Won't print. Error message Paper empty letter in

Sounds like someone requested A4 size paper in a print job instead of the normal Letter size paper...
Try putting regular letter size paper in the bypass tray and then set it up as A4 size...the print job should then print out on that paper.

Error description:

The Attention (red) light is blinking. There are six possible causes that will display the Attention light pattern:

-Paper out
-Door open
-Print cartridge missing
-Paper jam
-Paper sensor jammed
-Duplexer error

Solution :
After the cause of the problem has been addressed, pressing GO will cause the printer to attempt to recover from the cause of the error. If the printer is unsuccessful, it will continue to display the Attention message until the cause is remedied.

Pressing JOB CANCEL will cancel the print job and the printer will return to the Ready state (Ready light on) unless there is a paper jam still in the printer or the print cartridge is not in the printer.

For more details visit the link below :

Resolve Printer issue

You are most likely getting this message because of a paper size mis-match. For example, you are sending a print job as letter size but your printer is set to or has a4 size installed. When the printer sees that the print job is not a matched size to the paper in the tray, it will look to the manual feed tray for paper to print on, hopefully the correct size. Make sure your paper setting in printer properties on your computer match the paper in the printer and the print job "page setup" is also the same size/

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check the paper type and the paper size from the printer menu, if it is ok then you will try to check the paper sensor on tray 2

Error messages displayed on the LCD and how to handle them
When an error has occurred in the printer, the error / check message is displayed on the LCD.
Take the appropriate action to return to the normal condition.
Error / Check message How to correct CHECK INK
U041 An ink cartridge is empty.
To cancel printing, press the Stop/Reset button.
To continue printing, press the OK button.
After the printing finishes, replace the empty ink cartridge.
Printing with an empty ink cartridge may cause printer malfunction. U051 / U052
U053 / U059 The ink cartridge may not be set properly, or an ink cartridge not supported by the printer is installed.
Install the proper ink cartridge.

Make sure to install both the ink cartridges even when you set the printer to use only one ink cartridge (Color or Photo) in printing.
If one of the ink cartridges is missing, this error will occur. U075 / U076 The ink cartridges are not installed in the proper position.
Install each ink cartridge in the proper position. U140 An ink cartridge not supported by the printer is installed.
Install the proper ink cartridge. U161 / U162 A used ink cartridge may be installed, or the ink cartridge may be empty.
Replace the ink cartridge.

By pressing the OK button, printing can be done without replacing the ink cartridge. However, the remaining ink amount cannot be detected properly, so the function to detect the remaining ink amount does not operate. READ/WRITE MODE Since the memory card is currently write-enabled, printing is not possible.
Set READ-ONLY MODE ON. NO PHOTOS ON CARD Some images in the memory card may not be in a supported format. images listed below cannot be printed directly from a memory card. Print them from a computer.

- images edited on the computer
- images in a format other than JPEG or TIFF
- images with double-byte characters used in the file name
- images saved in a folder nested 4 or more layers deep INCOMPATIBLE CAMERA The printer cannot communicate with the connected camera.
Disconnect the cable between the printer and the camera to clear the error.
Confirm the following items and print again.

1. Confirm that the camera you are using supports PictBridge or Canon Bubble Jet Direct.
If the camera does not support either one, the printer cannot print directly from the camera.
2. Set the camera in PictBridge print mode before it is connected to the machine. This is required before printing for some cameras that support PictBridge.
Please refer to the camera instructions for more information about procedures required before and after connection to the printer.
3. There may have been no response from the camera for the prescribed time.
Re-connect the cable between the camera and the printer. WASTE INK NEAR FULL The waste ink absorber is getting full.
Press the OK button to clear the error.
Printing can be done until the waste ink absorber becomes full. If the waste ink absorber becomes full, please contact your local Service Center for replacement of the absorber and printer maintenance.

The waste ink absorber is a part inside the printer, which absorbs ink used in the cleaning operations, etc. CHECK PRINTER Turn the printer off, and remove the power plug from the outlet.
About ten minutes later, plug it in again, and turn the printer on.
If the problem is not resolved, the printer may require servicing. Please contact your local Service Center. HEAD ALIGNMENT ERROR Automatic print head alignment failed.
Press the OK button to release the error.
Check the followings and do automatic print head alignment again.

- Check if A4/Letter-sized paper is loaded in the auto sheet feeder.
- Check if the paper output slot is not exposed to a strong light source
- Print the nozzle check pattern to check the status of the print head.

If the problem continues, do manual print head alignment. LOAD PAPER If paper is not set, set paper and press the OK button. When paper is set, check each item and do printing again.

1. Confirm that unusable paper is not set.
2. Confirm that paper is set properly.
3. Confirm that recommended paper is used, and the number of sheets set in the auto sheet feeder is within the limit.
4. Cleaning the paper feed roller may resolve the error.

If the problem persists, the printer may require servicing. Please contact your local Service Center. PAPER JAMMED Remove the jammed paper.
If paper jam frequently occurs, check the following:

1. Confirm that no foreign material is inside the printer.
2. Confirm that unusable paper is not set.
3. Confirm that paper is set properly.
4. Confirm that recommended paper is used, and the number of sheets set in the auto sheet feeder is within the limit.

If the problem persists, the printer may require servicing. Please contact your local Service Center.

"MP" tray is refering to the top fold down tray on the front of printer (bypass tray) You might load paper in the bypass and see what it does?

The MP tray referred to is the Multi Purpose tray and is located at the front of the printer. To access it, you need to find the 2 indentations at the side of the front feed assembly and pull them towards you. this then gives access to the MP tray. Don't forget to press the blue button after loading the paper. Your user guide/manual will give clear instructions and pictures. It may also be called manual feed tray. Once loaded with the correct paper press the online button and printing will start.

If this is the first time you have seen this error, do the following:

1. Power off the printer.
2. Remove all installed paper trays.
3. Make sure the paper is loaded correctly in each tray. If it is not, reload the paper into that tray.
4. Look up into the printer where the paper tray slides in and out. Check the feed (autocompensator) assembly for any damage.
5. If everything is fine, reinstall the tray and power on the printer.
6. Try printing a few print jobs.
7. If the error does not return, continue using the printer as before. Keep an eye on it for the next few days. If the error does not return, it may have been an isolated incident.
8. If the error returns just as soon as you power on the printer or when you try to print again, you will need to find out which paper tray/paper source is causing the problem.

• If the printer has only the one integrated paper tray, the problem will be with either the tray 1 pick arm/autocompensator assembly or the printer's engine/system board.
  
• If the printer has more than one paper tray installed, try printing from each paper tray one at a time. The best way to do this is to have all of the paper trays empty and then proceed as follows:
  
1. Put paper in tray 1 only.
2. Print from tray 1.
3. If tray 1 works fine, empty tray 1 and put paper in tray 2 and so on until you encounter the error message.
4. If you receive the error when printing from one particular tray, power off the printer to clear the error.
5. Power the printer back on.
6. Skip the faulty paper feed slot and move on to the next one (if another one is present). If you can print from all but one of the paper trays, this is the source of the problem.
   
   If you have extra paper trays/drawer units installed and the error occurs from only one particular source, there are some things you can do as a temporary fix.
   
• If the error is occurring from an OPTIONAL paper drawer/source, power off the printer and remove the defective drawer from the printer. You will then need to set up the printer to print from a different tray. For information on removing an optional drawer, click here.
• If the error is occurring from the integrated paper tray (tray 1) AND you have optional paper trays installed, take all of the paper out of tray 1 but leave tray 1 installed. Set up the printer to print from one of the other paper tray sources (tray 2, tray 3, multi-purpose feeder, etc.).
7. And if your getting the same error then you need to get it serviced...
   

Test the driver. Go in the properties for the printer and set the number of copies to 4. Try to print a Windows test and and see if you get the same error message. If you do, then the issue is the paper settings in Printing preferences and probably needs to be changed to LETTER paper. If you don't get an error message, the issue is the application you are printing from. Make sure the application is set to letter under printer setup.