Nikon D90 D90 User's Manual - Page 266

❚❚ Manual Cleaning If foreign matter can not be removed from the low-pass filter using the Clean image sensor option in the setup menu (pg. 244), 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 Remove the lens. Turn the camera off and remove the lens. 3 Select Lock mirror up for cleaning. 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). 4 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 lowpass 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. The viewfinder display will turn off and the control panel display will blink. 6 Examine the low-pass filter. n 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. 246