Question about Canon EOS 40D Digital Camera

2 Answers

40D turns off as I press shutter button

The machines is with the newest firmware 1.1.1 and using a fully charged Canon battery. When I pressed half shutter, it will focus, but when the shutter is fully pressed, the machine just shuts down. It would not open up unless I eject the battery and insert it again. Appreciate for your kind help

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  • axolon May 11, 2010

    I have the same exact behaviour on my 40D since yesterday, after only
    7500 exposures. If you found out more about it in the meantime, please
    share it with us. It would be greatly appreciated!
    Thank you!

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2 Answers

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  • Canon Expert
  • 357 Answers

This is most likely a motor problem. Canon had a quality control problem with the motors for this model, due more than likely to bad quality control at the Chinese plant that manufactured them. There are two identical motors in this (and more recent model Canons). One ***** the shutter, the other moves the mirror up and down. Both also have phase switches that can become 'dirty' because of the excessive grease put in the gears during manufacturing.

The motor(s) freeze, and you get the problem described. If the mirror goes up and then it fails, it is the shutter motor. If the mirror fails to rise, then it is the mirror motor.

A shutter failure can also cause problems, but it runs about three to one that it is a motor failure.

Posted on Apr 30, 2012

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  • 11 Answers

The shutter mechanism had to be replaced. I've heard that this is a typical 40D problem, due to a shutter design flaw. They say that it has been fixed on replacement shutters.

Posted on Jan 30, 2010

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hi
dear ur battery is not working properly replace the battery

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Try the following diagnosis steps: -

To isolate the cause of the issue, do the following: -
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert only a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, the camera may be faulty and requires a service. If it does not, then: -
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -
1. Turn off the camera.
2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.

If the “ERR 99" message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99" with a different Canon lens attached, then the camera is faulty and should be serviced.

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Check this link: www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/

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