Canon i560 prints a black smudge pattern on left side of page

this is possibly a problem in the fuseing part of your machine, where the paper heats up at the back, the fuser roller could be worn out. and your toner could be sticking to it.

change the black ink cartridge

Hello you can try this may do it

1. Turn off Canon i550, i560, i850, i860, i865, i9100, i9950 Printers
2. Hold down Resume button and press Power button.
3. Keep holding down Power button and let Resume button go.
4. Press Resume button 2 times then let BOTH buttons go.
5. Green lights will flash and then stop blinking.
6. When green lights are solid, press the Resume button 4 times.
7. Press the Power button and the printer should turn off, if not, press the Power button once more.
8. Your Canon i550, i560, i850, i860, i865, i9100, i9950 Printers should respond as normal.

Please all I ask is call back and just gave a vote, it will gave me some satisfaction to know am helping some one, so I will keep on helping.
All The Best: Pineworks

check the fusing unit in the rear of the printer and check your print cartridge for smudges.

it only shows that your printer is working,the problem is in you pc,reinstall the printer driver where it doenst print correctly then reinstall it.

It's likely that the foam pads that the print head rests on when the printer is not in use are saturated with ink. They're to the right as you look into the printer: a rectangular one for black ink and a square one for the colored ink. If you power the printer off and back on, with the cover open, you'll see where the printhead goes to rest.

The pads aren't easy to get at, but you can blot them with a paper towel. Gummy, half-dried ink dissolves in rubbing alcohol, and you can soak a paper towel or a cotton ball with alcohol and wipe down the area. I've had good luck soaking the pads with alcohol, then blotting them dry with a rag.

There sounds like there is somthing in the path of the printhead. Using a flash light, remove back cover of machine and look for a small piece of paper,etc. Be careful not to jam anything in to th machine. It may take running a thick piece of paper through manually with your hands to remove the object.

Print Nozzle Check Pattern

1. Press the Open button to open the output tray.
   
   
   
   
2. Load letter-sized plain paper in the auto sheet feeder (ASF) or the cassette.
   
   
3. Display the Maintenance screen on the printer.
   
   
4. Press the up or down cursor to select [Nozzle check], then press the <OK>.
   
   
   
   
5. Press the up or down cursor to select [Yes], then press <OK>. (The nozzle check pattern is printed.)
   
   
6. Confirm the nozzle check pattern.
   

< 1 > The normal nozzle check pattern
< 2 > The abnormal nozzle check pattern

< 3 > Some black ink lines are broken.

< 4 > White lines are present in the color ink pattern.

< 5 > Both black and color inks are not present.
Note:

1. When all patterns are printed normally, press the up / down cursor button to select "All A" and press the OK button.
   
   
2. When any patterns are printed abnormally, press the up / down cursor button to select "Also B" and press the OK button.
   

Print Head Cleaning:

1. Display the Maintenance screen on the printer.
   
   
2. Press the up or down cursor to select [Cleaning], then press <OK>.
   
   
   
   
3. Press the up or down cursor to select [Yes], then press <OK> to start print head cleaning.
   
   Note:
   Do not do any other operations until print head cleaning is completed.
   
   
   
4. Print the nozzle check pattern and check the print head status.
   

Deep (Print Head) cleaning:

1. Display the Maintenance screen.
   
   
2. Press the up or down cursor to select [Deep cleaning], then press <OK>.
   
   
   
   
3. Press the up or down cursor to select [Yes], then press <OK> to start print head deep cleaning.
   
   Note:
   Do not do any other operations until print head deep cleaning is completed.
   
   
   
4. Print the nozzle check pattern and check the print head status.
   
   Note:
   Ifthe printed result does not improve even after doing print head deepcleaning, turn off the printer. Then, after 24 hours or later, do printhead deep cleaning again. (After a given time interval, ink coulddissolve itself, resulting in ink unclogging.
   
   

The Canon i560 has a manual duplex feature--in other words, once the printer prints one side (ie. odd pages), it will instruct you to turn the paper around in the correct position and reinsert to print the back side (ie even pages.)

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I have now found the solution elsewhere in the internet: black text only prints on the Canon i560 if selct "normal paper", but not,for instance, if you have "professional photo-paper" selected.