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Author Topic: Problem with Dolby CP850 auto mute auto about 5-7 seconds Nguyen Jack Film Handler Posts: 93 From: Singapore Registered: Mar 2013 posted 02-24-2019 10:50 PM                     Hi everyone, I get problem with Dolby CP850, the Cp850 auto mute all channel about 5 - 7 seconds then unmute. Everyone can help and let me know solution to check and fix it. It is using with Christie IMB. Version software: 2.1.0 Thanks.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-25-2019 04:29 AM                     Hello, How do you know it is thew 850 muting the channels and not something else on the chain? Do you see the MUTE button flashing red on the front panel?  |  IP: Logged Nguyen Jack Film Handler Posts: 93 From: Singapore Registered: Mar 2013 posted 02-25-2019 04:38 AM                     Hi Marco, Hello, I see the MUTE button flashing red on the front panel.  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 02-25-2019 09:28 AM                        OK, that's strange! Is the CP850 just playing AES/EBU audio, or Atmos, or something else? Under what circumstances does it do this? Is the CP850 connected to Ethernet so it could get automation commands? I don't remember if the CP850 has logging, but if so, it would be interesting to know what the log says. Good luck! Harold  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 02-25-2019 10:13 AM                     Is the CP 850, AND IMS powered thru a UPS? A momentary power glitch (even one not long enough to interrupt playback or make the projector lamp go out) could cause this problem. If the equipment is on a UPS, when was the last time the battery was changed? (Troubleshooting 101, start with the simple things first.)  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-25-2019 12:34 PM                     I think you should consider have the logs inspected. If the mute button engages, something will be logged in the logs.  |  IP: Logged Nguyen Jack Film Handler Posts: 93 From: Singapore Registered: Mar 2013 posted 02-25-2019 08:51 PM                     Hi Tony, All equipment on UPS. CP850 and Christie IMB installed on November 2016.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 02-26-2019 08:01 AM                     Does this happen on all shows? And how is the CP850 hooked up to the IMB? How are you sending macros? Over IP or over serial? Is there anything connected to the CP850 GPIO?  |  IP: Logged Nguyen Jack Film Handler Posts: 93 From: Singapore Registered: Mar 2013 posted 02-27-2019 03:59 AM                     Hi Marcel, CP850 connect with IMB over IP, use IP for send marco. Don't using GPIO on CP850  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 02-27-2019 07:43 AM                     Did you check your server logs it's not inadvertently sending a MUTE cue to your audio processor? I've seen something similar on a CP650, which would sometimes seemingly randomly switch into mute on all channels. In this case, it was caused by a bad amplifier, which apparently triggered some self-preservation mechanism in the audio processor.  |  IP: Logged Nguyen Jack Film Handler Posts: 93 From: Singapore Registered: Mar 2013 posted 02-27-2019 10:30 PM                     Hi Marcel, The logs file don't see mute cue, I upgraded new software 2.3.1 lastday. Hope will be fix the problem.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-28-2019 04:17 AM                     Did you find anything else in the logs? As the MUTE button engages, I'd expect to see something in the logs to be honest - such as something crashing or similar.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 02-28-2019 04:37 AM                     Well, if the update doesn't fix the problem, try to run it with all amplifiers switched off. Just to make sure it's not the same issue I've once encountered with a CP650.  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 02-28-2019 10:14 AM                        Does the CP850 have a log? If so, it would be interesting to see what's there. Also, is this a new problem on an existing installation, or is it a new installation? Finally, I had a problem with some JSD-100 units muting on loud audio near Las Vegas NV. Looking at Google Maps, I found the problem was worst in the auditoriums that were closest to a cell tower. Going to the site, I tried disconnecting various connections from the JSD-100. It turned out that the problem went away when I disconnected the HI/VI audio cable. At that time, the JSD-100 HI/VI audio went to some ADC inputs on the microcontroller to measure the HI/VI audio output levels. When there was loud audio (including on HI), the RF combined with the audio to force ESD protection diodes in the microcontroller into conduction. This "scrambled" I/O making it look like the mute button was being pushed. In the field, I added series resistor in each of these audio lines at the JSD. Since the input impedance of the IR panel is high, this did not affect the audio. It did, however, drop the RF voltage conducted into the JSD. We then made a hardware and software change in the JSD. We improved the EMI filtering on the HI/VI outputs. We also removed the link back to the microcontroller ADC inputs and, instead, measure the HI/VI levels in the DSP. The JSD-100 measures audio levels (for the front panel bar graph) on the analog audio outputs on the rear panel. The JSD-60, designed later, reduced cost by measuring all audio levels in the DSP. So, long story short, is it possible an RF signal is getting into the CP850? Is the problem reproducilbe? Can stuff be disconnected and make the problem go away? Good luck! Harold  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 03-01-2019 01:57 AM                     quote: Marcel Birgelen Well, if the update doesn't fix the problem, try to run it with all amplifiers switched off. Just to make sure it's not the same issue I've once encountered with a CP650. Well that's gonna be kinda hard to do, running shows without sound to try to replicate an intermittent problem.  |  IP: Logged

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