I have an RTL 1000, which fires the shutter immediately, does not release the mirror and does not retract the aperture setting pin when wound on. It appears that the winding mechanism is not triggering the reset of these items after the exposure is complete. Shutter timing is fine. If I physically reset the aperture bar and unlock the mirror the camera winds on and fires correctly but then remains stuck in the mode I described. Appreciate any information as to what may be causing this and if possible a copy of the service manual for the camera.