I just received this camera from a reputable seller. It was supposed to have had a CLA. Before loading film, I checked that the shutter worked at all speeds. I could see light coming in when it opened. I ran a roll of Arista EDU (Foma) 400 through it and it came out blank except for the frame numbers, etc along the edge. I rechecked the shutter and, again, I could see light coming in when it opened.
I believe that I threaded it correctly, running the film between the first two rollers. Is there something else that I missed?