11-24-2018 06:22 PM
11-24-2018 06:39 PM
11-25-2018 09:58 AM
I finally got an error code: 40, I don't know if I didn't notice I previously or if it just started showing up
Error Code 40 is a power malfunction has been detected. Are you using genuine Canon batteries?
Have you tried to power up the camera without a memory card? Without a lens? Without either?
11-25-2018 01:26 PM
Err 40 is a fairly generic "power issue" that can be set by many different failures and problems.
Flipping the mirror in a DSLR is a fairly significant peak power drain task so a problem with the battery or the contact interface between the battery and the camera can easily be an issue causing this error to occur when a sudden increase in battery current is demanded causing system voltage to drop below the critical level.
I haven't used a 7D series but do you have an AC adapter for it and how does it connect? If possible try the AC adapter to narrow down the issue. The aperture is also being changed at the moment the image is taken so try setting it up in Av or manual mode with the selected lens aperture set to the maximum opening of the lens (which is used during setup/focusing).
If replacing the battery or cleaning the contacts doesn't do it then you are going to have to send it in for repair. It is possible that the mechanism used to flip the mirror out of the image path is defective causing it to draw excessive current but more likely there is an issue either with the power bus or power bus sensing circuit on the main board.
11-25-2018 02:01 PM
11-25-2018 02:10 PM