DIY repair, a power surge, a mixing console, and me. - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th March 2010, 10:03 PM   #1
diyAudio Member
 
Join Date: Mar 2010
Default DIY repair, a power surge, a mixing console, and me.

Hi everybody.
I'm posting to get some advice, or perhaps to be pointed in the right direction. The backstory: some friends of mine had their Mackie 408M mixing console blown by a surge when the venue's sound man hooked it up to a generator which was malfunctioning. They didn't have time to mess around with repairing a twelve-or-so year old mixer, so they bought a new one. They were going to throw the broken one out, but I told them I'd like to take it and try to fix it, and they then said I could have it.

They're on the road right now, so I haven't had a chance to open up and look at the unit. My question is this: before I ask them to drag it all the way back here, is there a chance that it is fixable? I realize that this could depend on a whole lot of variables. I'm just wondering if it's possible that the unit is salvageable, and if so, if I would have to invest very much into fixing it?

If it is salvageable, any tutorial suggestions or hints as to what I'd have to read up on would be greatly appreciated too. Thanks
  Reply With Quote
Old 26th March 2010, 10:16 PM   #2
diyAudio Member
 
Join Date: Mar 2010
Sure it's repairable! First, pop the cover and look for burned parts. Power supply is the first place to look. Get a diagram so you aren't working blind. These are not complex devices, at least considering what the problem here is.
  Reply With Quote
Old 26th March 2010, 11:11 PM   #3
Xoc1 is offline Xoc1  United Kingdom
diyAudio Member
 
Xoc1's Avatar
 
Join Date: Nov 2008
Location: Devon UK
I see that a 408m is a powered mixer.
The mixer section is likely to survive as it would be regulated. The power amplifier could be another story altogether
  Reply With Quote
Old 26th March 2010, 11:34 PM   #4
diyAudio Member
 
Join Date: Jul 2004
Location: Edmonton, AB Canada
It's surely worth a look to fix it. Generators can overvoltage to the point where IC's short, filter capacitors fail and leak etc. hopefully just the fuse went. If it's 12 years old it will be pretty durable.
  Reply With Quote
Old 26th March 2010, 11:45 PM   #5
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
All we really know is that it was on generator power, and it no longer works. Did it receive 150v? 800v? Reversed neutral and ground or something? We have no idea, consequently we have no idea what is wrong with it. We have to find out.

Isolate the problem. If it is "dead" as in no signs of life, then start with power supply. Is the main power supply even getting mains voltage? You could have a burnt out inrush limiting thermistor or something or a dead varistor somewhere. Oops, no inrush part on the 408.

I agree the power amps are the most suspect. Try disconnecting them.

And contact Mackie at Loud Technologies and request the schematic set for your mixer.
  Reply With Quote
Old 27th March 2010, 06:56 PM   #6
diyAudio Member
 
Join Date: Mar 2010
Thanks a lot for the replies!

When I get my hands on it, I'll open it up and see what story the power supply tells and move on from there. And get in touch with Mackie, too. Thanks again for the advice
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mixing console faders. argonrepublic Instruments and Amps 3 19th June 2005 05:50 PM
mixing console bus bar argonrepublic Parts 5 7th June 2005 04:17 PM
Strange problem with mixing console Pierre Class D 4 1st June 2005 09:14 AM
Mixing console upgrade with carlosfm donnie7 Parts 43 19th April 2005 08:32 PM


New To Site? Need Help?

All times are GMT. The time now is 08:10 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2