NAD 3020 problem - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th December 2007, 10:50 AM   #1
diyAudio Member
 
Join Date: Jul 2007
Default NAD 3020 problem

I have a problem with my NAD 3020a , it seems that the woofer on the left channel moves bigger than the one on the right channel. but both sides seems to have the same volume.
I have tried, the problem comes from the pre-amp part, what could possibly cause this problem?
  Reply With Quote
Old 10th December 2007, 11:12 AM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Hi, Does it sound wrong. Lacking in Bass etc. What tests have you done. Are you sure it is Pre-Amp. Are all inputs affected.
Regards Karl
  Reply With Quote
Old 10th December 2007, 01:04 PM   #3
diyAudio Member
 
Join Date: Jul 2007
yep, less bass than the other channel, I've tried to connect the pre amp out to another amp. so I know it's the pre amp's problem
  Reply With Quote
Old 10th December 2007, 04:44 PM   #4
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Hi, It can only be a capacitor that has gone low in value.Have you got a schematic ? IF you have no test equipment get a 47mfd 63volt capacitor (or anything thereabouts 10 mfd 100mfd it dosent matter) and bridge any coupling caps in the Pre-Amp one at a time (Keep volume low and connect right way round).If you have circuit can tell you which ones to check.Just a thought, nothing like an open circuit pot on the tone controls ?
Regards Karl
  Reply With Quote
Old 10th December 2007, 09:55 PM   #5
diyAudio Member
 
Join Date: Jul 2007
hi, yes, I have the circuit , which one should I check?
  Reply With Quote
Old 10th December 2007, 09:59 PM   #6
diyAudio Member
 
Join Date: Jul 2007
Click the image to open in full size.
  Reply With Quote
Old 10th December 2007, 10:14 PM   #7
rdf is offline rdf  Canada
diyAudio Member
 
rdf's Avatar
 
Join Date: Jun 2004
Location: big smoke
Hi vubkevin. For 6 electrolytic caps just replace them all and enjoy it for another 20 years. I recently did the same to a Rotel RX-980 bought cheap and it was worth the effort. Don't forget the PS caps, electrolytics have advanced spectacularly since that amp left the showroom. Worth the minimal cost.
__________________
Ears aren't microphones.
  Reply With Quote
Old 10th December 2007, 10:22 PM   #8
diyAudio Member
 
Join Date: Jul 2007
which 6 electrolytic caps should I replace? just want to narrow where is the problem, I donno how to read the circuit, and donno which cap effects the bass
  Reply With Quote
Old 10th December 2007, 10:41 PM   #9
rdf is offline rdf  Canada
diyAudio Member
 
rdf's Avatar
 
Join Date: Jun 2004
Location: big smoke
C401, C402, C409, C410, C417 and C418. If you're new to this make sure the negative sign on the replacement caps are in the direction as the ones you remove. Is the bass problem only on records? The schematic you posted is for the phone pre.
__________________
Ears aren't microphones.
  Reply With Quote
Old 10th December 2007, 10:45 PM   #10
diyAudio Member
 
Join Date: Jul 2007
oh? then does anybody has the pre-amp schematic for NAD3020a?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Another NAD 3020 jerryo Solid State 17 3rd May 2012 06:39 PM
hum problem in NAD 3020 (help wanted) garyk Solid State 7 12th August 2008 04:50 PM
NAD 3020 input jack problem ychousa Solid State 4 8th February 2007 05:52 PM
NAD 3020 Channel Problem GhettoSQ Solid State 9 19th December 2006 10:53 AM
NAD 3020 Problem diddytong Solid State 7 22nd July 2005 04:15 PM


New To Site? Need Help?

All times are GMT. The time now is 07:37 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2