Canon PIXMA MP500 Service Manual page 58

4) With the machine turned on in the user mode, press the Menu button. Select Maintenance / Settings,
Maintenance, then Roller cleaning. See "Standalone machine operation," for details.
* Occurrence level:
A: The symptom is likely to occur frequently. (Caution required)
B: The symptom may occur under certain conditions, but likeliness is assumed very low in practical usage.
C: The symptom is unlikely to be recognized by the user, and no practical issues are assumed.
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