The camera is working again. I took out the battery, with the the on/off switch, off. I then swtiched the On/Off switch On. I then put the battery in ,and the camera turned on.It then gave me an ERROR 99. I then switch it off and on again, and it is still working.
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There is a small backup battery in the main battery compartment. I believe the XTi uses a CR2016 battery. It provides backup power to maintain the camera's settings when the main battery is removed. Bob Kilbourn www.camerarepairs.com
I think the problem is that these cameras are very sensitive to the battery being taken in and out - if you leave the camera swtiched on, and remove and re-insert the battery, it can cause a very small fuse in the camera to blow. Always ensure the camera is switched to "off" before doing anything with a battery... You can fix it yourself if you are happy disassembling a very delicate piece of hardware!
Hi Take the cameras back to the dealers. Even more so if you are coming to the end of the warranty. This sounds like a hardware fault. The cameras should operate without this sort of hitch and when you get the little red (read/write/power) staying on after you have switched it of and you have not just taking a strings of shots i.e. it is not writing to the card this is normally hardware failure. I had the same sort of thing on a 30D i used to have it turned out to be something which Canon replaced the main circuit board to get it working again.
Try replacing the date/time battery located in the main battery compartment. Also, simultaneously remove the lens. This will be like a master reboot for the camera. Replace the date/time coin battery, the main battery (freshly charged) and lastly the lens.
If this doesn't work, send it in for service. If you are just slightly beyond your one year warranty, Canon may allow a grace period especially if you can provide a receipt. If you can't find a receipt, give them the approximate date of purchase when you send in the camera. You will need to call them or set up service online.
Your camera performs a quick 'integrity' check before each shot and goes into error 99 mode if the lens in incompatible or has a diaphragm problem. ( it will also display e99 if the shutter or flash unit is not ok but this does not apply here ).
This is how you can check whether the diaphragm mechanism is ok : attach lens to your old camera and set camera to AV and set F stop to 16 . open back and release shutter and look through the back to see if your lens is closing to F 16. If it is closing fine then the lens is ok but is not compatible with your D400.