Nikon D3000 - Manual (Page 190)

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❚❚Manual Cleaning
If foreign matter can not be removed from the low-pass filter using the Clean image
sensor option in the setup menu (
0 170), the filter can be cleaned manually as
described below. Note, however, that the filter is extremely delicate and easily
damaged. Nikon recommends that the filter be cleaned only by Nikon-authorized
service personnel.
1
Charge the battery or connect an AC adapter.
A reliable power source is required when inspecting or cleaning the low-pass
filter. Turn the camera off and insert a fully-charged EN-EL9a battery or connect
an optional EP-5 power connector and EH-5a AC adapter.
2
Remove the lens.
Turn the camera off and remove the lens.
3
Select Mirror lock-up.
Turn the camera on and press the G
button to display the menus. Highlight
Mirror lock-up in the setup menu and press
2 (note that this option is not available at
battery levels of
H or below).
4
Press J.
The message shown at right will be displayed in the
monitor. To restore normal operation without inspecting
the low-pass filter, turn the camera off.
5
Raise the mirror.
Press the shutter-release button all the way down. The
mirror will be raised and the shutter curtain will open,
revealing the low-pass filter.
6
Examine the low-pass filter.
Holding the camera so that light falls on the low-pass filter,
examine the filter for dust or lint. If no foreign objects are
present, proceed to Step 8.
G button