HP J4580 OfficeJet death.
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paper rollers exposed, easy, do not remove the PCB on top left rear, the next step is gently remove the left gear protector cover, it has no screws you just trick it out. by hand. and now the big encoder drive #2 is exposed, and you then see it spin, turned on and the shaft dead. No more guessing now ,right? if the shaft turns ok, and the snatch single roller is dead those bad gears on the right are not fixable (IMO)