can anyone fix my amp??

[skittlesRgood 10+ year member]

so i paid for a used amp and got a blown amp from some one... need to see if anyone can fix this thing.

autotek MX-5000

at about half power the amp goes into protect. however it seems to do just fine with test tones. i tuned it with a dmm, had the gain up about half way. 50hz tone. then i put on a song and the gain needs to be below 1/4 for it not to go into protect. at 1/4 gain and 45/62 volume itll protect easily. so not even 4v going out of the hu.

i poped it open and i can see evidence of a repair job. looks like half the chips that run on the outside of the board (under the heat sinks) half been replaced. number on those is "fmg33r". no idea if thats whats wrong but they all have cold solder joints so it could be a problem.

anyone have any idea what might be wrong here and can anyone fix it? idea of how much itll cost? maybe some one will make me a nice deal since i got screwed.

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[Horsemanwill 10+ year member]

contact zed audio

 

[kmanian 5,000+ posts]

dB-r Chris is the bomb!

 

[skittlesRgood 10+ year member]

any idea on price?

im guessing those are user names. ill go look em up. thanks guys

 

[Horsemanwill 10+ year member]

acutally zed audio is a company who first made the autotek amps for a small price he'll even "upgrade" your amp

http://www.zedaudiocorp.com

 

[kmanian 5,000+ posts]

http://www.db-r.com/

 

[skittlesRgood 10+ year member]

got it. contacted both of them.

 

[outspoken 10+ year member]

not gonna buy the crunch huh?

 

[skittlesRgood 10+ year member]

we'll see. my subs can take a good deal more power than the crunch can do. all depends on how much itll be to fix this thing.

 

[outspoken 10+ year member]

what are they wired to on the crunch? 4?

 

[skittlesRgood 10+ year member]

2ohm. 1500w. i would like close to 2500. and this amp will do that.

 

[dB-r 10+ year member]

The legs could be broken on those parts. The "FMG" parts are not mosfets, they are rectifiers. Problem with this amp, and alot of the older autotek class D's is the DLM Class D output driver modules. If they fail, the amp is basically junk, the modules cannot be repaired, nor can they be purchased from DLogix Corp in quantities less than 500 units. Comes out to about $5400.00.

The FMG parts and the mosfets in that amp ARE common however and there is a chance it will be repairable, especially if it stills at least kind of works... if it just stayed in protect or went in and out of protect constantly, even with no input signal then at least 1 of the modules could be bad. 50/50 shot is the usual...

 

[skittlesRgood 10+ year member]

hmm... a 50/50 chance of fixing it kinda sucks lol. if you can fix it can i get any idea how much itll cost? i just need to make sure its worth doing.

 

[dB-r 10+ year member]

PM'd you.

 

[TIeclipseMOJO 10+ year member]

pm me so i dont forget but i sent my buddy a message he has 3 mx5000s and i know hes had at least one of them repaired