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Optical sound troubleshooting: Difference between revisions
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'''Shrunken Optical Soundtrack''': Print is shrunken and not aligned laterally in the soundhead. As with soundtrack damage, part of the track can be blocked off with a business card. The lateral guide roller can also be adjusted to the shrunken film, but must be set back afterwards. Consult your projector's manual for this adjustment. | '''Shrunken Optical Soundtrack''': Print is shrunken and not aligned laterally in the soundhead. As with soundtrack damage, part of the track can be blocked off with a business card. The lateral guide roller can also be adjusted to the shrunken film, but must be set back afterwards. Consult your projector's manual for this adjustment. | ||
=Distortion= | |||
One of the most common types of distortion in optical sound is the distortion of sibilant sounds (s, sh), which can be very apparent in dialog. This can be caused by playing a film in the incorrect sound format (most notably playing an A type film in SR). | |||
=Wow & Flutter= | =Wow & Flutter= | ||
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-Stuck sound drum. Sound drum may not be spinning at all, putting resistance on the film and causing audible flutter. A stuck sound drum will also cause severe film scratching, unfortunately not visible on screen until the print is run again. It is a good idea to check that the sound drum is spinning freely during the process of threading the projector (note that some projectors have an electronically or mechanically coupled sound drum which does not turn until the projector is in motion). | -Stuck sound drum. Sound drum may not be spinning at all, putting resistance on the film and causing audible flutter. A stuck sound drum will also cause severe film scratching, unfortunately not visible on screen until the print is run again. It is a good idea to check that the sound drum is spinning freely during the process of threading the projector (note that some projectors have an electronically or mechanically coupled sound drum which does not turn until the projector is in motion). | ||
-Screw holding sound drum flywheel onto sound drum shaft has become loose or fallen out entirely, causing sound drum, flywheel, and film to all spin at different speeds. | |||
-Worn sound head rollers. Sound head rollers or rubber O rings may be disintegrating or have worn a flat spot, causing the film to advance at a slightly different speed at every revolution. Such rollers should be replaced. TIP: If projector has a rubber roller in the sound head and is not used regularly, put a piece of felt between the roller and sound drum so it doesn't wear a flat spot. | -Worn sound head rollers. Sound head rollers or rubber O rings may be disintegrating or have worn a flat spot, causing the film to advance at a slightly different speed at every revolution. Such rollers should be replaced. TIP: If projector has a rubber roller in the sound head and is not used regularly, put a piece of felt between the roller and sound drum so it doesn't wear a flat spot. | ||