The problem pertains to the Vivitar 733A super 8 film projector, which has been serviced, but has also been sitting in my closet without proper attention for several months. When I project a roll, and focus for the sharpness thereof, the projector's frame is out of focus - noticeably blurred around the border; - and when I focus for the projector's frame, the film is out of focus. Is the problem mechanical, thus requiring me to have it serviced again, or purchase a new one; or simply the result of my own ignorance? I would be sincerely grateful for any assistance in this matter.
Would that it were so simple!