How to Troubleshoot Canon Printers


Posted by Richerd Wilson | Posted in , | Posted on 2:27 AM

If you are having trouble getting your Canon printer to print properly or even turn on at all you don't have to immediately resort to returning it or taking it to an electronics repair facility. There are several different troubleshooting steps you can follow on your own and in conjunction with Canon's printing software to get your printer back in operating condition quickly.


See if your Canon printer has its indicator lights flashing in a specific pattern and then consult your manual to see if there is a corresponding error code. Follow the instructions in the manual for how to fix the associated problem, or continue on with more troubleshooting if it isn't displaying a specific error code.
Make sure the power cord is plugged into your wall outlet and the USB cable is firmly connected to your computer. Open the top of the printer and do a quick visual inspection to see if there is a piece of paper stuck in the paper feed.
Restart your computer and attempt to print off something new in case the computer has stopped recognizing your printer or the print queue has stopped responding due to a software error.
Navigate to your computer's "Control Panel" and click on the "Printers and Faxes" option. Click on the "Add A Printer" button if your Canon printer isn't showing up in the list. Follow the on-screen instructions so that your computer will run a test to try to detect the printer.
Try uninstalling and re-installing the Canon software that came with your printer and then navigate your Web browser to their official Web page and download the most recent version of the software driver.
Open the Canon printer software and choose the "Properties" or "Options" tab. Click on the option to "Test Alignment" or "Clean Print Heads," depending on which version of the software you are using. Wait for the printer to finish its alignment and then print off a test page. Check to see if the test page printed properly and then contact Canon for repair or replacement options if it still isn't working properly.

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How to fix printers not working in OS X 10.6.8


Posted by Richerd Wilson | Posted in | Posted on 3:03 AM

After OS X 10.6.8 was released last Thursday, a number of people found that their printers were no longer printing, where the system would show the printers in a paused state and no print jobs would work. This problem seems to behave differently for different setups, but overall appears to be a bug with how CUPS handles its backend processes.

The back end in the CUPS system is the interface for various transmission protocols for both networking and direct connections to the printer. While some people may benefit from the aforementioned fixes of running general maintenance, resetting the print system, and reapplying the latest "Combo" updater, it appears a true workaround until Apple addresses the problem is to replace the transmission protocol file you are using with the one from OS X 10.6.7.

In order to do this, you will need your Time Machine backups or another Mac running OS X 10.6.7 and then run the following procedure:

Go to Folder

Use the Finder's "Go to Folder" option to 
open the hidden "backend" folder
  1. In the Finder's "Go" menu select "Go to Folder"
  2. Type "/usr/libexec/cups/backend" in the field and press enter to go to the hidden "backend" folder.
  3. Open the "Console" utility to see what backend file is being used. When your print job fails you should see a message similar to the following (in this case it is the "lpd" backend):

    printer-state-message="/usr/libexec/cups/backend/lpd failed

  4. In the Finder with the "backend" folder window open, invoke Time Machine and then go back to before you updated OS X (sometime on June 23 should work) and restore the file, replacing the one in the "backend" folder. If you do not have Time Machine, you can copy the file from the same location on another Mac.
  5. Close the Finder window and then perform a Permissions Fix on the boot drive using Disk Utility.
  6. Go to the "Print & Fax" system preferences, right-click the printer list and reset the print system, and then set up your printers again.

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