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Author Topic: Benchtesting CP50 and CP65 Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 06-04-2007 05:05 AM                     What Sam said from another topic (http://www.film-tech.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=001326#000000): "The best way according to me is to set the input trims all the way off and set each output trim to about 200 mVolts (measured at the input to the VCA card) of pink from a Cat. 85 After setting house EQ, and before setting final sound pressure levels. The method described in various versions of the CP50 manual rely on using test film and this in turn is thrown off by the state of the A chain including SR cards. Setting it from a generator goes around all this." Since we're discussing CP50 territory: Where is PN injected in a Cat560 to Eq the surround channel and set auditorium level? The SW input is also way in the card than its predecessor (160) making things difficult. Should I use backplane pin A1 for the SW and pin A5 for the surround? Christos.  |  IP: Logged Luciano Brigite Master Film Handler Posts: 277 From: Sao Paulo, SP, Brazil Registered: Jan 2002 posted 06-08-2007 12:07 AM                     Hello all, Thanks for the information until now on how to test these 2 CPs. I have another question about the CP65 now. The one I have here and I'm testing right now makes a "pop" in hte sound everytime it's switched from Dolby A to Dolby SR or the opposite. each time it's switched, hte leds on hte CATs 222,150,441 and 242 blinks ( all channels) it happens with signal present or not. Now the processor is doing the same kind of popping while working and this time all the leds mentioned before blinks and the two green leds on hte cat.240A. is it indicating a problem with hte pre-amp card? I also noticed that htese "pops" sometimes follows hte signal being reproduced ( like a hand's clapping,shot,slamming door and the like.) also happens,but not always when a sudden increase of level happens ( like when a loud passage happens all of sudden in hte movie) In case the pre-amp card is at a fault, where I can look for one and have it here in a few days? or what should be replaced on it to solve the popping? is there any schematic of it available? thanks! I forgot to mention one thing: this CP65 is missing the spare pre-amp card. [ 06-08-2007, 11:59 PM: Message edited by: Luciano Brigite ]  |  IP: Logged

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