWM - No Results
3) Reinstalled finisher ROM soft - No results.