Nikon 25420 manual Technical Notes/Troubleshooting, Problem Solution, AF-A mode

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.

Problem	Solution
Camera takes time to turn on.	Delete files or folders.	20, 65
Viewfinder is out of focus.	Adjust viewfinder focus or use optional diopter adjust-	14, 102
	ment lenses.
Displays turn off without warning.	Choose a longer auto off delay.	78
Camera stops functioning	See “A Note on Electronically-Controlled Cameras,”	—
	below.
Display in viewfinder is unrespon-	The response times and brightness of the viewfinder	—
sive and dim.	display varies with temperature.
Menu item is not displayed.	Select Full for CSM/Setup menu.	80
Menu item can not be selected.	Rotate mode dial to another setting or insert memory	4, 12
	card.
Image size can not be changed.	Image quality set to RAW or RAW+B.	30
Metering can not be changed.	Autoexposure lock in effect.	46
Can not measure white balance.	Subject is too dark or too bright.	71
Image can not be selected as source	Image was not created with D40.	72
for preset white balance.
Full range of shutter speeds not	Flash in use.	117
available.
	• Closest subject selected for AF-area mode: choose	24
Can not select focus area.	another mode.
	• Press shutter-release button halfway to activate	14
	exposure meters.
Focus does not lock when shutter-	Use AE-L/AF-L button to lock focus in AF-Cautofocus
	mode or when photographing moving subjects in	23, 26
release button is pressed halfway.	AF-A mode.

A Note on Electronically-Controlled Cameras

In extremely rare instances, a strong external static charge may cause the camera may stop functioning. Turn the camera off, remove and replace the battery (note that the battery may be hot) or disconnect and recon- nect the AC adapter, and turn the camera on again. If the problem per- sists, turn the camera off and press the reset switch (see right; note that this resets the clock). In the event of continued malfunction, contact your retailer or a Nikon-authorized service representative.

Reset switch

Connector cover

108 Technical Notes/Troubleshooting