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Author Topic: CP65 - No optical audio Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 10-03-2010 05:31 PM                        I have a CP65 that is showing plenty of signal activity on the 240A optical preamp card, but no activity on the CAT 150 2:4 decoder card or the fabulous CAT 222SR/A card. If I reboot the processor, I can get a bit of activity, but it is really low. My first thought was the LED. I replaced that, though it is not perfectly aligned since my loops and stuff are at home, but it didn't seem to make a difference. I did notice that the 150 card sometimes lights up in non-sync, that's what made me think "LED". I have no other CP65s to swap cards with. Maybe bad 150 or something askew between 240 and 150 cards?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-03-2010 05:37 PM                     No activity on the Cat 222 eh? Not in any format (mono included)? Look on the back and make sure the Format 22/42 jumpers are all installed correctly (format 22 reading correctly). The Cat 443 could also not be telling things to route correctly.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 10-03-2010 06:38 PM                        No problems found. It works now. Crazy. EDIT: Actually, it had to have been the LED. The symptoms were as I described them originally. Then I changed the LED after the projector had been threaded and cranked down the LED power supply a bit (which was maxed). As the movie was running, I saw no activity on aforementioned cards. But it was playing in DIGITAL. Due to my inability to add 2 and 2 it didn't even occur to me that those do not light in digital mode and I dared not press SR or any other button during the sold-out show. So, nevermind. Problem no more. Now I'll just have to do the a-chain tomorrow.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-04-2010 08:22 PM                     If you happen to have Kelmar scanners check the power supply. They have several types that fail with on again-off again symptoms. You may or may not see a slightly charred molex connector for the LED voltage output on the card or charred parts near the Molex. Mark  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 10-04-2010 09:27 PM                        They are Component Engineering.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 10-04-2010 09:38 PM                        Can't be the LED. You had "plenty of signal" on the input card. Louis  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 10-04-2010 11:17 PM                        Yeah, when I was looking at it when it was playing in digital after I had already replaced the LED. That's when I typed the first post.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 10-05-2010 09:01 PM                        Having format 10 selected wouldn't cause activity on the preamp card (it only registers optical input). Did you go through the usual troubleshooting sequence of - does the power supply provide the correct voltages? - does it work in bypass? - are both the projector 1 and projector 2 inputs dead on both channels? - did you try formats 01, 04, and 05, and did you get anything from any of them? - is there any signal off of the preamp outputs on the back of the processor? ?  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 10-05-2010 09:34 PM                       Scott, I believe you are not correct regarding the optical preamp not showing signal activity when in format 10. The optical preamp is always hot on projector 1 or 2. The analog audio just does not get through as the 242 output card is switched over to pass the external input from the DA20.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 10-05-2010 09:38 PM                        Oops...that's what I meant to say, but I worded my comment poorly. What I was getting at was the idea that anything that a working DA20 and B-chain, but dead LED or solar cell or preamp, would lead to zero activity on the preamp card, regardless of the format selected. Thanks for the clarification.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 10-06-2010 01:33 AM                        Guys, the problem is fixed. It was the LED. Thanks.  |  IP: Logged Manny Knowles "What are these things and WHY are they BLUE???" Posts: 4247 From: Bloomington, IN, USA Registered: Feb 2002 posted 10-06-2010 09:32 AM                     What makes you so sure, Joe? Have you even tried any of these solutions?  |  IP: Logged

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