SD-slot replacement

The most ordinary type of repair - a true "walk-in job," as repair technicians like to say. Just replace a faulty memory card slot: minimal disassembly, a bit of soldering - and the camera is saved. However, even in such a simple repair, there are a few nuances that can easily turn fatal for the camera. Our patient: Nikon D750, which, even without a memory card inserted, shows the "err" message instead of the frame counter. The camera is unusable - the shutter is locked, even if you try to