how do I download the BUHL 120 MANUAL, I AM A VOLUNTEER AT MY LOCAL LIBRARY IN PHILA PA teaching English and the Library is allowing me to use their Buhl 120 series projector. It was in a closet not being used. No one seems to know where manual is, best info I got was the bulb may be burned out. No one is sure how it works. Can you help me with an OPERATIONS MANUAL. It would be greatly appreciated. Thank you. pEACE