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Author
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Topic: CP-750 Analog Input Wiring
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Jim Cassedy
Phenomenal Film Handler
![](http://www.film-tech.com/ubbmembers/4115a.jpg)
Posts: 1661
From: San Francisco, CA
Registered: Dec 2006
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posted 08-21-2013 10:07 AM
I wasn't sure if this should go in the FILM or DIGITAL forum, so I tossed a coin . . . . . . . and it wound up here:
I've got a situation where a theater wants to get their 35mm projector running again. (D'oh! I KNEW this was going to happen! I've been getting a lot of these requests lately.)
Fortunately, the digital installers did not follow the "scorched earth" digital conversion policy I've seen so many times here in CA.
I'll deal with getting the projectorthingy running again, but my question has to do with resurrecting the audio. The audio chain is intact from the 35 projector to their old CP-45.
I was thinking I could come off the outputs of the '45 and go into the 25pin analog input on the back of the CP-750. I've already made up the neccessary cable & tested it yesterday. I was able to get sound. . . sort of. Of course the EQ and levels were all over the place, and as I walked around the auditorium I could here severe 'phasing'.
When I got home, I double checked the CP-750 documentation, and it appears that the pin-out for the analog input connector is shown differently on two different pages.
Here's one diagram (slightly re-formatted to fit here). Page 15, Fig 2.2 ![-](http://www.film-tech.com/uploads/uploads0503/CP750InptCnctr.JPG)
But, on Page 69, Table 7.8 below shows totally different pin-ous: ![-](http://www.film-tech.com/uploads/uploads0503/25pinChrt_1.jpg)
Also, is it me, or does one diagram seem to show single-ended and the diagram other balanced connections? WHICH ONE IS CORRECT ?
(Fortunately, I used a crimp-pin DB-25 instead of the solder connection one Dolby supplies with the '750 so re-arranging the pins won't be too difficult! )
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