Members soundman11 Posted January 10, 2015 Members Share Posted January 10, 2015 hey guy's i just got a shure pro master power console model 700 and it has started to shutdown after a few minutes of being on no mater if there is a load conected or if music is playing or not. the shutdown led will come on and if there is music playing and a load is conected the pa overload led's will come on and i get no sound out of the speakers after that.when i first got it i played music for 2 hours or so and i had no problems. please help i would love to be able to use this. also i think this was made some where around 1970-1979. Link to comment Share on other sites More sharing options...
Members Gordon Sound Posted January 10, 2015 Members Share Posted January 10, 2015 IS the fan working? You might want to open t up and clean it- I think the bottom plate just comes off. That mixer is probably 40 years old. A cool mixer in its day, but so old it cant possibly be reliable. I did lots of gigs with one of these and the matching mains and monitors. Link to comment Share on other sites More sharing options...
Members soundman11 Posted January 10, 2015 Author Members Share Posted January 10, 2015 yes, when i got it the first thing i did was clean the filter and open it and cleaned it a little becuase the two 9 band graphic eq was really durty and scratchy. Link to comment Share on other sites More sharing options...
Members soundman11 Posted January 10, 2015 Author Members Share Posted January 10, 2015 was just testing it and it did it again and if i unplug the speakers the pa overload led's turn off and shutdown led stays on. then if i plug the speakers back in i have sound at low volumes for a small amount of time, then overload led's turn back on and i get no sound again. And yes i have tryed diffrent inputs Link to comment Share on other sites More sharing options...
Members Gordon Sound Posted January 10, 2015 Members Share Posted January 10, 2015 Can you try another set of speaker cables? or another set of speakers? Sounds like a shorted speaker cable. Link to comment Share on other sites More sharing options...
Members soundman11 Posted January 10, 2015 Author Members Share Posted January 10, 2015 well it shuts down when ever it fells like it even if there is no load or music playing. but at the moment no i can not try diffrent cables/speaker becuase i do not have another pair of speakers at my house right now. heres a little text out of the manuel for the mixer. LCD Status lndicotors POWER-Indicates application of ac voltage to power supply whenrear-panel ON-OFF switch is turned on. TEMP WARNING-Lights when unusually high temperature of 70°C(158°F) is reached on the output transistors. Indication may be due toblockage of air louvers, dirty air filter, or operating the console at a highoutput level with a low load impedance (too many speakers or ashort-circuited output). Indicator will turn off when transistor casetemperature drops below 70°C. If indicator lights, it is advisable to identifythe cause and make corrections to avoid shutdown. SHUTDOWN-When indicator is on, both power amplifiers are turned off(all other circuits remain on). The console may shut down for one of thefollowing reasons: (1) excessive temperature due to inadequate cooling(see TEMP WARNING), (2) dc voltage on speaker lines due to powertransistor failure (check for this condition by turning the console off,waiting several minutes, and turning it back on), or (3) airflow blockagedue to fan failure or air passage obstruction. Link to comment Share on other sites More sharing options...
Members agedhorse Posted January 10, 2015 Members Share Posted January 10, 2015 Most likely that there's DC offset present, or that the time delay mute circuit is failing. This is not user serviceable stuff unfortunately. Link to comment Share on other sites More sharing options...
Members soundman11 Posted January 10, 2015 Author Members Share Posted January 10, 2015 Well it depends who the user is. I know my way around a schematic and if I can find out what's wrong with it I should be able to fix it, with some help frome you guys and your knowledge. Link to comment Share on other sites More sharing options...
Members soundman11 Posted January 10, 2015 Author Members Share Posted January 10, 2015 Is there anything I can do to try and nerow it down Link to comment Share on other sites More sharing options...
Members Pro Sound Guy Posted January 10, 2015 Members Share Posted January 10, 2015 Dried up caps in power supply? Its giving up the ghost. Link to comment Share on other sites More sharing options...
Members soundman11 Posted January 10, 2015 Author Members Share Posted January 10, 2015 I really want to get it fixed, so if any in one knows of a place the can fix it for me or tell me exactly whats wrong with it that would be amazing.i live in brevard county florida Link to comment Share on other sites More sharing options...
Members agedhorse Posted January 10, 2015 Members Share Posted January 10, 2015 I am not clairvoyant. Do you have a scope? Link to comment Share on other sites More sharing options...
Members soundman11 Posted January 11, 2015 Author Members Share Posted January 11, 2015 no , but i do have a multimeter, soldering iron, and other tools like that Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted January 11, 2015 CMS Author Share Posted January 11, 2015 Then you don't have what's needed to troubleshoot the problem. A decent electronics repair shop can do that. If you don't know of any, ask around in the local music shops. Central Florida Speaker Repair in Orlando could be a good place to ask who's good. It was the first hit I found looking for a shop in FL. Link to comment Share on other sites More sharing options...
Members Unalaska Posted January 11, 2015 Members Share Posted January 11, 2015 Get a shovel, dig a deep hole in the backyard. Bury this thing deep. Link to comment Share on other sites More sharing options...
Members nchangin Posted January 12, 2015 Members Share Posted January 12, 2015 Maybe a pro audio museum out there? That looks just like my first mixer I inherited early 90's sometime..... I bought a cs800 for the band and the guy who owned the pa moved and traded me that mixer and two stacks of home grown speakers (drivers were altec lansing) for the cs800.....I believe it had 2 amps on it like rated at 200 w? One amp for monitors and one for mains? On something that old even if you replace the failure piece, plug it in, possible the whole line will keep popping which caused the failure in the first place. I'm not sure why you want to keep something in service that isn't worth the weight of it's own copper for recycling.....For a shop to even give you a quote would exceed the value of that mixer. Link to comment Share on other sites More sharing options...
Members Gordon Sound Posted January 16, 2015 Members Share Posted January 16, 2015 If its not a basic repair I wouldn't mess with it, unless it has some Kind of sentimental value. I have the same unit and a Biamp 12/29 in the back, both have sentimental value but I am not going to dump any cash into them. Even though I really like the pro master. Link to comment Share on other sites More sharing options...
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