Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Faulty NAD 4100 Tuner - help & suggestions needed
Faulty NAD 4100 Tuner - help & suggestions needed
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
Thread Tools Search this Thread
Old 7th May 2009, 10:39 PM   #1
stevecole is offline stevecole  United Kingdom
diyAudio Member
Join Date: Apr 2008
Default Faulty NAD 4100 Tuner - help & suggestions needed

I purchased this tuner for next to nothing in a faulty condition as a repair project, for something to tinker with, and maybe to learn a little while I'm at it. The price paid was extremely low, so I can't justify spending much on it. The AM section is fine, but FM is not so good. It will seek and find stations with little more than a short wire attached to the aerial terminals, which suggests to me that the front end is OK. However it will only go into stereo on very strong signals, even when fed from my rooftop aerial. Mono reception is clear but very faint, but when it does go into stereo you get a what I can best describe as a 'Dalek' effect on human voice.

Inside I can see a LA3401 stereo demodulator IC, which, in view of the above symtoms, is the obvious thing to replace. I see from the datasheet that this device remains in circuit for AM reception, and since this part of the unit still works I guess the 3401 can't be totally dead. Before I adopt the highly un-scientific approach of just changing the IC, can anyone suggest a few basic checks I could do, to prove the health or otherwise of this device? I have a DMM, and can borrow an oscilloscope if that would help to make a diagnosis.
  Reply With Quote


Faulty NAD 4100 Tuner - help & suggestions neededHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tuner LPF Korin BL-13 needed 2ndserve Parts 0 14th April 2009 04:44 PM
FM tuner suggestions xxguitarist Analogue Source 13 13th March 2009 05:46 PM
denom pma250 amp faulty,but no faulty parts found please help homertooties Solid State 1 7th December 2008 04:58 PM
Help needed with faulty speaker! harrygrey382 Full Range 6 13th July 2006 09:13 AM
Help needed for JVC FX1100BK tuner earsandeyes Analogue Source 3 20th November 2005 10:06 PM

New To Site? Need Help?

All times are GMT. The time now is 08:25 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio