LizParkinson Posted November 28, 2014 Share Posted November 28, 2014 Hi there folksCurrently having some problems with our comms system.We're running Tecpro BP511s from an MS745 base station. We have 6 packs and headsets running on two chains (3/chain), but both running off of circuit A. There is no internal building wiring, it's all run off of XLR, (we're pretty sure there's a fault in Original comms wiring). All of this has worked perfectly well until 7;25 this evening when we were close to starting the show.Every headset, on both chains, can hear themselves perfectly, and only hear everyone else faintly. The call/signal buttons don't work at all - it lights up for the person pressing the call button, but not on any other packs. This is true for belt packs communicating between each other, as well as the base station communicating with everyone else, and this is on both chains. It was working fine before we opened the house, as some of the kids were talking to each other on it, and as I was on comms too I could hear them just fine!We're a little stumped about what could break in such a short space of time. I did think it could be that someone had fiddled with the side tones and turned them down, but I've checked and it's fine, and that wouldn't explain why the signal/call function isn't working either. A cable fault could explain it, but even the pack directly connected to the station is having these problems with multiple XLRs, on both chains. Any insight you can provide would be greatly appreciated!!!Many thanks,Liz Link to comment Share on other sites More sharing options...
boatman Posted November 28, 2014 Share Posted November 28, 2014 It sounds as though the termination resistors in the power unit have gone short-circuit. The quickest way to check is to swap the circuits to the other channel on the MS745. Link to comment Share on other sites More sharing options...
LizParkinson Posted November 28, 2014 Author Share Posted November 28, 2014 1417209673[/url]' post='512236']It sounds as though the termination resistors in the power unit have gone short-circuit. The quickest way to check is to swap the circuits to the other channel on the MS745. Thank you for the quick response Boatman! Will give that a go when the show ends http://www.blue-room.org.uk/public/style_emoticons/default/smile.gif 1417209673[/url]' post='512236']It sounds as though the termination resistors in the power unit have gone short-circuit. The quickest way to check is to swap the circuits to the other channel on the MS745. Tried this and I'm afraid we're still having the same problems! Is there any significance in the fact that when I plugged it in one of the B channels sparked? Seems a bit odd for comms to do.... Link to comment Share on other sites More sharing options...
djw1981 Posted November 28, 2014 Share Posted November 28, 2014 not teaching you how to suck eggs, but its not got one of the xlr's connected via a global phantom somewhere - splitter/stagebox etc? Link to comment Share on other sites More sharing options...
DrV Posted November 29, 2014 Share Posted November 29, 2014 Sounds like the audio wire is shorted to ground somewhere. A bit of systematic fault finding is called for - use the call lights as a go/no go test. Disconnect each half of the system from the base station at a time and see which half is causing the problem. If it's there on both halves then the fault is in the base station. Otherwise disconnect each beltpack in turn and join the two ends of the loop together. If it is none of the beltpacks then it must be one of your XLR cables. Break the chain at each point working from the end back to the base. When the call lights start to work properly you've just disconnected the faulty length. The spark is not unusual and is just the 24V charging up all the decoupling capacitors in the belt packs. Hope this helpsDave Link to comment Share on other sites More sharing options...
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