planet audio vx2200d

bdgf2004

Member
2010-10-22 5:19 am
got this the other day and found one of the power supply fets was shorted. all 4 gate resistors measured at 97 ohms so i replaced all 4 fets in that bank. now the amp will come on but will go in and out of protection. it will produce audio but i can't tell if it's clean or not because it doesn't stay on long enough. does anyone know where i should look next?

thank you
 

bdgf2004

Member
2010-10-22 5:19 am
only 1 was shorted but i replaced a total of 4 because they were in parallel. i did notice though that as long as a have a load on the output it appears to not go into protection. almost as soon as i disconnect the load (2 ohm subwoofer) it will go in an out of protection. it is not producing clean audio though. with a sine wave it sounds fairly clean but with music it is definitely distorted. with the scope i can see the sine wave is not completely clean and smooth.
 

bdgf2004

Member
2010-10-22 5:19 am
100hz sine wave with 2 ohm load
 

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