Canon M111021 ユーザーズマニュアル

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Cleaning the Magnetic Heads
If the magnetic heads are dirty, then MICR characters cannot be 
scanned correctly. Periodically, clean the magnetic heads with a 
commercially available audio head cleaner.
1
Pull the Open Button, and pull the Front Maintenance 
Cover open to the right and left.
IMPORTANT
If you notice paper dust in the feed path when you open the 
Maintenance Cover, clean it out with a cotton swab.
2
Use a commercially available audio head cleaner to clean 
the magnetic heads.
The magnetic heads are located in the positions shown in the 
diagram below.
3
Close the Front Maintenance Cover in the order shown in 
the diagram below.
Magnetic 
Heads