Diodes in SPL Dinamics ext-3000D

melzarb · 05:43 PM

Hi There, Does anyone knows values of D2 and D4 in the DWM3640nhv_v30 module please ?

Perry Babin · 19th March 2013, 05:09 AM

Please don't post in a repair thread that was started by someone else unless you are trying to help them.

Click on the red triangle in the lower left corner of your post and ask a moderator to move your post (and any replies to it) to a new thread (my post should be deleted).

After it's moved, I'll try to help you.

melzarb · 21st March 2013, 10:15 AM

Just did as you said Perry. Sorry for the mess.

Pano · 21st March 2013, 11:30 AM

Moved to new thread

melzarb · 21st March 2013, 12:29 PM

Thanks Pano. Hope someone can help!!

Deadly Sones · 21st March 2013, 04:19 PM

Maybe a close up pic of the diodes and/or of the board location might help someone to identify them for you.

melzarb · 21st March 2013, 05:01 PM

There is nothing written on these diodes but I will send a pic

Perry Babin · 21st March 2013, 08:42 PM

I don't have any definitive information on these. I don't recall anyone having a defective one. If you don't know definitively that they're defective, I'd suggest leaving them as they are.

I think that they're standard switching diodes. If that's so, anything like an RLS4148 may be a suitable substitute.

melzarb · 22nd March 2013, 06:28 AM

Actually I have D2 which is getting shorted. This is the second module I had to change because of this diode. I don't know what is happening as in the meanwhile the amp works fine but then it goes on protection and I find this diode shorted.

Perry Babin · 22nd March 2013, 12:39 PM

D2 has to charge a 10uf capacitor when the amp goes into over-current protection. There is a 4.7 ohm resistor that (I'm assuming) is there to limit the inrush current to the capacitor. Increasing the value of that resistor a bit (10-15 ohms) may protect the diode. It shouldn't affect the protection circuit but without thorough testing, there's no way to know if increasing the value would prevent the amp from going into protect quickly enough.

Another way to protect the diode would be to reduce the value of the 10uf capacitor.

Since this isn't a common problem, have you asked the manufacturer of the amp if they have any suggestions or experience with this type of failure?

19th March 2013, 01:19 AM	#1
melzarb diyAudio Member Join Date: Mar 2013	Diodes in SPL Dinamics ext-3000D Hi There, Does anyone knows values of D2 and D4 in the DWM3640nhv_v30 module please ? Last edited by melzarb; 21st March 2013 at 05:43 PM.

19th March 2013, 05:09 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Please don't post in a repair thread that was started by someone else unless you are trying to help them. Click on the red triangle in the lower left corner of your post and ask a moderator to move your post (and any replies to it) to a new thread (my post should be deleted). After it's moved, I'll try to help you. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

21st March 2013, 08:42 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't have any definitive information on these. I don't recall anyone having a defective one. If you don't know definitively that they're defective, I'd suggest leaving them as they are. I think that they're standard switching diodes. If that's so, anything like an RLS4148 may be a suitable substitute. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

22nd March 2013, 12:39 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	D2 has to charge a 10uf capacitor when the amp goes into over-current protection. There is a 4.7 ohm resistor that (I'm assuming) is there to limit the inrush current to the capacitor. Increasing the value of that resistor a bit (10-15 ohms) may protect the diode. It shouldn't affect the protection circuit but without thorough testing, there's no way to know if increasing the value would prevent the amp from going into protect quickly enough. Another way to protect the diode would be to reduce the value of the 10uf capacitor. Since this isn't a common problem, have you asked the manufacturer of the amp if they have any suggestions or experience with this type of failure? __________________ 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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21st March 2013, 10:15 AM	#3
melzarb diyAudio Member Join Date: Mar 2013	Just did as you said Perry. Sorry for the mess.

21st March 2013, 11:30 AM	#4
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Moved to new thread

21st March 2013, 12:29 PM	#5
melzarb diyAudio Member Join Date: Mar 2013	Thanks Pano. Hope someone can help!!

21st March 2013, 04:19 PM	#6
Deadly Sones diyAudio Member Join Date: Feb 2011 Location: Windsor, Ontario	Maybe a close up pic of the diodes and/or of the board location might help someone to identify them for you.

21st March 2013, 05:01 PM	#7
melzarb diyAudio Member Join Date: Mar 2013	There is nothing written on these diodes but I will send a pic

22nd March 2013, 06:28 AM	#9
melzarb diyAudio Member Join Date: Mar 2013	Actually I have D2 which is getting shorted. This is the second module I had to change because of this diode. I don't know what is happening as in the meanwhile the amp works fine but then it goes on protection and I find this diode shorted.

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