Samsung SCX4100 MF printer has intermittent paper jam 0 error. If paper is fed manually into the rollers it works fine.

SOURCE: HP 2840 printer paper jam

does the paper feed at all(1/2 way) no feed,if not pick-up paper most likely will be feed motor if 1/4,1/2 or 3/4 fed will be sensor at falt or 2nd tray conectors dirty or making false contact.

SOURCE: Okidata-B6200-

Check the reg sensor for dirt etc and paper setting is correct in the paper tray

SOURCE: Rear Paper Jam - No paper present.

Look for a small piece of paper that may be stuck in the switch indicating a paper jam.

SOURCE: paper jam ,no paper jam found Dell 1815dn

give this a try

1. Turn off the printer.
2. Remove any paper trays. Inspect them for wrinkled or damaged paper.
3. Also open the back cover of the printer if this model has one.
4. Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
5. If necessary, remove the toner or ink cartridge. Place it away from light/ sun light to avoid damaging it.
6. If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly. The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
7. If the paper does tear, try rotating the roller gears manually to free the paper. Don't force anything, though. Do this step especially if the jam message comes up repeatedly without any obvious paper jam, there may be a small tear of paper inside.
8. Ones the printer is free of paper Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
9. If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
10. see alternative if the problem is still not solved.
    

SOURCE: HP PSC 1350 printer won't feed paper

Check the gear on the left side of your printer where the disk encoder strip is attach,the gear is not holding the metal shaft your need to replace that gear. The problem is in the inner hole where the shafting is attached.