Canon HC-4200 - Manual (Page 61)

If you installed a new BJ cartridge, the printer automatically cleans the print head.
See page 4-6 for details on manually cleaning the print head.
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the right side of the printer.
{ The printer cleans the print head automatically.

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Whenever you turn off the printer, the BJ cartridge moves to the home position on
the right and caps itself. If you unplug the printer while it is printing (or if you turn
off a power strip to which the printer is connected), or if you manually move the
cartridge holder from the home position, the BJ cartridge will not be capped and it
may dry out.