Canon BJC-4200 - Manual (Page 45)

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Follow these guidelines to avoid damage to your printer and harm to you or others:
{ Set the printer on a stable surface. Do not use an angled printer stand. Avoid
setting the printer in direct sunlight.
{ Keep the front cover closed when printing.
{ Do not set anything on top of the printer
{ Make sure the power is off any time you connect or disconnect the AC adapter
or interface cable.
{ Do not unplug the AC adapter unnecessarily.
{ Do not unplug the printer or turn off a power strip to which the printer is
attached when the printer's power is turned on. This may prevent the print
head unit from returning to the home position on the right and being capped,
which may cause the print head to dry out. This is critical. If left uncapped, the
print head unit may clog and may need to be replaced.
{ Do not move the mechanism that holds the BJ cartridge. Attempting to move
the BJ cartridge holder may damage delicate mechanical parts.