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Author Topic: Analog Sound Issue Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 12-15-2009 09:39 PM                     Equipment: CP-55 w/Dolby SRA5 QSC USA 900 amps BACP Reverse Scan Soundtrack Reader Problem: There is a constant ticking/popping/tapping sound coming from the stage speakers throughout the entire movie. It is a constant sound like a drum beat. This happens with all movies in this auditorium so damaged film is not the issue. The distortion is not present during intermission/non-sync music. Any help or suggestions would be appreciated!  |  IP: Logged John Wilson Film God Posts: 5438 From: Sydney, Australia. Registered: Dec 1999 posted 12-15-2009 09:41 PM                     Have you tried turning the processor off and on again? Is the ticking in all channels?  |  IP: Logged Ian Parfrey Phenomenal Film Handler Posts: 1049 From: Imbil Australia 26 deg 27' 42.66" S 152 deg 42' 23.40" E Registered: Feb 2009 posted 12-15-2009 11:27 PM                     What's the frequency of the ticking i.e how many ticks per second? Does it coincide with any indicator lights on the processor?  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 12-16-2009 12:45 AM                     Sounds like you got a scanner drum that it has on its corner, a chunk of goo or splice punch hung up on the edge of the drum that is being picked up by optics ..or, you got a nice flat spot on your lateral pad roller on your Simplex (if this is your equipment since you didn't state what you have to run film through in your booth..) soundhead that will cause the thumping.. ...scanner drum bearings are going "bye-bye" ...or even worse, a flat spot on the scanner drum itself. Some areas to look into -Good luck - Monte  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-16-2009 10:07 AM                     If you have no film playing and select SR or A type is it still there if so it is probably a regulator issue  |  IP: Logged Manny Knowles "What are these things and WHY are they BLUE???" Posts: 4247 From: Bloomington, IN, USA Registered: Feb 2002 posted 12-16-2009 12:59 PM                     I had this problem once and it turned out to be a "chunk of goo" on the edge of the drum, as Monte suggests. I'd recommend trying that first since it's super easy to check/fix. I know this will make me sound like a mushy prick, but "Happy Holidays" everyone!  |  IP: Logged Richard Hamilton Phenomenal Film Handler Posts: 1341 From: Evansville, Indiana Registered: Jan 2000 posted 12-16-2009 01:42 PM                     Tom, what soundhead is it? Rick  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 12-16-2009 08:16 PM                     Gordon, Yes the problem is still there with no film playing. So, this obviously has nothing to do with the sound head. What else can I check?  |  IP: Logged Ron Curran Jedi Master Film Handler Posts: 504 From: Springwood NSW Australia Registered: Feb 2006 posted 12-16-2009 11:10 PM                        Try re-seating the cards in the processor. We had such a problem once and pulling the SR cards out and putting them back in cleared it. We now clean the plates or pins on cards as a regular procedure (or when we remember).  |  IP: Logged John Wilson Film God Posts: 5438 From: Sydney, Australia. Registered: Dec 1999 posted 12-17-2009 12:35 AM                     quote: Tom Wienholt So, this obviously has nothing to do with the sound head. What else can I check? quote: John Wilson Have you tried turning the processor off and on again? Is the ticking in all channels? Tom, How about ruling out what's being suggested to you or answering our questions? It may well keep us interested in your plight and end up solving your problem.  |  IP: Logged Michael Voiland Expert Film Handler Posts: 219 From: Naperville, IL US Registered: Aug 2009 posted 12-17-2009 03:03 AM                     With everything on but not running except the scan reader do you hear at hum that sounds like this quote: The link below is just a little video that I whipped up that has a 60htz tone electricity uses 60htz and ground loops can cause a problem. http://www.youtube.com/watch?v=SVZ2P0KsLic if so you have a ground loop in your audio system check for loose ground wires. If it only happens when a motor is running you could be picking up interference on an unshielded conductor. Edited to include description of link and quote tags.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 12-17-2009 04:29 AM                        What kind of LED reader is onboard tht soundhead? Louis  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-17-2009 10:52 AM                     Since it has been determined that the problem is in the optical chain even with no film running I would next disconnect the input to the optical preamp and see if it is still there that will narrow it down to the processor of the LED/Reader The best method of trouble shooting is to break the problem in half so that it will automatically eliminate 1/2 of the possibilities in one pass  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 12-17-2009 11:00 AM                     I was getting a ticking/buzzing from a BACP reader that was missing the little screw that holds the "electronics" in place. (The part with the little handle, under the row of small LED status lights) The card eventually loosened up enough to where some of the contacts inside were just barely seated, so there was intermittent noise caused by any slight vibration- - even just walking across the booth. Re-seating the card and replacing the small screw solved everything. I don't know if this is ths ame problem you're having, but it's worth a look!  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 12-17-2009 02:24 PM                        He said it is a rythmic ticking so it is not ground loop. quote: Tom Wienholt Yes the problem is still there with no film playing. So, this obviously has nothing to do with the sound head. What else can I check? Is it there with the projector motor off? With other motors in the booth off? As Ian suggested, check for electrical equipment that has blinking lights, try to find something that matches the ticks. Do you hear the ticks with the CP55 in MUTE mode? Is it there with the motor off? Is it there  |  IP: Logged

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