Canon 7D camera getting error 40 upon battery insertion. what to do?
Tried different batteries with and without battery grip. Cleaned battery contacts.
Are you still having this problem?
Yes I am.
Just to be sure, you have thoroughly cleaned the battery contacts and you are certain the batteries are fully charged.
Yes, cleaned the contacts, and tried 4 different charged batteries that work in my other 7D.
OK. This problem has been quite common with the 7D model. When it is not a matter of clean terminals or bad batteries it is being caused by a week circuit in the power control board of the camera. This board is what regulates power to the parts of the camera and when it does not do it right you get the error 40. The only fix for it is to have the board replaced either by a local shop or, I recommend having Canon do the job. There is a chance Canon will do it without cost but this would depend on how old the camera is.
5 years working on Digital camera's