Introduced in 2006, the Nikon D40 camera presented a less expensive digital SLR option for amateur photographers. It followed on the success of the Nikon D50, and presented a stripped down and more lightweight version of the D50's features. The D40 was discontinued in 2008, and now the only way to purchase one is second hand. If your D40 begins having problems, you can take a few simple steps to try and resolve the issue before turning to a licensed Nikon repair facility.
Instructions
1. Open the battery compartment door and remove the battery. Replace the D40's battery with a battery that has a full charge. A low battery can cause camera errors such as poor shutter response, incorrect exposure, digital noise and low flash response. The D40 functions best on a fully charged battery.
2. Check the memory card to see if room is left. A camera with a full card will stop responding. Remove the memory card and make sure the write protection switch is in the correct place for your brand of card. Format the memory card, deleting all images, and then replace it in the camera. If you are using a small card, try changing to a smaller image format, such as JPEG Basic, to conserve room on the card.
3. Verify that the lens is attached correctly by removing and re-seating the lens in the lens mount. If it is an older lens, make sure the aperture ring is set to the smallest aperture setting, since any other setting will produce an error message. Older lenses may have reduced functions, such as metering, when being used on a new camera body like the D40.
4. Make sure the lens and internal mirror are clean and free of dust. Dust can cause spots and lines to appear on the final image.
5. Contact an authorized Nikon service center if the troubleshooting steps do not fix the problem. Any further issues should be seen by a professional, since attempting to fix them without training can damage the camera.
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