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108 Technical Notes/Troubleshooting
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.
A Note on Electronically-Controlled Cameras
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-
ment lenses.
14, 102
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-
sive and dim.
The response times and brightness of the viewfinder
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
card.
4, 12
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
for preset white balance.
Image was not created with D40. 72
Full range of shutter speeds not
available.
Flash in use. 117
Can not select focus area.
• Closest subject selected for AF-area mode: choose
another mode.
• Press shutter-release button halfway to activate
exposure meters.
24
14
Focus does not lock when shutter-
release button is pressed halfway.
Use AE-L/AF-L button to lock focus in AF-C autofocus
mode or when photographing moving subjects in
AF-A mode.
23, 26
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