Nikon D500 User Manual

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If the camera fails to function as expected, check the list of 
common problems below before consulting your retailer or 
Nikon-authorized service representative.
Battery/Display
Troubleshooting
The camera is on but does not respond
: Wait for recording to end. If the 
problem persists, turn the camera off. If the camera does not turn off, 
remove and reinsert the battery or, if you are using an AC adapter, 
disconnect and reconnect the AC adapter. Note that although any data 
currently being recorded will be lost, data that have already been 
recorded will not be affected by removing or disconnecting the power 
source.
Viewfinder is out of focus
: Adjust viewfinder focus (
0 29). If this does not 
correct the problem, select single-servo AF (AF-S
0 101), single-point AF 
(
0 103), and the center focus point (0 108), and then frame a high-
contrast subject in the center focus point and press the shutter-release 
button halfway to focus the camera. With the camera in focus, use the 
diopter adjustment control to bring the subject into clear focus in the 
viewfinder. If necessary, viewfinder focus can be further adjusted using 
optional corrective lenses (
Viewfinder is dark
: Insert a fully-charged battery (
Displays turn off without warning
: Choose longer delays for Custom Setting 
c2 (Standby timer) or c4 (Monitor off delay) (
Displays in control panel or viewfinder are unresponsive and dim
: The response 
times and brightness of these displays vary with temperature.