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Author Topic: Sound Failure in CP55/analog reader Jeff Lacey Film Handler Posts: 54 From: Canton, MI, USA Registered: Jun 2005 posted 04-10-2006 05:36 PM                     Hi everyone... I have a problem with a CP55. The issue is that the sound will drop out at random times throughout a movie, and sometimes not at all. Bypass mode does not restore the sound either. Nonsync works. I am getting no signal on the preamp card, so I replaced it with two other cards, and still have the same problem. I have also switched out the voltage regulator, with the same results. I am thinking that this is not a problem with the CP55 at all, but is in the Kelmer analog reader, but I wanted to confer with you all to see if there was something else I could check. My next step is to replace the reader with a known working one to see if the problem will follow. Any help you can give me would be greatly appreciated. Thanks!  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 04-10-2006 06:30 PM                        There are many possible causes; try the analogue power supply first (Kelmar). Can you substitute another from another screen? Louis  |  IP: Logged Jeff Lacey Film Handler Posts: 54 From: Canton, MI, USA Registered: Jun 2005 posted 04-10-2006 06:38 PM                     That's my plan right now... The reader is on when we lose sound, so that was why I was thinking it was in the processor at first. Now I am pretty confident that its the reader....  |  IP: Logged Dominic Espinosa Phenomenal Film Handler Posts: 1172 From: Boulder Creek, CA. Registered: Jan 2004 posted 04-11-2006 01:53 AM                     Could be a broken or loose connector/solder connection/wire?  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 04-11-2006 03:26 AM                        Loose wiring sounds like a probably cause. More likely at the reader end because of the vibrations of the projector. There isn't much movement in the sound rack. If you can reproduce the problem, you can play the Dolby tone loop and follow the signal with your multimeter to the processor inputs. Be warned that you can't simply swap the readers. They need to be aligned.  |  IP: Logged Jeff Lacey Film Handler Posts: 54 From: Canton, MI, USA Registered: Jun 2005 posted 04-14-2006 02:56 AM                     Hey... Just a quick update... I switched out the reader's power supply with a known good one. The problem hasn't followed to the new house, and the problem house hasn't had any issues either... Maybe the contacts were just dirty?  |  IP: Logged Jason Miller Expert Film Handler Posts: 241 From: Little Rock, AR, Registered: Mar 2004 posted 04-14-2006 03:39 AM                    If it is the Vanilla colored box with the Green LED ont he front, I have had the same intermittant problem. as soon as I show up to the theatre it seems to be working fine. I have been replacing those older Kelmar power supplies with the new black ones that have LED current adjustment on the front so you dont have to open up the box.  |  IP: Logged

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