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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 14th June 2019, 01:42 PM   #11
Jabbejokker is offline Jabbejokker
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Quote:
Originally Posted by WimJanse View Post
@ergo

Thanks a million for this, I'm suffering with this problem for a year now.
The C390DD went for a repair last year, but problem was never resolved.

Sometimes the C390DD boots up in one go, sometimes I have to retry for a few times (2-10) before the C390DD starts up.

I'll order the capacitors right now, will do a replace somewhere next week.

Thanks again,
Wim
How do you know which caps to use? Is the part number written on them?
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Old 14th June 2019, 01:51 PM   #12
WimJanse is offline WimJanse
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Look at the top of this post, it gives the schematics, pcb layout and caps particulars in the first posting by ergo
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Old 14th June 2019, 02:22 PM   #13
Jabbejokker is offline Jabbejokker
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Where is the part number? Will any capacitor of same size and value work or should I get the specific type? I’m thinking maybe temperature tolerances or “grades” may differ. Forgive my ignorance.
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Old 14th June 2019, 02:39 PM   #14
Khron is offline Khron  Finland
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You'll want "low-ESR" ones, and preferably from a Japanese brand (Panasonic/Matsushita, Elna, Rubycon, Nichicon, United ChemiCon).

For "future-proofing", i'd also replace C217 and maybe C213.
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Old 14th June 2019, 02:41 PM   #15
Jabbejokker is offline Jabbejokker
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Thank you!
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Old 14th June 2019, 02:50 PM   #16
WimJanse is offline WimJanse
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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
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Old 14th June 2019, 10:31 PM   #17
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
What you does the cd263(x) mean? I bought these. Are they the right ones?

https://www.mouser.com/datasheet/2/3...60-1391675.pdf
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Old 14th June 2019, 11:36 PM   #18
Khron is offline Khron  Finland
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"CD263" kinda-sorta reminds me of markings i've seen on some no-name electrolytics in several cheap devices.

Those Panasonic FP's should do the job nicely, though.

Edit: Might've found something about CD263(X).

http://www.jianghaius.com/PDF/CD263-1.pdf
http://www.jianghaius.com/PDF/CD263-2.pdf

Dunno about you, but i'd take all those specs with a bucketload of salt...
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Last edited by Khron; 14th June 2019 at 11:40 PM.
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Old 15th June 2019, 05:41 AM   #19
WimJanse is offline WimJanse
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@jabbejokker

Same as I bought, panasonic elco’s
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Old 15th June 2019, 11:01 PM   #20
Jabbejokker is offline Jabbejokker
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Ok sounds good. So don’t worry about CD263?
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