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m4ick 3rd July 2012 07:39 PM

Soundstream PCA2000D
This is a clone amp.

I am so frustrated with this amp, self oscillating is a pain, I just wish I could see what the drivers are doing with no outputs installed.

I replaced both banks of outputs (31N20D) and Q124 and Q125 (MPSA42).

As soon as it tries to come out of protect it instantly shorts the low side outputs.

What else besides Q124 and Q125 would make this happen?

Perry Babin 3rd July 2012 09:57 PM

You can test the drivers without the outputs in the amp. Check item #31 on the Generic Class D - Type 2 page.

m4ick 3rd July 2012 10:35 PM

Mine only has 27 items.

m4ick 3rd July 2012 10:38 PM

Do I tie the inductor input to negative speaker? That's how I've always seen it done to get the high side signal to appear.

Perry Babin 3rd July 2012 11:26 PM

I don't think that was necessary for this amp. If you find it necessary, make a note of it here.

m4ick 3rd July 2012 11:28 PM

My tutorial only has 27 items on that page. Do I have an older version of the tutorial?

Perry Babin 3rd July 2012 11:35 PM

It appears so. I think that was added in mid 2011. Email me if you have any other questions regarding the tutorial.

m4ick 4th July 2012 12:40 AM

With all the outputs removed I powered it up and R192 went up in flames. Replaced Q124 and 125 again along with R192 and R192 burns up again as soon as it is powered on. Any idea why?

Perry Babin 4th July 2012 12:49 AM

Short between solder pads for outputs or drivers?

Is the board leaking internally? Item #22.

m4ick 4th July 2012 12:49 AM

Found a solder bridge, I looked really hard at first but it was just a hairline.


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