Nikon D300s - Manual (Page 387)

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❚❚ Manual Cleaning
If foreign matter can not be removed from the low-pass filter using
the
Clean image sensor (0 358) option in the setup menu, 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. If the battery level is below
J
(60%), turn the camera off and insert a fully-charged EN-EL3e
battery or connect an optional EH-5a or EH-5 AC adapter.
2
Select
Lock mirror up for cleaning.
Remove the lens and turn the camera on.
Highlight
Lock mirror up for cleaning in
the setup menu and press 2 (note that
this option is not available at battery
levels of
J or below).
3
Press J.
The message shown at right will be
displayed in the monitor and a row of
dashes will appear in the control panel
and viewfinder. To restore normal
operation without inspecting the low-
pass filter, turn the camera off.