Sony a (alpha) SLT-A55VL - Manual (Page 36)

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If dust or debris enters the camera and lands on the image sensor (the part
that acts as the film), it may appear on the photo image, depending on the
shooting environment. If there is dust on the image sensor, clean the image
sensor following the steps below.
Notes
• Cleaning cannot be performed when the battery level is 50% or less.
• The camera starts beeping if the battery pack becomes low during cleaning. Stop
cleaning immediately and turn the camera off. The use of an AC-PW20 AC Adaptor
(sold separately) is recommended.
• The cleaning should be completed quickly.
• Do not use a spray blower because it may scatter water droplets inside the camera
body.
To clean the image sensor automatically using the cleaning mode of the
camera
Cleaning the image sensor
1
Confirm that the battery is fully charged (page 22).
2
Press the MENU button, then
select
2 with b/B on the
control button.
MENU button
3
Select [Cleaning Mode] with v/V,
then press the center of the
control button.