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Re: Mirror stays up
Check first if there is/not a Mirror lock
Some makes have it.
Failing that it seems there is a mirror mechanism fault.
Establish exactly what you think it is and then onto Canon Tech Support team for their help
you may need to return it to Canon.
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This is a common problem that these cameras came with, its a "glitch" in the motherboard that "turns on" a chip inside of it that pauses or freezes the normal function of the camera and it is triggered by any function/s that use that specific chip. Best thing you can do is to either get another board and install it yourself (if the camera is out of warranty) if not, don't mess with it and send it to Canon for a replacement (not a repair) of the motherboard.
3) Canon had a run of bad motors for this model - if mirror does not go up, then it is the mirror motor. If mirror goes up, shutter will not fire, press release again then the mirror goes down, the shutter motor is bad (same model motor). If mirror goes up, shutter fires, both blades travel together/no exposure, probably the shutter is bad.
The ERR message indicates a camera malfunction. In my D-90 manual it says that it can be cleared by releasing the shutter. The only way to do that is to turn the camera off and back on. Rarely, that won't work and you have to remove and reinstall the battery.
The manual also says that it this have frequently or persist to contact a Nikon authorized service center. I would contact Nikon tech support at www.Nikon.com and discuss the problem them before contacting an authorized service center.
No fault of the camera it's has been programed in custom function #9 for mirror lock up. In mirror kock up mode first click of the shutter button locks up the mirror the second takes the shot and lowers the mirror. Mirror lock up is most often used while tripod mounted for extreme close ups or macro photography and also where a large telephoto lens is used. Mirror lock up is for reducing camera vibration during exposure. You can go into your custom function menu scroll to #9 and turn this off and all will return to normal.
A few suggestions: The mirror lock up function has been activated. The sensor cleaning mode has been activated, doing this the camera as soon as you trip the shutter the mirror will come up and all other functions of the camera are inoperable. the mirror will stay in that position until it runs out of battery or you turn it off. The part you said about having to removing the battery doesn't make scents for this function though. Sensor cleaning is in the Custom Functions. I know you said regardless of lenses and batteries how long do you wait before shutting the camera off and removing the battery? I know that's a question and we aren't suppose to answer a question with a question but the reason I'm asking is that the Canon 40D has a long 30 second shutter speed and a "bulb" setting. It is possible that the camera has been set to "AV" and the shutter is timing out, OR it's been turned to BULB and that mirror will stay there until the camera battery is dead before it drops. Couple things to check out before the next thing I'd think about is the amount of shutter actuation. The Canon 40D has a shutter good for 100,000 clicks/actuation. Sounds like a lot but if you are doing time laps or extended video it's very possible to blow the shutter out of these.
digital cameras do have a "shutter", kind of. IT is electronic, just powers on/of the sensor that captrures the image. Some digital cameras have regular swhutter also, that makes it possible to get real fast shutter speeds for flsh. Take off the lens and look inside, It is possible that the mirror is locked in the up position. Read your owners manual and see if there is a reset button for the camera. Remove the battery, tuen camera on/off switch 2-3 times,replace battery and look again. Try reset switch(if available). My Nikon has a mirror locxk up function available throough its menu. Read your owners manual and see if you have the same. If you can reead menu on LCD, and manual says you have mirror lockup, then try changing settings.
This could be one of a number of problems, but first check the battery contacts are clean. These cameras rely on an elecrtic motor to drive the mirror and prime the shutter. The extra current drawn may cause the voltage to drop if the battery contacts are dirty.
Another possibility is a shutter fault, either the shutter has a sticky deposit or there is an electrical problem. Last time I had one like this I found a crack in the solder connection to the shutter.
Putting a new battery meants the camera will reset to a default setting. This means the shutter will be instructed to fire and the mirror return to it's initial position.
I'm looking for the source of this same problem. I was able to get my d70 unstuck by: 1. Set to full manual mode. 2. In the menus set mirror lock up to yes and then press shutter release. 3. Turn camera off and then back on