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Author Topic: CP45 processor buzzing all of a sudden Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 11-30-2008 11:45 PM                     quote: Bernie Anderson Jr Do you have these problems with Reverse Scans? I have both the BACP RSTR-20 and the CE-40 units and no problems with these two units at all. I did have one Kelmar unit fail, but that was in the power supply unit, not the reader itself along with some of the LED arrays starting to fail. As I mentioned above in an earlier post where my problem was attached to a BACP reader, which was the wiring connections, the readers themselves are absolutely bulletproof when they come to having problems. I'd fully recommend replacment to reverse scan readers if budget conditions allow. -Monte  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 12-01-2008 09:04 AM                     quote: Bernie Anderson Jr I had the new cell wired outside of the projector as a test before I installed it, and it had no buzz at that point. The minute I put it in the projector, I get the buzz back. THIS....is a very important piece of evidence. This would tell me that the projector sound head is introducing the buzz. Additionally...you said that the projector sound head had a ground connection from the CP45 to the head. Perhaps you could try using a 14g or heavier wire to connect the sound head frame to the rear spade ground terminal of the CP45 (just a temporary loose wire). In combination with that, you could try lifting the ground on the audio wire on the processor side first, then reattach. Then try lifting the audio wire ground on the sound head side.  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 12-02-2008 02:15 PM                     I too believe that you should change to a BACP one. It rocks!  |  IP: Logged Bernie Anderson Jr Master Film Handler Posts: 435 From: Woodbridge, New Jersey Registered: Apr 2000 posted 12-03-2008 04:52 PM                        I think I got it figured out. I talked to a friend about it. The first thing he asked was if the solar cell wire is in its own conduit. It is. He asked if the water tight tube that goes from the wall to the projector was metal lined. It wasn't, the original one was just rubber. He suggest that I replace it with a metal lined tube and ground the conduit to earth ground, this way the whole separate conduit would act as an extra shield for the solar cell. The way he explained it is, the jaxlite and wire were acting as a big antenna and picking up everything and amplifying it. I changed out the tubing, the buzz was gone, quiet, but I was still getting pops whenever a switch was thrown or the masking moved. I now grounded the Processor to an earth ground (in the past, that would make it worse), I made sure that the shield connections to the projector and the processor were tight. That seems to have done it. I don't hear any buzzes or pops anymore. I'll run something else tomorrow to see if its still good. But what I can't understand is, why would it change so drastically after all these years?  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 12-03-2008 05:10 PM                     Well, a ground reference changed. Maybe someone else in your building installed a new piece of equipment. Maybe your neighbors drove a new ground rod. Maybe somebody nearby started drawing a lot more current through the ground. Maybe it rained and the soil resistivity changed. Maybe the power company changed out an upstream transformer. Or maybe someone fired up a new radio station (or swapped out an antenna with a different pattern), or a TV station added a new DTV transmitter in anticipation of Feb, 2009. --jhawk  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 12-04-2008 12:53 PM                     Good job figuring it out Bernie. It looks like my advice was a little astray. The solution has also provided valuable information for those who may have a similar problem in the future.  |  IP: Logged

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