Diodes in SPL Dinamics ext-3000D - diyAudio
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Old 19th March 2013, 01:19 AM   #1
melzarb is offline melzarb  Malta
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Default 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.
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Old 19th March 2013, 05:09 AM   #2
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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.
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Old 21st March 2013, 10:15 AM   #3
melzarb is offline melzarb  Malta
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Just did as you said Perry. Sorry for the mess.
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Old 21st March 2013, 11:30 AM   #4
Pano is offline Pano  United States
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Old 21st March 2013, 12:29 PM   #5
melzarb is offline melzarb  Malta
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Thanks Pano. Hope someone can help!!
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Old 21st March 2013, 04:19 PM   #6
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Maybe a close up pic of the diodes and/or of the board location might help someone to identify them for you.
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Old 21st March 2013, 05:01 PM   #7
melzarb is offline melzarb  Malta
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There is nothing written on these diodes but I will send a pic
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Old 21st March 2013, 08:42 PM   #8
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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.
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Old 22nd March 2013, 06:28 AM   #9
melzarb is offline melzarb  Malta
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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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Old 22nd March 2013, 12:39 PM   #10
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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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