Canon HC-4200 - Manual (Page 54)

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The most important thing you can do to extend the life of your BJC-4200 and to
ensure optimum print quality is take care of the BJ cartridges.
{ If you are using both the BC-21 Color BJ Cartridge and any of the optional BJ
cartridges, make sure you store the cartridge not being used in the BJ
Cartridge Container.
{ Keep BJ cartridges and ink tanks in their sealed containers until you are ready
to use them.
{ Do not remove the ink tanks from the BC-21 Color BJ Cartridge
unnecessarily. This may cause the ink to clog.
{ Make sure both BJ tanks are installed in the BC-21 Color BJ Cartridge.
Attempting to use the BC-21 Color BJ Cartridge with one ink tank only may
cause ink clogging.
{ If spilled, the ink is difficult to remove. Therefore, it's a good idea to keep the
BJ cartridges and ink tanks out of the reach of children.
{ Do not touch the print head area on the BJ cartridge. Ink may leak out and
cause stains.
Spilled ink can stain any surface. Open BJ cartridges and ink tanks carefully, and follow
the guidelines presented here to protect against spilled ink.
Hold the BJ cartridge on the sides only. Do not touch the silver plate on the bottom of
the BJ cartridge or the silver metal or circuit area on the side. The metal area may
become hot during printing.