Nikon D3100 Reference Manual page 197

"Clean At"
Choose from the following options:
Option
5 Startup
6 Shutdown
Startup &
7
shutdown
8 Cleaning off
1
Select Clean at.
Display the Clean image sensor menu as
described in Step 2 on the previous page.
Highlight Clean at and press 2.
2
Select an option.
Highlight an option and press J.
D
Image Sensor Cleaning
Using camera controls interrupts image sensor cleaning. Image sensor cleaning may not be
performed at startup if the flash is charging.
Cleaning is performed by vibrating the low-pass filter. If dust can not be fully removed using
the options in the Clean image sensor menu, clean the image sensor manually (0 182) or
consult a Nikon-authorized service representative.
If image sensor cleaning is performed several times in succession, image sensor cleaning
may be temporarily disabled to protect the camera's internal circuitry. Cleaning can be
performed again after a short wait.
The image sensor is automatically cleaned each time the camera is
turned on.
The image sensor is automatically cleaned during shutdown each
time the camera is turned off.
The image sensor is cleaned automatically at startup and at
shutdown.
Automatic image sensor cleaning off.
Description
n
181