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Old 3rd July 2012, 07:39 PM   #1
m4ick is offline m4ick  United States
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Default 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?
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Last edited by m4ick; 3rd July 2012 at 07:43 PM.
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Old 3rd July 2012, 09:57 PM   #2
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You can test the drivers without the outputs in the amp. Check item #31 on the Generic Class D - Type 2 page.
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Old 3rd July 2012, 10:35 PM   #3
m4ick is offline m4ick  United States
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Mine only has 27 items.
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Old 3rd July 2012, 10:38 PM   #4
m4ick is offline m4ick  United States
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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.
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Old 3rd July 2012, 11:26 PM   #5
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I don't think that was necessary for this amp. If you find it necessary, make a note of it here.
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Old 3rd July 2012, 11:28 PM   #6
m4ick is offline m4ick  United States
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My tutorial only has 27 items on that page. Do I have an older version of the tutorial?
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Old 3rd July 2012, 11:35 PM   #7
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It appears so. I think that was added in mid 2011. Email me if you have any other questions regarding the tutorial.
babin_perry@yahoo.com
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Old 4th July 2012, 12:40 AM   #8
m4ick is offline m4ick  United States
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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?
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Old 4th July 2012, 12:49 AM   #9
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Short between solder pads for outputs or drivers?

Is the board leaking internally? Item #22.
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Old 4th July 2012, 12:49 AM   #10
m4ick is offline m4ick  United States
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Found a solder bridge, I looked really hard at first but it was just a hairline.

Thanks.
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