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Old 17th January 2004, 01:18 AM   #1
diyAudio Member
Join Date: Jan 2004
Location: New Mexico
Unhappy Need help with Concept Audio ccd-2400 amplifier

I got a Concept Audio ccd-2400 amplifier from one of my friends because it was not working, when I opened it up 12 mosfets on one side were fried. Most of the mosfets had the source leg blown off. I replaced all of them with the same part number as the original (FQP 50N06) and powered on the unit, but the mosfets were burned once again within seconds of turning it on. What could be causing this? Do I have to check each component individually?
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Old 17th January 2004, 03:36 PM   #2
maylar is offline maylar  United States
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Join Date: Jun 2003
Location: Connecticut
I wouldn't even attempt to go any further without a schematic. You need to check the driver stages and both sides of the output circuits.
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Old 5th February 2004, 10:40 PM   #3
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Join Date: Apr 2002
Location: Dayton, OH
Default Whew!

A schematic won't help here - you need to know what you're doing first.

Blowing PS transistors is almost always caused by shorted outputs or a dead shorted free wheeling diode. Use your noggin and fix it again. Nothing like a nice expensive mistake to set you on your way.

I've been fixing car audio amps for years without schematics. In fact, I don't even own one schematic in my shop. I also build, they're not for sale.
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