Nikon D750 DSLR Camera (Body Only) - Manual (Page 479)

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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
( 0 448), 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 battery or connect an optional AC adapter and
power connector. The
Lock mirror up for cleaning option is
only available in the setup menu at battery levels over J .
2
Remove the lens.
Turn the camera off and remove the lens.
3
Select Lock mirror up for cleaning .
Highlight Lock mirror up for
cleaning in the setup menu and press
2 .