Canon Color Bubble Jet BJC-4550 User Manual page 74

The actual amount of ink that you use will vary depending on the print
density of a page. If the majority of your output is graphics, you may
need to change cartridges or tanks more often than when you are
printing text only. See Appendix A, Specifications, for details on the life
expectancy of the BJ cartridges.
You may need to replace the BJ cartridge or an ink tank when any of
the following conditions exist:
You have been using the cartridge for over one year.
Your printed output is not crisp and clear, and there are gaps in the
characters (missing dots) even after you have cleaned the print
head at least five times.
If you are using the BC-21 Color BJ Cartridge and your output is blank,
one of the ink tanks is probably out of ink. See the instructions starting
on page 5-18 for replacing an ink tank.
N
Canon's limited warranty does not cover damage caused to Canon's
Bubble Jet products that is attributable to the use of third-party parts
or supplies, including inks. The limited warranty remains in effect for
its life once that particular damage has been properly repaired.
For optimum printing results, Canon recommends that you use
only the Canon BC-21 Color BJ Cartridge, the Canon BC-20 Black
BJ Cartridge, or the optional BC-22 Photo or BC-29F Neon BJ Cartridge
with your BJC-4550 printer.
When replacing ink tanks in the BC-21 Color BJ Cartridge, Canon
recommends that you use only Canon BCI-21 Color and BCI-21 Black
Ink Tanks.
Chapter 5
Maintaining the Printer
5-9