Canon BJC-4400 - Manual (Page 86)

5-2 Troubleshooting Chapter 5
Identifying Your Printer Problem
Before contacting Canon, identify your printer problem and make sure
you have the following information:
❍ Product name
❍ Serial number
❍ Place of purchase
❍ Nature of problem
❍ Steps you have taken to solve the problem and the results
The serial number is located on the label on the back of the printer:
N
Attempting to repair the printer yourself may void the limited warranty
as to that repair. See the limited warranty information that came with
your printer for details.