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Author
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Topic: Dolby Digital reader failing
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Tony Bandiera Jr
Film God
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Posts: 3067
From: Moreland Idaho
Registered: Apr 2004
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posted 08-09-2012 03:47 PM
Randy is very close but there are some errors with his statements. A problem with the upper feed sprocket generally won't affect the whole projector's stability, and it often won't make noises.
It is a good place to look first, make sure there are no missing teeth on the fiber gear, make sure the sprocket itself is tight on the shaft (the nut in the center isn't loose) and that there is no excessive play. (Check with the projector off, try to turn the sprocket back and forth by hand. Any more than just a tiny amount (about 1/8th of a sprocket tooth) of play is excessive.
But the upshot is that the projector is most likely not running smoothly. Some areas to look at:
If it's an older SH-1000 type soundhead, the intermediate drive gear between the projector and soundhead, loose, worn out or broken free of the bearings; internal bronze gears bad, bad motor coupling.
If a 5-Star (belt drive), bad belts (missing teeth or loose); bad bearings in the sprocket shaft of the soundhead; loose drive pulleys (the setscrews are notorious for loosening up and making the drive pulleys sloppy on the shaft..to check, hold the soundhead sprocket with your hand and try to turn the motor flywheel by hand, any slop is not acceptable). Loose pulley or flywheel on the motor.
Either type of soundhead: Bad motor (shorted windings, bearings, etc.) loose electrical connection to motor or bad contacts on motor relay in automation or switch.
Any of the above can cause vibrations/speed irregularities which will translate into vertical jitter.
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