Canon S 820 User Manual page 133

White Streaks
Print the nozzle check pattern to check the ink output.
If a specific color does not print in the nozzle check pattern, clean the printhead.
The problem can also be resolved by aligning the printhead. For details on printhead
alignment, refer to
Printing the Nozzle Check Pattern
Printhead Cleaning
"Straight Lines are Misaligned".
Print Quality is Poor or Contains Errors
Troubleshooting
133