I got this amp in for repair from a collector who was hesitant in letting me work on it. I've never worked on a Class-D amp before but it really doesnt look all that much different thatn what I've learned thus far. This amp is big, one of the largest I've worked on. On the cover it says 4000w which makes it potentially the most powerfull and/or most dangerous.
The amp powers up with a 10a fuse and plays, but its got an absorbant ammount of distortion. Theres not much the built in corssovers do for tuning the signal. If I adjust the qBass control it almost looks like the amp is about to correct but by the time I stop turning the qBass knob the signal is well distorted again.
I checked the JRC5034G opamps and all have +/- 13.5vdc. The large coild in the center measure up about 110v, and the rail voltage is +- 70v.
When I remove power from the amp, the test speaker POPs. I think it might be a Class-D thing, as if I simply remove REM the amp powers off and the speaker wont pop.
Here is what the signal always looks like on the scope while the test speaker is distorting badly.
The amp powers up with a 10a fuse and plays, but its got an absorbant ammount of distortion. Theres not much the built in corssovers do for tuning the signal. If I adjust the qBass control it almost looks like the amp is about to correct but by the time I stop turning the qBass knob the signal is well distorted again.
I checked the JRC5034G opamps and all have +/- 13.5vdc. The large coild in the center measure up about 110v, and the rail voltage is +- 70v.
When I remove power from the amp, the test speaker POPs. I think it might be a Class-D thing, as if I simply remove REM the amp powers off and the speaker wont pop.
Here is what the signal always looks like on the scope while the test speaker is distorting badly.

