Canon BJC 7000 - Manual (Page 69)

Identifying Your Printer Problem
Before contacting Canon, identify your printer problem and make sure you have
the following information:
o Product name
o Serial number
o Place of purchase
o Nature of problem
o 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.
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.