Paper won't feed - HP LaserJet 1020 Printer

Paper may be trapped (paper jam).

BROTHER MFC 230 will not feed paper after a jam

mi sumadora, de repente se queda en E y no me deja seguir sumando cantidades que solucion tiene esto

Pls, I have risograph FR3950EP
I need the full drum unit, computer interface card, master and inks of different colours. Kindly help me out. I am in Nigeria.email: [email protected]

See if the alignments for the paper are properly place to guide the paper,nothing loose.Thank you.

When the paper does not feed straight, dirty or stickyrollers can cause it to jamb or crinkle, also failure to remove all traces ofpaper from a previous paper jamb will cause further paper jambs.
Check for tiny pieces of at the edges of the rollers, and remove these piecesof paper. The rollers may be dirty or sticky and causes the paper tonot feed straight.
Try cleaning the rollers with methylated spirits.

Your machine needs to be serviced.
replace the cartridge with the original one.
it can not print if one cartridge is missing or not original.

paper start sensor is not functioning properly. clean it or replace it.

There are a couple of possibilities. First is a little piece of paper could be stuck somewhere along the paper path and is causing one of the feed rollers to not grab the paper evenly, which will make the page twist on most of the models in this series, if you pull the paper out and take a flashlight and look up the feed path you will usually see anything in the feed path near/on the rollers at the top.
Another possibility is one of the feed rollers is old and worn out (If machine gets heavy use) and it will cause same issue.
Also light paper stock can sometimes be too thin for the rollers to grab properly and cause it to twist and slide around. This is usually more of an issue with gravity/drop feed printers but can also occur on front feed style too. Usually 20lb stock is good, but if thats doing it, you can try going to a 24lb.

Best solution is to clean the head with it in place,here's
the manual for your printer