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<blockquote data-quote="Spooney" data-source="post: 7143434" data-attributes="member: 584130"><p>It sounds like you have some FET&#039;s that are probably on their way out. A part doesn&#039;t have to look burnt to be defective. It can look perfectly new and still be internally shorted or leaking. If you have a multimeter you can start by setting that to continuity check or the lowest ohms range and checking between the legs of the heatsink mounted FET&#039;s and transistors.&nbsp; If you have any real low numbers here you definitely have some shorted/leaky FET&#039;s . If you get anything near zero between any two legs on a FET then it is most definitely shorted. I wouldn&#039;t really attempt to play anymore sound through it at all until you get something figured out. If you can, try powering the amp up through a 15 - 20 amp fuse with no signal driven into the amp. If the amp won&#039;t turn on and idle without blowing that size fuse then you definitely have a defective output or power supply FET. If this rockford amp uses the mehsa system for mounting the FET&#039;s you are going to have a hell of a time trying to repair it yourself. If it is mehsa the FET&#039;s themselves are soldered directly onto little boards that are then screwed/secured to the heatsink to aid in heat transfer.&nbsp; There is no way you are getting those FET&#039;s off of those strips with a regular soldering iron without Fxxxking up the mehsa strip so don&#039;t even try it. These rockford amps are a pain for even experienced techs. If you only kinda know what you are doing and honestly it sounds like you have maybe a very very basic knowledge of amplifier repair I wouldn&#039;t even mess with the amp. Either send it to a reputable repair shop or sell it as is.</p></blockquote><p></p>

[QUOTE="Spooney, post: 7143434, member: 584130"] It sounds like you have some FET's that are probably on their way out. A part doesn't have to look burnt to be defective. It can look perfectly new and still be internally shorted or leaking. If you have a multimeter you can start by setting that to continuity check or the lowest ohms range and checking between the legs of the heatsink mounted FET's and transistors. If you have any real low numbers here you definitely have some shorted/leaky FET's . If you get anything near zero between any two legs on a FET then it is most definitely shorted. I wouldn't really attempt to play anymore sound through it at all until you get something figured out. If you can, try powering the amp up through a 15 - 20 amp fuse with no signal driven into the amp. If the amp won't turn on and idle without blowing that size fuse then you definitely have a defective output or power supply FET. If this rockford amp uses the mehsa system for mounting the FET's you are going to have a hell of a time trying to repair it yourself. If it is mehsa the FET's themselves are soldered directly onto little boards that are then screwed/secured to the heatsink to aid in heat transfer. There is no way you are getting those FET's off of those strips with a regular soldering iron without Fxxxking up the mehsa strip so don't even try it. These rockford amps are a pain for even experienced techs. If you only kinda know what you are doing and honestly it sounds like you have maybe a very very basic knowledge of amplifier repair I wouldn't even mess with the amp. Either send it to a reputable repair shop or sell it as is. [/QUOTE]

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