So my uncle gave me his old Minolta X700 and a set of lenses, and I took it out to shoot a roll. Everything works excellently, the light meter is spot on, it winds, the seals are all in mint shape. Once I had the roll developed I found every shot I took was cut in half, there simply was only half an image in each frame. I looked at the curtain, and with the back open held it down on the button shutter speed, to find that the curtain only opens half way. I had heard of some transistor malfunctioning and causing the camera to seize operations, but mine still functions, leaving me in doubt about that theory. Any thoughts or wisdom as to how I could fix this or what is wrong with it?