good afternoon everyone, I have a problem with a rockfor fosgate T2000 amplifier, little sound and distorted, the operational ICs u300, 301,302, 303 etc have -8.24 volts and 3.45 volts, any suggestions? Thanks in advance
It looks like you have a broken ground connection. Is the amp mounted to the bottom cover with all of the screws in place and tight?
the screws are firm; I checked again and I realized that the rectifier diodes D27,D28,D29,D30 etc have +49 fixed and -2.6, -2.8,-3.0 intermittently, with the negative probe connected to the RCA shield, the same with the negative probe connected to B Neg.
The rectifiers don't have a ground reference. They float, along with the rails. Initially and at shutdown, you will read the positive voltage but after the amp is producing rail-rail oscillation, the voltage will be near 0 volts.
There should be a direct connection between all of the points with a primary ground symbols (inverted Christmas tree?).
The RCA shield is a different ground.
There should be a direct connection between all of the points with a primary ground symbols (inverted Christmas tree?).
The RCA shield is a different ground.
You're right Perry, the ground of the diodes is floating, I checked the voltage at the ends of the copper bars that go through the middle of the toroids and I have 103 volts; all the screws of the aluminum plate are screwed and they are the ones with the image that looks like an inverted tree, note that the protection light flashes to the rhythm of the bass (distortion)