Dolby Laboratories CP500 Referans Diyagramları - Sayfa 3
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Most projectors sold in North America come with the new reverse scan LED analog
soundhead readers installed. In addition, many existing projectors are being upgraded to
include this superior method of playing back SVA soundtracks. The output of the solar
cell from this system is at a somewhat lower level than a normal incandescent exciter
lamp solar cell. In order to provide the correct signal level for the cinema processor a
small preamp board is needed and is mounted in the soundhead.
Since this is an active circuit it must have its signal ground connected to the cinema
processor ground for correct operation. Failure to connect the board ground to the
cinema processor can result in a noisy optical system or no sound at all. In some
instances the signal ground from the board has been connected to the ground of the
projector; this method should be avoided as it is not the best way to make this connection
The preferred way is to connect the shield at both ends of the signal path. See figure
below:
Proper connection of Reverse Scan
LED Readers to Cinema Processor