naim CD3 repair

distortion · 23rd August 2009, 01:27 PM

hello to all
can someone help me?
the problems is the left channel audio has gone 'wooley' and muffled
must checking the capacitors or truth solder?
the schematics of IV stage?
someone have schematics
some proposal?

ApogeeLover · 23rd August 2009, 02:50 PM

Quote:

Originally Posted by distortion

hello to all
can someone help me?
the problems is the left channel audio has gone 'wooley' and muffled
must checking the capacitors or truth solder?
the schematics of IV stage?
someone have schematics
some proposal?

Oooh..soundz like someone's bought a dodgy Naim off Ebay ?!

distortion · 23rd August 2009, 05:26 PM

Quote:

Originally Posted by ApogeeLover

Oooh..soundz like someone's bought a dodgy Naim off Ebay ?!

perhaps

johnm · 23rd August 2009, 08:38 PM

Sounds like the DAC chip is on its way out

You could try posting for help over at the Pink Fish Media website (which is full of knowledgeable Naim fans):

http://www.pinkfishmedia.net/forum/

...or get in touch with Les at Avondale Audio for repair quote/information:

http://avondaleaudio.com/contact/

Hope this helps

- John

Mooly · 24th August 2009, 06:08 AM

You need to use a scope to check where the problem lies. You are just guessing otherwise.
Failing that locate the output pin/s of the DAC/s, desolder and swap the left/right channels over. That will prove if the fault is in the analogue or digital stages.

distortion · 24th August 2009, 11:39 AM

i'm trying to use scope to check block by block from psu to output stage.
will post some photos.
anyone has tested the nos mods or lampization or flea clock update?
it's only a suggest.

distortion · 01:24 PM

beginning discover something
checking the schematics previously use scope

distortion · 26th August 2009, 08:30 PM

OK. Working full.
My opinion: the sound is strange: almost one of the best cdp i have lissen.
Defect was a faulty opamp (is the firt time for me find a very simple and anomalous leakage).
sobstituted the opa604ap with opa627bp (more dark sound and better treble, bass with enormous difference in positive).
the circuit is very simple.
the na-cd vs cd-650 half tuned, and cd150 fully tuned is a bit step up, some armonics is lost maybe. cd150 with nos convertion and fake SRPP AD825-6524 sound more armonics.
the decision very difficult now is if the nos convertion is better and if the opa replacement is the better way.
tomorrow hard listening (today 34°C and 100% rh)!!! tooo hottt

ApogeeLover · 26th August 2009, 09:58 PM

Quote:

Originally Posted by distortion

tomorrow hard listening (today 34°C and 100% rh)!!! tooo hottt

Oh my heart bleeds for you !! Jammy sod - it's rained for almost all of the two weeks I've had off from work.

However... on another note - congrats on solving your problem !!

It's always a good feeling when something goes right eh?

distortion · 27th August 2009, 04:21 PM

http://i864.photobucket.com/albums/a..._2010/test.jpg

OK. Another test was passed. Confirm the good value of naim Na-CD3.
I've opted for the operational OPA627AP and NOS.

I must say that the omega3-clone with t-amp and CD3 really good! (extension, air, sondstage) recommend! The rest of the listening chain is: nait2 and Kan Mk1 (can see in photos).
But it is too too hot. (33°C and 100% rh), need rain!!!
Actually the circuit of CD3 is very simple and very clean. When the layout and components are truly works wonders quality straordinary.

23rd August 2009, 01:27 PM	#1
distortion diyAudio Member Join Date: Sep 2003 Location: Rimini	naim CD3 repair hello to all can someone help me? the problems is the left channel audio has gone 'wooley' and muffled must checking the capacitors or truth solder? the schematics of IV stage? someone have schematics some proposal?

26th August 2009, 01:15 PM	#7
distortion diyAudio Member Join Date: Sep 2003 Location: Rimini	beginning discover something checking the schematics previously use scope Last edited by distortion; 26th August 2009 at 01:24 PM.

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23rd August 2009, 08:38 PM	#4
johnm diyAudio Member Join Date: Sep 2003 Location: Hampshire	Sounds like the DAC chip is on its way out You could try posting for help over at the Pink Fish Media website (which is full of knowledgeable Naim fans): http://www.pinkfishmedia.net/forum/ ...or get in touch with Les at Avondale Audio for repair quote/information: http://avondaleaudio.com/contact/ Hope this helps - John

24th August 2009, 06:08 AM	#5
Mooly diyAudio Member Join Date: Sep 2007	You need to use a scope to check where the problem lies. You are just guessing otherwise. Failing that locate the output pin/s of the DAC/s, desolder and swap the left/right channels over. That will prove if the fault is in the analogue or digital stages.

24th August 2009, 11:39 AM	#6
distortion diyAudio Member Join Date: Sep 2003 Location: Rimini	i'm trying to use scope to check block by block from psu to output stage. will post some photos. anyone has tested the nos mods or lampization or flea clock update? it's only a suggest.

26th August 2009, 08:30 PM	#8
distortion diyAudio Member Join Date: Sep 2003 Location: Rimini	OK. Working full. My opinion: the sound is strange: almost one of the best cdp i have lissen. Defect was a faulty opamp (is the firt time for me find a very simple and anomalous leakage). sobstituted the opa604ap with opa627bp (more dark sound and better treble, bass with enormous difference in positive). the circuit is very simple. the na-cd vs cd-650 half tuned, and cd150 fully tuned is a bit step up, some armonics is lost maybe. cd150 with nos convertion and fake SRPP AD825-6524 sound more armonics. the decision very difficult now is if the nos convertion is better and if the opa replacement is the better way. tomorrow hard listening (today 34°C and 100% rh)!!! tooo hottt

27th August 2009, 04:21 PM	#10
distortion diyAudio Member Join Date: Sep 2003 Location: Rimini	http://i864.photobucket.com/albums/a..._2010/test.jpg OK. Another test was passed. Confirm the good value of naim Na-CD3. I've opted for the operational OPA627AP and NOS. I must say that the omega3-clone with t-amp and CD3 really good! (extension, air, sondstage) recommend! The rest of the listening chain is: nait2 and Kan Mk1 (can see in photos). But it is too too hot. (33°C and 100% rh), need rain!!! Actually the circuit of CD3 is very simple and very clean. When the layout and components are truly works wonders quality straordinary.

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