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 24th August 2008, 08:33 PM   #1
diyAudio Member
 
Join Date: Aug 2008
Default NAD 917/2100 problem

Hi,

Please excuse if this has been covered, but I couldn't find an answer to my question using several search criteria.

I'm using an NAD 917/2100 PE combination to push two JBL studio monitors. I've had the amp and pre-amp since new. Recently one or the other channel has been going dead. Turning the volume up usually causes the dead speaker to come back on immediately, although sometimes it takes two or three rotations of the volume control to get it back on.

I assumed it's a dirty pot, but reading some of the forums I've seen discussion of other problems these units experience as they age. Any recommendations greatly appreciated.

Thanks

~ Blacky B.
  Reply With Quote
Old 24th August 2008, 09:06 PM   #2
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
you should

1. disconnect, de-solder, the volume potentiometer

This is usually one DUAL Logaritmic special 'volume pot'.

People told me, that there are some spray or chemical oil/grease
that can be used onto the carbon resistive surfaces.
To fix them a bit.
If is only dirty carbon layer and/or moving metal wipers
you may get it work perfectly alright again
.

Otherwise you could consider find one Replacement pot = same size & value.
First search should be at the closest NAD website = Support/Service/Contact.



2. dirt or just worn out and damaged carbon layer.
Potentiometers, especiall those most used = The Volume Control Pot
will have a limited life.
This is specified as:
---> minimum guarantee,
Number of turnings (like 5000, or 10000 operations)

Cabon, Cole, as in one carbon pencil pen you write with
(charcole also used by painters when drawing in black & white )
will be scratched and carbon will go away, like black dust.

Same way with carbon layer pots.
They will eventually no more have a carbon contact to the metal wiper.
And when this happens, there will not be any sound from this particular area of the cole layer.
__________________
lineup
  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
Help! NAD 2100 schematic vubkevin Solid State 21 13th April 2012 06:56 PM
NAD 2100 power amp LeoJar Solid State 1 5th June 2008 09:32 AM
Xplod 2100 GTX Problem Heed_20 Car Audio 3 30th March 2007 04:32 AM
Mcx-2100 Img Stageline titoon Parts 0 25th August 2006 11:01 PM
C.E.C. 2100 tweaking Kollega Digital Source 0 18th May 2002 09:31 AM


New To Site? Need Help?

All times are GMT. The time now is 04:19 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