Canon EOS 1D Mark II N Instruction Manual page 49

During the sensor cleaning, never do any of the following that
would turn off the power. If the power is cut off, the shutter will
close and it may damage the shutter curtains and image sensor.
• Turn the <4> switch to <2>.
• Open the memory card slot cover.
• Remove the battery.
The surface of the image sensor is extremely delicate. Be very careful
when cleaning the sensor.
Be sure not to turn off the camera while cleaning the image sensor. If the
power is turned off, the shutter will close and the shutter curtains might
be damaged.
Use a blower not attached with a brush. A brush can scratch the sensor.
Do not insert the blower tip inside the camera beyond the lens mount. If
the power goes out, the shutter curtains will close and the blower tip may
damage then.
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.
If you cannot remove all of the dust, consult a Canon Service Center.
5
Clean the image sensor.
Use a rubber blower to carefully blow
away any dust, etc., on the surface of
the image sensor.
6
Exit the sensor cleaning.
Turn the <
The camera will turn off, the shutter
will close, and the mirror will go back
down.
Set the <
camera will be ready to shoot.
3 Cleaning the CMOS sensor
4
> switch to <
4 1
> switch to <
2
>.
>. The
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