Most of these BC errors result in the shutter not firing at all, and no mirror movement. I call this a “sticking shutter magnet”. This can often be fixed with by either tapping the magnet, or putting a strong magnet near it.
It sounds you have a more serious problem with yours.
That sounded like the shutter fired when the mirror went down. I would check the Custom Functions to make sure Mirror Lockup is off. But even if it is enabled, there shouldn’t be a BC error.
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Welcome to Photrio, @brupsilva !
Sorry to hear about the issue with your EOS3. The first thing that comes to mind is a problem with its power supply. The obvious thing to check if a fresh battery or a different brand of battery produced the same problem. If so, then there might be a problem with aging capacitors, resulting in a brownout condition during the shutter sequence.
If the problem is in the electronics (capacitors) there are some hope or not?
Let's hope the batteries make a difference, but I agree that it would be odd that they work fine in one camera and not in another. However, stranger things have happened!
Sort of; firstly, it's a bit of an educated guess on my end, so no guarantees that this is really the problem. And even if it is, the bad news is that it'll be far more difficult to resolve than on the far more simple cameras that are often associated with capacitor problems. These EOS cameras are highly integrated and the electronics are very complex. This means that identification of potentially bad capacitors is already a major challenge, as well as the disassembly involved in it.
All considered, if the batteries don't help, things will likely get very complicated, very quickly.
Check out this YouTube video that shows how to access Error Codes: Checking Error codes on EOS 1
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