Soundstream PCA2000D

m4ick · 07:43 PM

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.
babin_perry@yahoo.com

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.

Thanks.

3rd July 2012, 07:39 PM	#1
m4ick diyAudio Member Join Date: Jan 2010 Location: Gainesville, FL	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? __________________ Scope - DMM - 460W Computer PSU - Tutorial Last edited by m4ick; 3rd July 2012 at 07:43 PM.

3rd July 2012, 10:38 PM	#4
m4ick diyAudio Member Join Date: Jan 2010 Location: Gainesville, FL	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. __________________ Scope - DMM - 460W Computer PSU - Tutorial

3rd July 2012, 11:26 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't think that was necessary for this amp. If you find it necessary, make a note of it here. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd July 2012, 11:28 PM	#6
m4ick diyAudio Member Join Date: Jan 2010 Location: Gainesville, FL	My tutorial only has 27 items on that page. Do I have an older version of the tutorial? __________________ Scope - DMM - 460W Computer PSU - Tutorial

3rd July 2012, 11:35 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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 __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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3rd July 2012, 09:57 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You can test the drivers without the outputs in the amp. Check item #31 on the Generic Class D - Type 2 page. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd July 2012, 10:35 PM	#3
m4ick diyAudio Member Join Date: Jan 2010 Location: Gainesville, FL	Mine only has 27 items. __________________ Scope - DMM - 460W Computer PSU - Tutorial

4th July 2012, 12:40 AM	#8
m4ick diyAudio Member Join Date: Jan 2010 Location: Gainesville, FL	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? __________________ Scope - DMM - 460W Computer PSU - Tutorial

4th July 2012, 12:49 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Short between solder pads for outputs or drivers? Is the board leaking internally? Item #22. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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