Canon MARK IV User Manual (en)

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Whenever you set the power switch to <1/J> or <2>, the Self Cleaning 
Sensor Unit operates to automatically shake off any dust on the front of the 
sensor. Normally, you need not pay attention to this operation. However, you 
can execute the sensor cleaning at anytime as well as disable it.
1
Select [Sensor cleaning].
 
Under the [7] tab, select [Sensor 
cleaning
], then press <0>.
2
Select [Clean nowf].
 
Turn the <5> dial to select [Clean 
now
f], then press <0>.
3
Select [OK].
 
Turn the <5> dial to select [OK], 
then press <0>.
X
During the sensor cleaning, the 
<
f
> icon will be displayed on the 
LCD monitor. When the cleaning 
ends, the screen will return to step 2.
 
In step 2, select [Auto cleaningf] and set it to [Disable].
X
The sensor cleaning will no longer be executed when you set the 
power switch to <1/J> or <2>.
f
 Automatic Sensor Cleaning
Cleaning the Sensor Now
Disabling Automatic Sensor Cleaning
 
During the sensor cleaning, the shutter will make three shutter-release 
sounds. The camera is not taking pictures.
 
For best results, do the sensor cleaning while the camera bottom is 
placed on a table or other flat surface.
 
Even if you repeat the sensor cleaning, the result will not improve that 
much. Right after the sensor cleaning is finished, the [Clean nowf] 
option will remain disabled temporarily.
COP
Y