Question about Rockford Fosgate 800.2 Car Audio Amplifier
When you say the amp does not power up, does it do nothing at all when you apply remote power or does it blow the fuse? If it does nothing at all and you are sure your wiring is correct and you have proper voltage to the amp your power supply is fried. If it blows the fuse as soon as you apply remote power you have a shorted output fet. You can use a multimeter to locate the bad fet. Once you find it or them you can clip all 3 legs from them (source, gate, drain) so it or they are no longer connected to the board. Then using a fuse again try and power the amp up. It should then power up fine if the power supply is ok. If you are going to repair it yourself be sure to be thourough. Replace the fets, the gate drivers, and test or replace your emitter resistors. That amp probably uses IRF640 and IRF9640 output fets. Gate drivers are probably 51 OHM and the emitters are 0.1 OHM 1/4 watt **** I always upgrade to a 2 watt metal oxide. You better no what you are doing when removing and replacing the fets from the MESHA board. If you don't then don't do it. You could probably call rockford and order the mesha board with the new fets already soldered on but you will still have to address the gates and emitters if needed. Hope this helps.
Posted on Nov 02, 2009
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.
If the voltage is OK, the amp will likely need to be repaired. If that's the case, do you want to repair it yourself? This amp may not be easy to repair. If you are not interested in learning to do this type of work, you should pay to have it repaired. If you want to repair it yourself, I'll try to help you through it.
Posted on Nov 12, 2008
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Posted on Jan 02, 2017
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