Canon EOS 1DS MARK II 9443A009 Instruction Manual (en)

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The CMOS sensor is like the film in a film camera. If any dust or other 
foreign matter adheres to the CMOS sensor, it may show up as a dark 
speck in the pictures you take. To avoid this, follow the procedure below 
to clean the CMOS sensor. Note that the CMOS sensor is very delicate.  
If possible, you should have it cleaned by a Canon Service Center. 
When you want to clean the CMOS sensor, use the DC Coupler Kit to 
power the camera with a household power outlet. If you use the battery, 
make sure it is fully charged. 
Before cleaning the sensor, detach the lens from the camera. 
1
Install the DC Coupler battery and 
turn the <
4
> switch to <
1
>. 
2
Select [Sensor cleaning]. 
¡
Select the <
b
> tab. 
¡
Hold down the <
X
> button and 
turn the <
5
> dial to select [Sensor
cleaning]. Then let go of the <
X
>
button. 
3
Select [OK]. 
¡
Hold down the <
X
> button and 
turn the <
5
> dial to select [OK]. Then 
let go of the <
X
> button. 
s
The LCD monitor will turn off. 
3
Cleaning the CMOS sensor