Canon FORMULA CR-50 Operation & Maintenance Manual page 17

3
Remove the ink cartridge.
For more information, see "Replacing the Ink Cartridge" on p. 18.
4
Use a dry cotton swab to wipe off any ink on the ink jet
nozzle.
If the text still appear faint after this operation, replace the ink
cartridge (See "Replacing the Ink Cartridge" on p. 18.)
5
Set the ink cartridge.
For more information, see "Replacing the Ink Cartridge" on p. 18.
6
Carefully replace the Imprinter Cover.
7
Gently close the Maintenance Cover until it clicks into
place.
17