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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Re: 40D turns off as I press shutter button
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.
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I recommend that you remove both batteries for ten minutes to get a full reset. you spoke of the main battery. When you open the battery compartment, look at the lower right toward the camera with the LCD facing you. It is a little hard to see, but will say CR2016 3V. Stick your fingernail under the lip and just pull it out. As I said I left both batteries out for about 10 minutes. You will have to re-set the date and time after your done.
Before you send the camera in for repairs,
try this free fix. The problem that you described is frequently battery related. Make
sure that your batteries are the correct type for the camera, and that
they are fresh/fully charged. If the batteries are OK, the problem may be due to corrosion on the contacts inside the camera. Remove
the batteries and wipe the inside contacts firmly with a dry cloth
(heavy corrosion may require cleaning with a wire brush, steel wool, or
sand paper). Remove any residue that may have fallen into the battery
compartment during cleaning, wipe the ends of the batteries, and
replace them in the camera. This cleaning process works about 90% of
the time, and I hope that it cures your problem.
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.
Same problem. Fully charged main battery. In my case, I hadn't used the camera in over 6 months. All I did was pull the main battery and then pulled the small CR 2016 button cell battery located inside the main battery compartment and re-inserted both batteries. The camera made a quiet click and then turned on with the main power switch and asked to reset the date and time. Works fine now. If this doesn't work just purchase a new button cell.