Naim Nait 2 CB LED Board Need Help! - 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 5th September 2010, 11:52 AM   #1
diyAudio Member
 
hoyhoysum's Avatar
 
Join Date: Oct 2008
Default Naim Nait 2 CB LED Board Need Help!

Hi!

I just got myself a beauty, a Nait 2 recently. Cosmetically it looks good however the facia led fails on me recently. Upon opening up the case, i found that 8 nos green transparent LED mounted on a strip board drop by a resistor 8k2? I change all the LED and it works now. However it flickers according to tHe beat of music. It looks kinda cheap and i figure that it must have been modded. As i have none to compare, can anybody let me know the original how it looks like. A picture and some description is most appreciated. I would like to mod it back to the original condition..

Thanks in advance!
  Reply With Quote
Old 5th September 2010, 03:40 PM   #2
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
I don't recall my NAIT 2 having such a feature, but the picture i have says maybe it did.

dave
Attached Images
File Type: jpg NAIM-NAIT-2-inside.jpg (113.3 KB, 144 views)
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 6th September 2010, 09:37 AM   #3
diyAudio Member
 
hoyhoysum's Avatar
 
Join Date: Oct 2008
Thanks for the photo, looks like mine has been modded and it is not original.
How many leds are there and how does the led array looks like?
Do your led lights dimmed when requires to handle high dynamic levels?
  Reply With Quote
Old 6th September 2010, 11:13 AM   #4
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Any illumination either has to fed from a stabilised rail, or fed from a constant current source on the unstabilised rail to avoid brightness altering with load.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 7th September 2010, 12:14 AM   #5
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by hoyhoysum View Post
Thanks for the photo, looks like mine has been modded and it is not original.
How many leds are there and how does the led array looks like?
Do your led lights dimmed when requires to handle high dynamic levels?
That amp was a long time ago. I don't recall it having anything fancy LED wise from the front. On or off.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 7th September 2010, 06:32 AM   #6
diyAudio Member
 
hoyhoysum's Avatar
 
Join Date: Oct 2008
As for the "disco" light led i believe it must be the constant current source. Could it be the PSU caps, 6800uF 25V rubycon caps getting old? Before attempting any further diagnostic i would like to hunt for the led array fisrt. However i do not know how the array looks like, let alone the numbers of leds?
  Reply With Quote
Old 7th September 2010, 01:37 PM   #7
robmil is offline robmil  United Kingdom
diyAudio Member
 
Join Date: Jun 2004
Location: London
Hi

I don't think your one has been modded. I have had 2 of these units from NEW! The first one which was about 6 months into the production cycle blew-up due to an electrical storm nearby, the second one about a year later looked quite different inside. The first version of the Nait 2 looks more like a Nait 1 inside.

I would go for the filtering caps first but I cannot remember if the 8K resistor just comes off the transformer and not post filter caps. The NAP140 onwards have their LED supply off the transformer.

Check out your filter caps first and upgrade the regulator while you are at it. The output trannies are the equivalent of TIP41 so watch your load carefully, anything more than a pair of headphones or a pretty 'easy going' loudspeaker WILL take out the output stage!... as it heats up very rapidly under harder loads. Look for dark PCB areas near the emitter resistors and output section. It is a poor choice of output trannies by NAIM. I'm sure they could have fitted something a bit bigger and made an adequate heatsink, but I suppose the point was to make an amp that would drive a cheap pair of $300 loudspeakers.
  Reply With Quote
Old 7th September 2010, 03:53 PM   #8
diyAudio Member
 
hoyhoysum's Avatar
 
Join Date: Oct 2008
Mine is the same with the above picture but with a different led board, a stripboard with 8 green transparent led 5mm diameter. I want to mod back to the above original unit. Can anybody lead me to the type of led array used and how to wired it up.
  Reply With Quote
Old 10th September 2010, 07:17 AM   #9
robmil is offline robmil  United Kingdom
diyAudio Member
 
Join Date: Jun 2004
Location: London
The easiest thing to do is call Naim Audio and order one - if you can...otherwise drop it in to a dealer to do. It looks like a part they have made-up themselves. You could do it with veroboard BUT t all depends on what you want the final version to look like.
  Reply With Quote
Old 13th September 2010, 04:36 PM   #10
diyAudio Member
 
hoyhoysum's Avatar
 
Join Date: Oct 2008
I just wrote to Naim and they are unable to help me. I have to get the parts from my dealer in my country. That will be the last thing i will do as the cost of parts will be exhorbhitant. I rather diy it myself using stripboard/ veroboard. All i need to know is the numbers of led required or a photo showing how the led array looks like.
  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
Naim Nait-2 etsang3 Solid State 42 12th February 2011 09:35 PM
Naim Nait 1 help chris chiang Solid State 3 10th August 2009 06:03 AM
Naim Nait 1 c.d.s. Solid State 9 12th February 2008 09:22 PM
Naim nait 1 boombaxx Solid State 0 18th June 2006 02:51 PM


New To Site? Need Help?

All times are GMT. The time now is 03:56 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