NAD 3020A repair. Low output levels

Roggg · 4th January 2009, 04:40 PM

Hi Guys,

I bought a NAD CD player for my home hi-fi and the vendor threw in his amp too (NAD 3020A). This was about a year ago and having briefly tested the amp and found it not to work it has been sitting in a box since.

I now have a need for the amp so have some motivation to fix it up. The problem is that the outputs are very low. It does play sound, but is only just perceptible at full volume; it is louder with the line voltage inputs connected directly to the speakers! Not much of an amp..

I'd be really grateful if anyone could point me in the right direction.

Thanks in advance,

Rog.

Stuey · 5th January 2009, 07:45 AM

Not being clever, but does it have the pre to main jumpers fitted on the rear sockets?

Edit: I think it has these...

planet10 · 5th January 2009, 07:52 AM

This will be helpful

http://homepage.mac.com/planet10/man...viceManual.pdf

dave

Roggg · 6th January 2009, 04:23 PM

Thanks a lot for the replies. Much appreciated.

Stuey
If by the jumpers you mean a connector placed between the RCA Preamp out and LAB in connections, as pictured in the manual planet 10 kindly posted, then no. There is no such connector on my amp. I'm not sure if this is what you're referring to - i can't find anything else that looks obviously like a jumper either.

Planet10
Thanks a bunch for the great manual. This is much better than the service manual I found before.. but i still can't figure out what's up with my amp

any other ideas much appreciated!

Would it be worth my trying to use it as a preamp for my other amp to narrow down the fault possibilities?

Thanks again!

Rog.

Roggg · 6th January 2009, 04:23 PM

It has just occurred to me that perhaps you (Stuey) mean that it should have these jumpers fitted..?

I guess as that's how it's pictured in the manual with no reference to it, perhaps that is the case.. I shall hunt around for something suitable to link them together with...

planet10 · 6th January 2009, 04:52 PM

Quote:

Originally posted by Roggg
It has just occurred to me that perhaps you (Stuey) mean that it should have these jumpers fitted..?

Yes. That is how the output from the preamp gets to the power-amp. The steel jumpers typically aren't as good as a decent patch cord (you might want to make up a short onr specifically for the job)

A common mistake (one i've made many times)

dave

Roggg · 6th January 2009, 07:56 PM

Awesome! It works! Thanks a bunch. This is far easier than any fix I had imagined would be necessary! I would never have worked that out without you!

Why don't they label the back of the blumin amp though!? humph!

(blaming others for my own failings is much easier than blaming myself

All the best,

Rog.

planet10 · 6th January 2009, 08:54 PM

Quote:

Originally posted by Roggg
Why don't they label the back of the blumin amp though!? humph!

They do...

Normal In | PreAmp Out | Lab In (use Normal In)

dave

Stuey · 6th January 2009, 11:56 PM

Excellent!

4th January 2009, 04:40 PM	#1
Roggg diyAudio Member Join Date: Jan 2009	NAD 3020A repair. Low output levels Hi Guys, I bought a NAD CD player for my home hi-fi and the vendor threw in his amp too (NAD 3020A). This was about a year ago and having briefly tested the amp and found it not to work it has been sitting in a box since. I now have a need for the amp so have some motivation to fix it up. The problem is that the outputs are very low. It does play sound, but is only just perceptible at full volume; it is louder with the line voltage inputs connected directly to the speakers! Not much of an amp.. I'd be really grateful if anyone could point me in the right direction. Thanks in advance, Rog.

5th January 2009, 07:52 AM	#3
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	This will be helpful http://homepage.mac.com/planet10/man...viceManual.pdf dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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5th January 2009, 07:45 AM	#2
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Not being clever, but does it have the pre to main jumpers fitted on the rear sockets? Edit: I think it has these...

6th January 2009, 04:23 PM	#4
Roggg diyAudio Member Join Date: Jan 2009	Thanks a lot for the replies. Much appreciated. Stuey If by the jumpers you mean a connector placed between the RCA Preamp out and LAB in connections, as pictured in the manual planet 10 kindly posted, then no. There is no such connector on my amp. I'm not sure if this is what you're referring to - i can't find anything else that looks obviously like a jumper either. Planet10 Thanks a bunch for the great manual. This is much better than the service manual I found before.. but i still can't figure out what's up with my amp any other ideas much appreciated! Would it be worth my trying to use it as a preamp for my other amp to narrow down the fault possibilities? Thanks again! Rog.

6th January 2009, 07:56 PM	#7
Roggg diyAudio Member Join Date: Jan 2009	Awesome! It works! Thanks a bunch. This is far easier than any fix I had imagined would be necessary! I would never have worked that out without you! Why don't they label the back of the blumin amp though!? humph! (blaming others for my own failings is much easier than blaming myself All the best, Rog.

6th January 2009, 11:56 PM	#9
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Excellent!

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