gibbothegreat Posted August 6, 2014 Share Posted August 6, 2014 Hi all, hoping someone here can recognise this fault and advise. We have a studio theatre which is allocated to the local Youth Theatre, and as such they shows they have done in there have not tended to be very technical. It does have a wiring infrastructure, including 2-channel comms on 6-pin XLR. This is driven by a Tecpro PS711 PSU which has 3 x 3-pin XLRs as its output, the conversion to 6-pin wiring is done as part of the installed wiring. This system has been used this week for the first time in the 5-year life of this studio, and up to this morning was working absolutely fine. However, it stopped working at some point this morning, and the symptoms are as follows: If any one BP and headset are plugged in, the DC light on the back dims to half. The pack doesn't function If more than one is plugged in, the DC light disappears altogether (there are a total of four packs, it's rated capacity is 16) Can't see how it can be a cable fault: it's worked fine for two days, the DC output is fully protected if one cable had been damaged, and the fault appears whenever any of the four beltpacks are plugged in. Update, it appears to be only measuring 3.22 volts output on the 3-pin XLRs at the rear of the PSU. Anyone any thoughts on what this might be? Cheers, Link to comment Share on other sites More sharing options...
s buckley-jones Posted August 6, 2014 Share Posted August 6, 2014 Update, it appears to be only measuring 3.22 volts output on the 3-pin XLRs at the rear of the PSU. If you have isolated the power supply from all the cable work and then mesured pin1 earth / pin 2 +24 volt . and the result you get is 3.22 . = dead power supply . If you are still plugged in to the system, cable fault / some thing still plugged in the is dragging down power heat is a great problem at this time off summer " nice that one can say this" dust does not help ! on all night? . I can only advise you have it bench tested by one who knows . . fall back/ do you need twin coms if not blag a power supply from hire firm . Link to comment Share on other sites More sharing options...
top-cat Posted August 6, 2014 Share Posted August 6, 2014 Have you considered pulling the master station / PSU out of the rack, plugging it with normal XLR cables into your belt packs in a simple set up within one room, and testing it like that? If you do that and it works fine, it's an installed cable issue. If you do that and it still doesn't work, it's a kit fault. Link to comment Share on other sites More sharing options...
dbuckley Posted August 6, 2014 Share Posted August 6, 2014 Sounds like a borked PSU; testing with cables as suggested above will confirm. Link to comment Share on other sites More sharing options...
Wingwalker Posted August 8, 2014 Share Posted August 8, 2014 +1 for PSU error. Link to comment Share on other sites More sharing options...
constabeats Posted August 8, 2014 Share Posted August 8, 2014 I aggree with top-cat. I have never heard of using 6-pin cables for comms - there is no need. Just use some patch cables to connect it all together with known working XLR's. Link to comment Share on other sites More sharing options...
Shez Posted August 8, 2014 Share Posted August 8, 2014 I have never heard of using 6-pin cables for comms - there is no need.Six pin is not unusual for two channel comms - one of my venues is wired throughout with six pin as standard. Shows that tour with six pin generally carry break-outs to a pair of three pin so they can get comms up to say the followspots through the venue's own tie lines. Link to comment Share on other sites More sharing options...
dbuckley Posted August 9, 2014 Share Posted August 9, 2014 When one says "6 pin comms", one needs to be aware there are two sorts of non-compatible 6 pin XLRs... Link to comment Share on other sites More sharing options...
s buckley-jones Posted August 12, 2014 Share Posted August 12, 2014 Well did it get sorted "it was this that was wrong" !!! ?sb-j Link to comment Share on other sites More sharing options...
Richard P-W Posted August 12, 2014 Share Posted August 12, 2014 When one says "6 pin comms", one needs to be aware there are two sorts of non-compatible 6 pin XLRs... I know of two different pin-outs, or are you referring to the "switchcraft" 6 pin XLR? Link to comment Share on other sites More sharing options...
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