When i try to print a paper i hear 3 rings and paper not printing and this message appear in printer monitor 202 PAPER JAM open rear door and i open rear door and no thing happen please help me

Have you read the Manual on paper removal? It mentions a rear panel that can be removed. That might free up the rollers:
If the paper jam is near the paper input tray:
1. Remove the paper tray.
2. Pull firmly on the paper to remove it.
3. Replace the paper tray.
4. Press the Select button .
5. Resend your print job to print any missing pages.
If the paper jam is not visible:
1. Turn off the printer.
2. Lift the printer unit.
3. Firmly grasp the paper, and gently pull it from the printer.
4. Close the printer unit.
5. Turn on the printer, and print the document again.
If the jam is located in the duplex unit or near the rear access door:
1. If you have a duplex unit, remove it.
2. Open the rear access door.
3. Firmly grasp the paper, and gently pull it from the printer.
4. Close the rear access door.
5. Re-install the duplex unit.
6. Press the Select button to continue printing.
If the paper jam occurs near the ADF:
1. Lift the ADF cover located to the left of the ADF input tray.
2. Firmly grasp the paper, and then gently pull it from the printer.
3. Close the ADF cover.
4. Press the Select button .
5. Resend your print job to print any missing pages.

Be sure the dor sensor is correct

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 ...

Hi,
These are the messages got stuck in print queue, you have to release the print queue, First got to Printer and Faxes, there would be your printer icon (Lexmark E342n) Laser printer icon, double click on that, you would see all the messages stuck in queue, release or delete from there. that has to work, please let me know if it works or not

Hi,

To resolve paper jam issue, follow the steps
1. Open the rear access door.
2. Remove any bits of paper stuck.
3. Clean the rollers using lint free cloth ( upward position )
4. Close the rear access door
5. Open the front panel door
6. Check for any paper stuck between the rollers.
After doing all these steps, to make sure if your printer is working fine, try to make a copy.
If the printer can make copy, Click on the link to resolve printing issue -> Link

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.

HP Officejet 7200, 7300, and 7400 Series - 'Paper Jam: Clear jam, and then press Enter' Message Displays on the Control Panel Display
Issue
During printing, the paper becomes stuck in the all-in-one and the error message 'Paper Jam: Clear jam, and then press Enter' displays on the control panel display.
Solution
Use the following instructions to clear a paper jam from the product:
Step one: Check for and remove any loose paper from the In tray
Do not try to remove jammed paper from the In tray. First remove any loose paper from the In tray to avoid worsening the jam.
CAUTION: Always try to remove jammed paper from the back of the printer first to avoid mechanical damage.
Step two: Clear the jam from the back of the printer
Follow these instructions to clear jammed paper from the back of the product. If the product is equipped with a two-sided printing accessory, skip to that section.
Remove the rear access door to clear the paper jam

1. Remove the rear access door by pressing the buttons on the side of the door and pulling it toward you.
Figure 1: Removing the rear access door
Rear access door
2. Gently pull the jammed paper out of the rollers.
WARNING: If the paper tears while removing it from the rollers, check the rollers and wheels for torn pieces of paper that might remain inside the product. If all the pieces of paper are not removed from the product, more paper jams might occur.
3. Replace the rear access door. Gently push the door into the all-in-one until it snaps firmly into place.

Remove the two-sided printing accessory to clear the paper jam

1. Remove the two-sided printing accessory by pressing in the buttons on the sides and then pulling the accessory toward you.
Figure 2: Removing the two-sided printing accessory
2. Gently remove any jammed paper.
WARNING: If the paper tears while removing it from the rollers, check the rollers and wheels for torn pieces of paper that might remain inside the accessory. If all the pieces of paper are not removed from the accessory, more paper jams might occur.
3. Press the button on top of the two-sided printing accessory to open the door.
Figure 3: Opening the two-sided printing accessory door
4. Gently pull the jammed paper out of the rollers.
5. Close the accessory door.
6. Reinstall the two-sided printing accessory.

Step three: Clear the jam from the automatic document feeder (ADF)

1. Remove the document feeder tray from the product by gently pulling it.
2. Lift the cover of the automatic document feeder by pulling it outward.
Figure 4: Lifting the cover of the automatic document feeder
Automatic document feeder (ADF) door
3. Gently pull the jammed paper out of the rollers.
WARNING: In the rare occurrence of a severe paper jam, you might need to remove the face plate from the front of the automatic document feeder and lift the pick assembly to remove torn pieces of paper from deep inside the automatic document feeder.
4. Close the cover of the automatic document feeder, and then reattach the document feeder tray.

Step four: Verify that the print carriage can move freely
Follow these steps to try to move the print carriage.
CAUTION: Do not force the print carriage to move if it is out of plain view or feels stuck. Forcing it may damage the printer.

1. With the product turned on, open the print cartridge access door. The print carriage might try to move into the access area. If so, allow it to move to that position.
2. Without turning off the product, unplug the power cord from the back of the product. Unplug the power cord from the power source. The power cord must be unplugged to allow the parts to be moved by hand and to reset the paper feed mechanism, without the risk of an electrical shock.
3. Looking in through either the print cartridge access door or the output paper tray, make sure the print cartridges are locked into the carriage and have not come loose. Also, make sure that there are no obstructions under or around the carriage to block it from moving.
4. Make sure the print carriage can move freely across the width of the product by gently pushing the carriage to the left and then to the right. Clear any obstructions found.
You may have to reach through the output paper tray to access the print carriage.
5. Close the print cartridge access door and plug the power cord back to the back of the product. Plug the power cord into the power source.
6. Press the On button to turn on the product.

Step five: Reload and test the printer
After you have removed the jammed paper, make sure the product is still functioning properly.

1. Reload the product with plain paper.
2. Peform a self-test by pressing and holding the RESUME button on the control panel until the product begins printing. A test page prints.

Step six: Service the printer
If you have completed all the steps listed above and are still experiencing a problem, service the product.

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

1. Take out paper tray 1.
2. Remove any jammed sheets of paper you find there.
3. Once you have done this, reinstall the paper tray and try printing again.
   Note: You may receive a message informing you that another sheet of paper is jammed elsewhere in the printer. If so, please open the front door and remove the toner cartridge. Also open the rear door of the printer (and the duplex option if a duplex unit is installed). Remove any and all jammed sheets of paper you find. Then try printing again.
4. If the printer jams again with a 241 Paper Jam error message, look to see if it has tried to feed a sheet of paper out of the tray.
   

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