Nikon D300 User Manual (en)

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Troubleshooting
If the camera fails to function as expected, check the list of 
common problems below before consulting your retailer or Nikon 
representative. Refer to the page numbers in the right-most 
column for more information.
❚❚Display
A
A Note on Electronically-Controlled Cameras
In extremely rare instances, unusual characters may appear in the control 
panel and the camera may stop functioning. In most cases, this 
phenomenon is caused by a strong external static charge. Turn the 
camera off, remove and replace the battery, and turn the camera on 
again, or, if you are using an AC adapter (available separately), disconnect 
and reconnect the adapter and turn the camera on again. In the event of 
continued malfunction, contact your retailer or Nikon-authorized service 
representative. Note that disconnecting the power source as described 
above may result in loss of any data not recorded to the memory card at 
the time the problem occurred. Data already recorded to the card will not 
be affected.
Problem
Solution
Page
Viewfinder is out of focus.
Adjust viewfinder focus or use 
optional diopter adjustment lenses.
43
Viewfinder is dark.
Insert a fully-charged battery.
44
Displays turn off without 
warning.
Choose longer delays for Custom 
Setting c2 ([Auto meter-off delay]) 
or c4 ([Monitor off delay]).
279, 280
Unusual characters 
displayed in control panel.
See “A Note on Electronically-
Controlled Cameras,” below.
383
Displays in control panel 
or viewfinder are 
unresponsive and dim.
The response times and brightness 
of these displays varies with 
temperature.
Fine lines are visible 
around active focus point 
or display turns red when 
focus point is highlighted. 
These phenomena are normal for 
this type of viewfinder and do not 
indicate a malfunction.