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This topic comprises 2 pages: 1 2
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Topic: Benchtesting CP50 and CP65
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Michael Schaffer
"Where is the Boardwalk Hotel?"
![](http://www.film-tech.com/ubbmembers/1204d.jpg)
Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 06-03-2007 12:22 PM
But Ken, Luciano siad he did NOT have a working projector or even just sound head available right now. That was the whole point of the post.
As Louis said, testing the B chain related components is easy, and the A cain components can be tested by feeding them a tone from a generator, too. I have never done that, but I believe a level of about 120mV should be appropriate for the projector inputs. However, that needs to be confirmed by somone who has actually done that "on the bench".
But - Luciano, you can not set up the A chain on the bench and then just send the units out for plug and play. Each individual projector and processor combination needs to be aligned. That is the whole point of the A chain alignment process. You do not know how well a projector is aligned until you hook it up to the processor and play the test loops. Even if you know that the projector is well aligned as far as left-right, illumination uniformity, focus and azimuth are concerned, you still need to calibrate the level within the actual setup.
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Luciano Brigite
Master Film Handler
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Posts: 277
From: Sao Paulo, SP, Brazil
Registered: Jan 2002
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posted 06-03-2007 10:47 PM
Hello again,
Steve, thanks for the information regarding the pre-amps output levels and the tip regarding the use of internal Dolby tone generator to reset the CAT64. I could only start the works in one of hte CP50 and already got a busted CAT150, it doesn't surprize me it's the older,dual card version. it's surround channel is popping and hissing almost constantly, with or without signal, it's the last of the dual card CAT150, I believe, since it has the signal leds in it. Also found a few damaged trimpots in one pre-amp card and thoseold,grey,can-type capacitors in the PSU with the usual brow stuff leaked out and dried.a little bit of fun for hte next day's nights. and yes, I have those analog audio AC meters and signal generator Going to use the meter soon on them
And I did notice hte effect Sam mentioned in his post, having the two NR cards in with the signal activated,the center chanel puts out a weird ( to ears) signal and the surrond comes and goes at random. While I'm doing the testing, I'm using a small bech amplifier. will save hte big one for the final testing,so I can really annoy the neightboors
Thanks again!
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