Rubber belts get old and either hard or gummy. Rubber capstans or rollers have black gunk come off it. That is why at a repair shop they use rubber renue to clean the rubber wheels. They often change the rubber belts to newer ones. The play hear is cleaned from black oxides left on it from decomposing audio tapes. The application of white grease on moving parts including the motor bearings. Also where the batteries used to be is there any acid remains of batteries left in too long. We also used to use contact sprays to clean the invisible oxides inside switches. Remember at 3 or 6 volts dc a fingerprint of oils has so much resistance as to cut the voltages in half. So if you viewed the player in the eyes of a technician... does the player actually look good?
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