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melzarb 19th March 2013 01:19 AM

Diodes in SPL Dinamics ext-3000D
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

:cop: 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?

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