Message on screen, paper jam, then COBOF

With commercial machine like the ImageRunner, it is often staff roughly removing the jammed paper and leaving a tiny piece of torn paper over one of the sensors.

Remove the wall mains plug. Remove all the paper trays. remove the toner cartridge, open all the side doors and look carefully with a flashlight for a small piece of paper.

List of Error Messages - imageRUNNER ADVANCE 400iF 500iF

https://oip.manual.canon > ... > Problem Solving
Error messages are categorized by function. Select the function that corresponds to the displayed error message, and see the possible causes and remedies.

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  Clearing Paper Jams - imageRUNNER ADVANCE 400iF 500iF

  https://oip.manual.canon > ... > Problem Solving
  Follow the instructions on the screen to clear the paper jam. The screen is displayed repeatedly until the paper jam is cleared. If you press [Close], you can ...

To clear the error message Paper Jam after you removed the jammed paper, open and close the scanner cover.
If you still receive the error message, a small piece of paper may be stuck inside your Brother machine.

Refer the below link for the steps to remove any ripped paper remaining inside your Brother machine:

still receive the error message Paper Jam after removed the jammed paper...

My HP 6210 has a paper jam and I don't know how to fix it

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 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.

Hi. The error message shown as paper jam cleared a) not fully b) not carefully and there is any paper fragment or a whole page remained yet. The sensors are perceive the paper in the paper way, so there are any dirty thing or paper fragment. Read again the user manual, section of paper jam carefully and try to clear out again.
Sly

If paper is jammed, a Paper jam message will appear on the control panel display.

Follow these steps to clear the jam:

1. Gently pull any jammed paper out of the output tray or sheet feeder.
   
   
2. If the paper is stuck inside, turn off the Epson Stylus CX.
   
   
3. Open the scanner, remove the jammed paper and torn pieces, close the scanner, and turn the Epson Stylus CX back on.
   
   Note: Be sure to check the far left of the carriage area when checking for jammed paper. Paper that is jammed there may be hidden from view.

If paper jams inside the Automatic Document Feeder, clear the jam as follows:

1. Open the Automatic Document Feeder cover and remove any jammed paper.
   
   
   
   
2. If necessary, lift the document cover and remove any paper that has jammed inside.
   
   
   
   
3. Press OK to clear any messages on the display screen.

If paper is jammed, a Paper jam message will appear on the control panel display.

Follow these steps to clear the jam:

1. Gently pull any jammed paper out of the output tray or sheet feeder.
   
   
2. If the paper is stuck inside, turn off the Epson Stylus CX.
   
   
3. Open the scanner, remove the jammed paper and torn pieces, close the scanner, and turn the Epson Stylus CX back on.
   
   Note: Be sure to check the far left of the carriage area when checking for jammed paper. Paper that is jammed there may be hidden from view.

If paper jams inside the Automatic Document Feeder, clear the jam as follows:

1. Open the Automatic Document Feeder cover and remove any jammed paper.
   
   
   
   
2. If necessary, lift the document cover and remove any paper that has jammed inside.
   
   
   
   
3. Press OK to clear any messages on the display screen.

Look for a small piece of paper that may be stuck in the switch indicating a paper jam.

hi!!!! in your case,try to unplug the power of your printer and check the material that stock inside the printer that can cause the printer paper jam and after you check to plug it back.It is normal when the printer is blinking when the printer is paper jam because that is the error when your printer is paper jam.