pentaxpete
I was checking the seating if the focus screen as I have had 'back Focus' problems, and got it back all OK then tried firing shutter using the 'manual' 1.60th with the lever with the mirror up then suddenly it all jammed up -- mirror stays UP, shutter will not fire, camera is wound on , delayed action does not work -- battery OK -- took it out and put it back -- any IDEAS what has happened please ?