My Canon MX340 printer says there is a paper jam .... there is no paper jam. I've opened the cover, the scan cover and checked in the back. There is no paper jam. i've tried resetting the printer by turning it off and then on again... Alarm still sounds and says paper jam. Advice?

Removing the covers is not the answer. Most jams on rear feed printers/faxes are due to some object falling in the sheet feeder. When you pull the paper back out (Very slowly) of the sheet feeder after it has jammed , you will see a nick in the paper. This is because the paper is hitting something and cant get past it. put the paper back in the sheet feeder and the nick will indicate where the object is. Find a large paper clip and unwind it and bend the top of it to 90 degrees. use this to hook the object out and then tip the printer upside down and watch it fall out. Good luck

Instructions

1. • 1

     Press down and hold the "On/Off" button, which is located on the printer's operator panel, for one second. Wait 15 seconds and then tap the button again. Attempt to print or scan a document.
     

   • 2

     Check the paper feed tray on the front end of the Canon MX700 to see if there is any paper visibly stuck inside the printer. Open the printer cover by gripping the front edge of the printer and lifting upwards.
     

   • 3

     Grab the edge of the jammed paper and gently pull towards you to remove the paper from the paper feeder. Unplug the Canon's power cable and USB cable, and then turn the printer around.
     

   • 4

     Pull off the rear plastic cover tab and check if there is any visible paper jam. Grab the edge of the paper and gently pull toward you until the paper is removed.
     

   • 5

     Push the rear plastic cover tab back into place, and reconnect the power cable and USB cable. Attempt to print or scan another document to see if the error is resolved.
     

   • 6

     Lift open the printer's cover again and wait for the ink carriage to slide into view. Press the "Push" button on the front of the first ink tank. Pull the tank out and then push it back into place to ensure it is properly seated.
     

   • 7

     Repeat the process with the other three ink tanks, and then close the printer's cover. Power the printer off and then back on again.
     

Hello and Welcome to FixYa!

Paper jam means their may be small bit paper jam in side, actually there are some "micro sensors" that detect a paper jam. There will be tiny piece of paper inside those sensors, thus tripping the sensor and paper jammed keeps coming up.
To solve this first of all Open printer cover and check to make sure no paper or foreign objects obstructing the printer feeder, If you become sure that now really there is no paper, dust or foreign objects then Turn the printer off, and disconnect the AC power-cable. Open the printer cover & now give the printer a "blow-job" by compressed air.
If still problem exist then best & final option is to just contact to any Canon Printers service provider.

I hope this solution helps you
Thank you for using FixYa!

Hi guys,
This error occurs when paper sensor in ADF = Automatic Document Feeder detects some paper inside paper path. Firs, open ADF access cover and check if some broken paper present inside paper path. If no broken paper found in paper path means paper sensor is faulty and you need got new ADF replacement. Thanks

Source:
MX340 Series Service Manual

• 1.
  
• Press down and hold the "On/Off" button, which is located on the printer's operator panel, for one second. Wait 15 seconds and then tap the button again. Attempt to print or scan a document.
  
• 2 Check the paper feed tray on the front end of the Canon MX700 to see if there is any paper visibly stuck inside the printer. Open the printer cover by gripping the front edge of the printer and lifting upwards.
  
• 3 Grab the edge of the jammed paper and gently pull towards you to remove the paper from the paper feeder. Unplug the Canon's power cable and USB cable, and then turn the printer around.
  
• 4 Pull off the rear plastic cover tab and check if there is any visible paper jam. Grab the edge of the paper and gently pull toward you until the paper is removed.
  
• 5 Push the rear plastic cover tab back into place, and reconnect the power cable and USB cable. Attempt to print or scan another document to see if the error is resolved.
  
• 6 Lift open the printer's cover again and wait for the ink carriage to slide into view. Press the "Push" button on the front of the first ink tank. Pull the tank out and then push it back into place to ensure it is properly seated.
  
• 7 Repeat the process with the other three ink tanks, and then close the printer's cover. Power the printer off and then back on again.
  

This error message is displayed by the printer when paper is jammed in one or more locations. In such a case, users are recommended to remove the jammed paper from the specified location. The entire paper path must be checked for any pieces of paper. To stop the message, open and close the top most cover of the printer. Lastly, verify the flags and the sensors. If the problem persists, the cause of the error message could be a broken sensor or sensor lever.

This is either due to a physical error caused by a paper jam, or incorrectly seated ink. To fix:
Press down and hold the "On/Off" button, which is located on the printer's operator panel, for one second. Wait 15 seconds and then tap the button again. Attempt to print or scan a document.
Check the paper feed tray on the front end of the Canon MX700 to see if there is any paper visibly stuck inside the printer. Open the printer cover by gripping the front edge of the printer and lifting upwards.
Grab the edge of the jammed paper and gently pull towards you to remove the paper from the paper feeder. Unplug the Canon's power cable and USB cable, and then turn the printer around.
Pull off the rear plastic cover tab and check if there is any visible paper jam. Grab the edge of the paper and gently pull toward you until the paper is removed.
Push the rear plastic cover tab back into place, and reconnect the power cable and USB cable. Attempt to print or scan another document to see if the error is resolved.
Lift open the printer's cover again and wait for the ink carriage to slide into view. Press the "Push" button on the front of the first ink tank. Pull the tank out and then push it back into place to ensure it is properly seated.
Repeat the process with the other three ink tanks, and then close the printer's cover. Power the printer off and then back on again.

Press down and hold the "On/Off" button, which is located on the printer's operator panel, for one second. Wait 15 seconds and then tap the button again. Attempt to print or scan a document.

Check the paper feed tray on the front end of the Canon to see if there is any paper visibly stuck inside the printer. Open the printer cover by gripping the front edge of the printer and lifting upwards.

Grab the edge of the jammed paper and gently pull towards you to remove the paper from the paper feeder. Unplug the Canon's power cable and USB cable, and then turn the printer around.

Pull off the rear plastic cover tab and check if there is any visible paper jam. Grab the edge of the paper and gently pull toward you until the paper is removed.

Push the rear plastic cover tab back into place, and reconnect the power cable and USB cable. Attempt to print or scan another document to see if the error is resolved.

Lift open the printer's cover again and wait for the ink carriage to slide into view. Press the "Push" button on the front of the first ink tank. Pull the tank out and then push it back into place to ensure it is properly seated

Repeat the process with the other three ink tanks, and then close the printer's cover. Power the printer off and then back on again

Hello my friend,first thing we are going to check is if its a jam inside from a foreign object.So

1. Power the printer off.
   
   
2. Open the paper support and confirm that there is not any foreign material in the auto sheet feeder.
3. Open the scanning unit (printer cover) and confirm that there is not any foreign material in the printer.
   
4. Close the scanning unit (printer cover).
5. Power the printer on and confirm that the printer operates normally.

But in this procedure be very careful and don't push hard anything!

Canon Pixma MX300

- new cartrige for Black ink
- can scan
- can photocopy documents
BUT can't print documents from my MacBook eventhough the paper feeds and goes out at the other side