Just reaching out. The Power Supply of my M12 failed (fuses keep blowing). I know thayt it's nor worth a lot, but I would like to get it going again. I only use it for various charity recordings. Is there anyone out there in NW London who might be able to help?
Many thanks!
Brian
Souncraft 12 Power Supply Repair
Souncraft 12 Power Supply Repair
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- Brian M Rose
Regular - Posts: 199 Joined: Mon Sep 05, 2011 12:00 am
Re: Souncraft 12 Power Supply Repair
Hi Brian, I found a supply very quickly but it was £110 and out of stock!
The unit is also a Switch Mode Supply on a PCB and would require some servicing skills to fit which would add to the cost. Even if you could do it yourself you would really have to take it for a PAT especially if it is used around the general public.
This might be time to look for another mixer? Shame I know. I found one on ebay for £195.
I know SMPSUs are tricky things to fix but you would have thought by now some enterprising bod would have setup a service facility? It seems you can get just about anything fixed for an old car!
Dave.
The unit is also a Switch Mode Supply on a PCB and would require some servicing skills to fit which would add to the cost. Even if you could do it yourself you would really have to take it for a PAT especially if it is used around the general public.
This might be time to look for another mixer? Shame I know. I found one on ebay for £195.
I know SMPSUs are tricky things to fix but you would have thought by now some enterprising bod would have setup a service facility? It seems you can get just about anything fixed for an old car!
Dave.
Re: Souncraft 12 Power Supply Repair
It's a switched mode supply, and fixing it would probably cost more than the mixer's worth. if it's happily blowing fuses then something significant at the front end has blown, and probably damaged other parts of the circuitry along the way! If you can source a NOS replacement it's a straightforward job to unplug the duff one and plug in the new one.... it's just a question of tracking down a new board. I believe the digital output converter is part of the same board, by the way...
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- Hugh Robjohns
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Re: Souncraft 12 Power Supply Repair
Many thanks for the replies, even if they weren't what I was hoping for. Sounds like, for want of a nail the horseshoe was lost....
I'm, OK at the moment, I bought a redundant but not quite as flexible mixer from Radio Harrow and it does work OK in my studio. But I hate throwing things away.
Cheers
Brian
I'm, OK at the moment, I bought a redundant but not quite as flexible mixer from Radio Harrow and it does work OK in my studio. But I hate throwing things away.
Cheers
Brian
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- Brian M Rose
Regular - Posts: 199 Joined: Mon Sep 05, 2011 12:00 am
Re: Souncraft 12 Power Supply Repair
The power supply part of the M12 PSU board is mainly discrete components, so if it's one or more of those parts, it shouldn't be too hard for someone to fix.
http://studiorepair.com/gallery/Soundcr ... 25961.html
Quite a few electrolytics on there, one of which could have gone faulty, but in the example shown on the web site, R35 and R47 have got hot and discoloured the PCB. These probably need to be higher wattage resistors and raised off the board for better cooling.
Worth at least taking the board out and having a look at it - post some pictures if you're not sure.
http://studiorepair.com/gallery/Soundcr ... 25961.html
Quite a few electrolytics on there, one of which could have gone faulty, but in the example shown on the web site, R35 and R47 have got hot and discoloured the PCB. These probably need to be higher wattage resistors and raised off the board for better cooling.
Worth at least taking the board out and having a look at it - post some pictures if you're not sure.
Reliably fallible.
Re: Souncraft 12 Power Supply Repair
There's a 100uF 400V capacitor on there. Admittedly the one in the pic is a good make but I've had a few of those of other makes fail on other things so it would by my first target for replacement.
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- James Perrett
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Re: Souncraft 12 Power Supply Repair
James Perrett wrote: ↑Tue Apr 18, 2023 6:07 pm There's a 100uF 400V capacitor on there. Admittedly the one in the pic is a good make but I've had a few of those of other makes fail on other things so it would by my first target for replacement.
That would be my prime suspect too, also the rectifier (the little round thing tucked behind it).
It is a comparatively simple board, so should be do-able. However, before doing that, does it still blow fuses if you unplug the cable taking the power to everything else? You could waste a lot of time (and money) if it doesn't!
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- Folderol
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Re: Souncraft 12 Power Supply Repair
Thanks All
What great advice from so many people. I'll give it a go if it's possible to getto the Power Supply without having to remove all the pots on the top of the Mixer. It would be a shame to have to scrap it for the sake of a couple of low cost components. I seem to remember originally buying it via the SOS website.
Again, many thanks!
Brian
What great advice from so many people. I'll give it a go if it's possible to getto the Power Supply without having to remove all the pots on the top of the Mixer. It would be a shame to have to scrap it for the sake of a couple of low cost components. I seem to remember originally buying it via the SOS website.
Again, many thanks!
Brian
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- Brian M Rose
Regular - Posts: 199 Joined: Mon Sep 05, 2011 12:00 am
Re: Souncraft 12 Power Supply Repair
A useful trick is to make up a power lead with a 150w incandescent bulb on the line side in series. When fixing power supplies this limits the current to around 0.5A which makes a short circuit less damaging.
Note that the caps have to be low ESR units rated for appropriate temperature and of course voltage. If you are lucky it might just be a surge suppression MOV which has shorted out.
Please remember that capacitors can hold a potentially lethal charge with power off for extended time periods. A 10k 5w resistor and a pair of insulated croc clip leads are handy to go round and discharge all caps.
If you do not have a decent temperature controlled soldering iron and a reasonable DVM then this isn't really a job to take on.
Note that the caps have to be low ESR units rated for appropriate temperature and of course voltage. If you are lucky it might just be a surge suppression MOV which has shorted out.
Please remember that capacitors can hold a potentially lethal charge with power off for extended time periods. A 10k 5w resistor and a pair of insulated croc clip leads are handy to go round and discharge all caps.
If you do not have a decent temperature controlled soldering iron and a reasonable DVM then this isn't really a job to take on.