I can not see see paper jam, but it says 202 paper jam open rear door.

door. 3 Push down on the green lever. 24x Paper Jam, Check Tray 1 Gently open the ... Jam, Check MP Feeder Gently pull the jam straight out of the multipurpose feeder. 202 Paper Jam, Open Rear Door 1 Open the ... side to locate a green lever. Note: To clear the Paper Jam error message, you must remove ... above Tray 1 when the duplex function is in use. To clear this type of jam, follow the instructions under the appropriate paper jam message. Lever 4 Gently pull the jam toward you. 5 Insert the tray. Note: Make sure... under the print media is locked down. 23x Paper Jam, Remove Tray1, Pull Down ...

What is the last thing you did before receiving this error? Please follow up.

Here are some articles on rear door paper jam on Lexmark X646e printer. Just click on these links: http://bit.ly/blkK1m ("202 Paper Jam" Message on a Lexmark X642e, X642e or X644e Multifunction Printer) and this link: http://bit.ly/awNDER (A 202.xx (x = any number) Paper Jam Message Is Appearing on a Lexmark X64x Series Printer). These are some guidelines on how to resolve the rear door paper jam on your printer. If you need more assistance, don't hesitate to contact Lexmark Technical Support. Thanks.

Typically there is a piece of paper caught in the fuser exit. If no paper evident(ie paper feeds cleanly, stops 1 inch past fuser) verify there are 2 sensor exit flags present and free to move. Occasionally 1 of the flags gets broken off the sensor causing this jam.

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Start by following the steps below to get the paper out from the machine.

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.
    

alternative :
Load a piece of thick paper, for example photo paper and press the resume button (may be diffrent button on diffrent models) a few times to the printer picks up the paper and puts it through the machine.



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If that doesn't help then you would have to start taking apart the machine to find the jammed paper and remove it, its not something a just anyone should do unless you have experience.

you may have to take the machine to a repairer to get the jammed paper bits out of the machine, if you don't see paper jammed in the machine it does not mean that there wouldn't be a paper jam somewhere in the unit along the paper path. Some of the switches or sensors might have gotten stuck.

If you can't see any paper stuck inside the printer when you open the rear door or when you remove the toner cartridge, the rear paper flag is either stuck or broken.
The flag is a small piece of plastic which sits at the rear of the fuser and as the paper exits the fuser it pushes the flag down. The easiest way to see this is to remove the rear door then the rear cover (two screws).
If it's broken you'll require a replacement fuser (i don't think you can get the part separtely), but if you have recently installed a maintenance kit, i would contact the supplier and ask for a replacement.

Have you attempted leaving the printer unplugged (if possible in the on position) for a period of 5-10 Minutes?

If you have a duplexer check in there. also sometimes the paper will get stuck in the fuser and will be torn off inside. you can take the fuser out with a phillips (2 screws) and and 2 plugs. check and rotate fuser by hand to be sure it is clean. re assemble

usually it means that a sensor in your fuser is bad. If you have a P.M. Kit replaced the fuser and clean the printer.

but before you do, make sure that you have cleared all jams, including in the fuser.

Its probably time for a Preventive Maintanence

I cleared that error on one by replacing the fuser. It had a small piece of paper stuck in the roller.