Canon S400 User Manual page 17

Working around the printer
Do not use flammable sprays near the printer.
Do not put your hands or fingers in the printer while it is printing.
Do not place metal objects (paper clips, staples, etc.) or containers of flammable solvents
(alcohol, thinners, etc.) on the top of the printer.
Gases in the spray could cause a fire or electric shock if they come
in contact with electrical components inside the printer.
The printer contains moving parts that could cause injury.
Such objects could fall or spill into the printer and cause a fire or
electric shock.
Safety Precautions
Introduction 17