There are pickup roller and separation pad. You can remove both from printer -those are replaceable parts. There are 2 latches or whatever they call them - for roller to get free and you can use flat screwdriver to release separation pad. I would suggest - to clean or replace both (they should be cheap) and that could solve your problem. Also that could be metal piece that sticks to solenoid, when engages and not releasing after cycle of one sheet. Take cover off and check how solenoid is working. Good luck!