Canon 40D - Manual (Page 132)

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3 Manual Sensor CleaningN
While cleaning the sensor, never do any of the following. If the
power is cut off, the shutter will close and the shutter curtains and
image sensor might get damaged.
• Setting the power switch to <2>.
• Opening the battery compartment cover.
• Opening the CF card slot cover.
The surface of the image sensor is extremely delicate. Clean the sensor
with care.
Use a plain blower without any brush attached. A brush can scratch the
sensor.
Do not insert the blower tip inside the camera beyond the lens mount. If
the power is turned off, the shutter will close and the shutter curtains or
reflex mirror might get damaged.
Never use canned air or gas to clean the sensor. The blowing force can
damage the sensor or the spray gas can freeze on the sensor.