Nikon D1 Manual page 126

4 Holding the camera so that light falls on the low-
pass filter, examine it for dust or dirt. If you should
find a foreign object on the filter, have it cleaned at
a Nikon-authorized service center or clean it yourself
as described below. If there is no dirt on the filter,
hold the button down and turn the main
command dial to select Custom Setting 8, then turn the sub-command dial
to select option 0. The mirror will return to the down position and the shutter
curtain will close.
Cleaning the filter
1 Raise the camera mirror as described in steps 1–3 of "How to tell when the
filter needs cleaning (II)." Note that the EH-4 AC adapter (available
separately) is required to perform this operation; if you do not have an AC
adapter, you will need to take the camera to a Nikon-authorized service
center for cleaning.
2 Remove dirt and dust from the filter with a blower.
Do not use a blower-brush, as the brush bristles
can damage the filter. If you are using an aerosol
blower, hold the can upright to prevent liquid from
the blower falling on the filter. Dirt that can not be
removed with a blower can only be removed by
Nikon-authorized service personnel.
circumstances should you touch or wipe the filter.
3
Keeping the button held down, turn the main command dial to select
Custom Setting 8, then turn the sub-command dial to select option 0. The
mirror will return to the down position and the shutter curtain will close.
4 Turn the camera off and replace the lens or body cover, then unplug the AC
adapter.
Technical Notes: Cleaning the CCD
Under no
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