Canon EOS Rebel T3 18-55mm IS II Lens Kit - Manual (Page 173)

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If dust adhere to the image sensor and dust spots appear on the
images, you can clean the image sensor yourself with a camera blower.
The surface of the image sensor is extremely delicate. If the
sensor needs to be cleaned directly, having it done by a Canon
Service Center is recommended.
Before cleaning the sensor, detach the lens from the camera.
1
Select [Clean manually].
Under the [6] tab, select [Clean
manually], then press <
0>.
2
Select [OK].
Select [OK], then press < 0>.
X In a moment, the reflex mirror will
lockup and the shutter will open.
3
Clean the sensor.
4
End the cleaning.
Set the power switch to <2>.
3 Manual Sensor CleaningN
For the power source, using AC Adapter Kit ACK-E10 (sold separately)
is recommended.
If you use a battery, make sure it is fully recharged.
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