Keep getting misfed paper message. can't see paper

This means the machine has been turned on with a jam inside the machine someplace. If you have opened everything in the machine and found nothing then it is time to call a service technician.

That sucks, I guess you screwed something up.

It sounds as if it is not picking up the paper from the tray. It might need new feed rollers. Another thing to check is the lift arms on both sides of the tray. Make sure the springs are still attached to them. There is also a little switch on the left side front of the tray that adjusts the bottom plate pressure. You can try adjusting that to see if it helps.

You have to replace the drum unit corresponding to the colors that will appear in the paper

need new feed tires. -Carl

The sensor arm just below the registration roller has dropped the spring to return it to it's home position.

I just came across this post, you've likely solved it by now; However it is a "Toner density" error related to your cyan photoconductor. It is a defective connector. Replacing the cyan photoconductor should solve problem.

It may be something to do with the paper size settings on printer driver, document print settings or page setup. If for example the computer thinks the paper size is Letter, and the paper in Tray 1/2/3 is A4, it won't print.

Thermisters are located in the fuser unit. They contact the rollers. Good luck

1. Check that absolutely no paper is jammed within the infeed paper sensors. Sometimes a tiny piece of paper will get stuck in the sensor after a jammed sheet has been forcibly removed.
2. Use a can of Dust-Off or similar compressed air product to blow the paper path out. Paper lint can block a sensor.