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Repairing Nikon D3100 Autofocus

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  1. Repairing Nikon D3100 Autofocus, Repairing Nikon D3100 Autofocus: шаг 1, изображение 1 из 3 Repairing Nikon D3100 Autofocus, Repairing Nikon D3100 Autofocus: шаг 1, изображение 2 из 3 Repairing Nikon D3100 Autofocus, Repairing Nikon D3100 Autofocus: шаг 1, изображение 3 из 3
    • The problem is that the autofocus can not adjust correctly. There can be more than one solution.

    • 1. Try forcing the lens to rotate a fraction of a inch. This will sometimes help the problem. Or simply move the switch from M to A on the lens.

    • 2. Try to switching to a single of the 11 auto focus points. Then try if there are specific points that are the problem.

    • This is done by selecting in the menu of your camera to the points. Then focusing on a single object with a background far away. Try focusing on the object then on the background. If this is possible the autofocus point is fine.

    • 3. If all auto focus points are fine, try updating the firmware or cleaning the sensors inside the camera behind the mirror. If a one or more points are out of order, also try cleaning the sensors behind the mirror.

    • 4. Detatch the lens from the camera, by applying pressure on the release button and twisting the lens so it can be released. See picture

    • 5. Set the camera selection wheel to manual (M), see picture

    • 6. Turn the camera on, and start the liveView format. This will flip op the mirror inside the camera.

  2. Repairing Nikon D3100 Autofocus: шаг 2, изображение 1 из 1
    • Take a dry can blower. Or if in lack, use an empty plastic bottle, without moisture inside, and use it to blow on the autofocus sensors.

    • They are located at the bottom under the mirror. NOTE Do not blow with your mouth, small amount of moisture will hit the CCD also located here.

    • Turn the camera off

    • Reattach the lens. Push the lens, white point to white point and turn the lens in place.

    • This worked for me, hope it also helped you ;)


Hope you could use this information

27 участников успешно повторили данное руководство.

Lasse Lorenzen

Участник с: 02/19/13

866 Репутация

Автор 2 руководств

19 Комментариев

wow! good tip, AF appeared broken on my D3100, detach and reattach lens did fix it !!

coleman corrigan - Ответить

My camera fell on the concrete floor 2 times within 10min..thanks to my little devil..the autofocus wasn't working. I was hopeless and thought of contacting nikon service center and the I searched for some repair tips and came across this page..wow. ...it worked for me as well..thank you so much..you saved me a few good bucks for sure..more than that I'm having a trip after a week and wasn't hopeful to get it back..but I'm a happy man now and I'm noy mad at my little angel now :)

Mithlesh Shrivas - Ответить

Hi Mithles Shrivas

Happy to know that it worked :) I know the problem with the small ones, have 3 my self :)

have a nice day :)

Lasse Lorenzen -

Yes!! Thank you so much. The center point of our autofocus wasn't working, and I was worried that the camera would need expensive repair. This did the trick instantly. You just made my day!

Tom Hallman - Ответить

My manual focus does not even work? I guess I have to have it repaired? It just stopped working one day.

Kolby - Ответить

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