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Soundcraft Spirit M12 – Power Supply Repair

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by Drew Brashler in All Posts, Repairs
August 12, 2012 3 comments

This last week I got the call that our soundboard in our choir practice room took a fiery and smokey trip to heaven and is not working! Turns out that the AC power fuse blew, after it was replaced, they powered it on again and they saw sparks, smoke, and flames!

Soundcraft Spirit M12 – Power Supply Repair

The board is a Soundcraft Spirit M12 which is a 16 channel board. The power supply was pretty easy to get to after removing 8 screws and disconnecting two wiring harnesses.

I shot the following photos of the power supply which has some pretty good damage. R24 burned a hole through the PCB board. The R27, R35, R36, R45, R47 resistors blackened the board as well as cracked from the heat. L2 boiled the casing and windings. Lastly, the filter capacitor 100uF 400V has a hole in the side of it.

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

Soundcraft Spirit M12 - Power Supply Repair

I called the Soundcraft USA parts department and they had a power supply module on hand for $137. So that is being shipped to the church and will be replaced and back in service about 1-2 weeks after the incident. It will be interesting to see what revisions they have made on the power supply board in recent years.

Not too shabby of a repair. Pretty simple really. The benefit of this mishap is that I will probably mount this mixer in a portable rack. Along with adding a few amps, wireless mic and a few eq’s will make a portable system for the church. Which is something that the facility currently does not have.

If you liked this article, you may also like my repair of a Furman PowerPort!

3 Comments
  1. Antonio says:

    Hello, I had the same trouble with my M12…as I live in Italy it’s very difficult to have the power supply replced. could you send me a high resolution picture from the new one upgraded or send me values for the components to change? thanks in advance, Antonio

  2. Thanks for sharing. I have got a Soundcraft Spirit M4 with a blown fuse and dead PSU, which I intend to repair.

    Is it only components before the switching power supply that burned, i.e. around the input RFI filter and the mains rectifier before the transformer?

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GET THE X32 ROUTING WORKSHEET FOR FREE!

I FOUND THAT OVER THE YEARS, HAVING MY ROUTING WRITTEN DOWN NOT ONLY MADE MY JOB EASIER BUT IT MADE ME FASTER AT MY JOB!

AS A THANK YOU FOR COMING TODAY, I WANT TO GIVE IT TO YOU!

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