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Class D Switching Power Amplifiers and Power D/A conversion

NAD C390DD (C 390DD) does not power on failure with fix
NAD C390DD (C 390DD) does not power on failure with fix
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Old 16th June 2019, 10:05 AM   #21
Khron is offline Khron  Finland
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If anything, avoid it / them
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Old 18th June 2019, 02:17 PM   #22
Jabbejokker is offline Jabbejokker
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Quote:
Originally Posted by WimJanse View Post
From the parts-list
Alu Electrolytic Capacitor
CD263(X), 1000uF, 25V, 20%
C210 C211

Alu Electrolytic Capacitor
100uF, 25V, 20%,105 degrees
C204 C205

Be award, the pcb is two sided, soldered throug and through
Hope this helps
How do you solder two sides PCB?
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Old 19th June 2019, 03:18 AM   #23
Khron is offline Khron  Finland
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I'm guessing the warning was more for the desoldering-the-stock-caps part.

In the sense that you'd need a beefy-ish iron (and tip), and not be too ham-fisted about it, or you might pull out the caps complete with the through-hole plating, and give yourself a whole new set of headaches...
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Old 5th July 2019, 05:38 PM   #24
Henk is offline Henk  Netherlands
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I have had the C390DD since mid 2014 and it has had the problem of occasionally not switching on from the beginning. Actually I thought this was a software issue, because doing a 'hard reset' using the switch on the back always solved the issue. It didn't happen very often so it was not a big issue, although a bit of a nuisance. In 2015 something went wrong in the power supply. When I switched the amp on, my circuit breaker in the house tripped and I had to send the amp for repair. The SMPS was replaced, but unfortunately it did not solve the issue of sometimes not switching on. Back then I also searched the web for more information, but did not find anything. Recently, switching on the amp became impossible. Also using the switch on the back did not help. I did a new google search which almost immediately led me here. Apparently this is a common problem with this amplifier. By the way, I also found the service doc, so if someone is interested I can upload it. Seems they drew the schematics in Altium, which is one of the better tools in my opinion.

I plan to look at this more into detail, but first I have a question, mainly to Wim Janse and Jabbejokker: Did replacing the capacitors by the types mentioned solve the issue for you?
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