Canon multipass c3000 Service Manual (en)

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5.
Check whether cleaning corrected the problem by printing or
copying a document.
6.
If necessary, repeat this procedure up to four more times (giving five
cleanings in all). If the problem persists after this, install a new BJ
cartridge. See “Replacing the BJ Cartridge”.
When to Replace the BJ Cartridge
How frequently you need to replace your C3000’s BJ cartridge or one of
its ink tanks depends on how you use your C3000. If you print a good
deal of graphics, halftones, or grayscales, you will need to replace the
cartridge more often than if you print mainly text. (See pages A-4 and 
A-5 for details on the life expectancy of BJ cartridges.)
To help ensure the maximum life for your cartridges, always follow the
guidelines for cartridge maintenance given in “Guidelines for Using and
Maintaining BJ Cartridges”.
In general, you will need to replace the BJ cartridge in the following
situations:
If you have been using a BC-21 Color BJ cartridge for over six
months or the BC-20 Black BJ cartridge for over a year.
If your printed output is not crisp and clear or has gaps in the
characters (missing dots), even after you have cleaned the print head
five times as described above.
If your color printouts appear to be missing a color, even after you
have cleaned the print head five times as described above.
IB7-5