Amp Fix: Anyone up for the challenge?

[psych0ticnemes1 5,000+ posts]

I have a concept cc-d1200 that is in great condition, but stopped working suddenly one day. It powers on but doesn't send any power. It doesn't sound like a huge problem. I may be willing to pay if someone can fix it relatively cheap. I just thought that maybe some of you would like a challenge.

Thanks guys,

Psych0

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[stratastic 10+ year member]

i had a problem that sounded very close to that and my problem was that the ohm load was at .6 on a 2ohm stable amp. i made the mistake of wiring them wrong.

 

[keifersracing 10+ year member]

tolk to shallowfu about it but he was a lot to do, But i would tolk to him see if he can do it

 

[thch 10+ year member]

likely damage to one of the output fets.

you should open the amp up, and see if there is any damage.

also check for any blow external or intenal fuses.

next, find a DMM. about mid way down the amp's heatsink there is likey a bunch of 8 transistors that are clamped to the heatsink. there will also be similar devices elsewhere in the amp, those near the power connection will be part of the power supply.

looking at the devices, measure the impedance between the middle pin, and the one directly to the right. if devices are on both sides, rotate the amp and measure the same two pins on the rest of these devices. you should be able to test all the devices attached to the heatsink. one will be a dual diode pack and may show up as 500ohm or so. another may show up with some impedance as well.

if the devices measure 0ohm on a 20ohm scale, then there is probably a problem. most likely two devices will read faulty. now remove the clamp from these transistors. read the part number. go to digikey, mouser, newark, arrownac and such and see if you can find the part. it may be an irf2807 or such, they were popular a while back. you may want to get enough to replace the entire set.

when replacing parts, do not touch the transistor leads if you can avoid it. MOSFETs are more susceptible to static electricity then other power devices.