Why does it have alarm light on and indicates paper jam?

SOURCE: says paper jam but there is none. pixma mp450

Take any paper out of the paper feeder and get a plastic ruler the softer the better lift the top of the printer up so you can see where the print cartridges are now push the ruler down through the paper feed roller be careful because you could break the rollers go from left to right right to left twice and check for any debris once you have done this unplug the printer for about 20 seconds then plug back in and let it reset then try copying or printing a doc and see how you go!

SOURCE: Canon MX300 Paper Jam alarm

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SOURCE: my canon mx310 keeps showing a paper jam alarm and there is no paper jam. how do I fix it?

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: Canon MX300 Paper Jam alarm

Forcing a piece of cardstock as far into the feed as I could, then removing it fixed this problem for me.

Hopefully it will work for you!

SOURCE: Paper Jammed alarm shows, even though there isn't

paper-jam alarm shows even though there is't one