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Hardware News : A fix for the audio issue on Sam460ex and AmigaOne 500
Posted by m3x on 2013/2/27 10:47:27 (1625 reads) News by the same author
Hardware News

The problem with the crackling audio on some Sam460ex boards/AmigaOne 500 systems has been identified.

For some reasons, still under investigation, a few boards miss a resistor (R267)
This 0 ohm resistor is responsible for the clock source selection of the AC97 codec, without it the codec runs at a wrong frequency which causes the crackling audio.


If you have a sound quality problem with your Sam460ex board/AmigaOne system, please check if the R267 resistor is in place or not. See this photo from the bottom of the board:

Resized Image

Alternatively the problem may be mitigated with a special sm502.audio driver which minimizes (but not completely removes) the noise. Download and try this alternate driver


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Author Thread
ChrisH
Published: 2013/2/27 15:29  Updated: 2013/2/27 15:29
Home away from home
Joined: 05/19/2007
From: England
Comments: 3553
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
Good that the cause of the problem has finally been identified. But I wonder how many Sam460 boards it affects, and how they are going to get fixed...
Hans
Published: 2013/2/28 4:53  Updated: 2013/2/28 4:53
Home away from home
Joined: 01/26/2007
From: New Zealand
Comments: 2310
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
@ChrisH

ACube's own press release suggests that people contact the reseller that sold them the board. Alternatively, you could find an electronics repair shop. Or, if you're good with a soldering iron, then this would be pretty easy to do yourself.

I did a similar fix to my A1200 years ago.

Hans
Jurassicc
Published: 2013/2/28 19:23  Updated: 2013/2/28 19:25
Not too shy to talk
Joined: 11/27/2006
From: Somerset, UK
Comments: 357
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
I'm sure FOL @ amigakit or any of the soldering wizards over on amibay would be able to sort people out for those not fealing upto the job.
ddni
Published: 2013/3/1 9:11  Updated: 2013/3/1 9:11
Quite a regular
Joined: 04/10/2008
From: Northern Ireland
Comments: 970
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
This is manufacturer identified fault. Why on earth would anyone risk soldering their own board and potentially damaging it? Is the warranty valid in such situations?

I would be requesting a repair or replacement service from acube or my reseller.
Elwood
Published: 2013/3/1 11:10  Updated: 2013/3/1 11:10
Just can't stay away
Joined: 12/09/2006
From: Lyon, France
Comments: 1339
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
Why?

Because:
- ACube doesn't have the same budget as HP/Sony...
- it's faster if you do the fix yourself (if you have the skills)
- depending on where you are on Earth, it will cost a lot less doing the fix where you are instead of sending a board back and forth. And faster too!
I know Sam boards have been sold in Japan, Australia...etc. One way ticket for such expensive board is something like 100 euros!!!
ddni
Published: 2013/3/1 11:59  Updated: 2013/3/1 11:59
Quite a regular
Joined: 04/10/2008
From: Northern Ireland
Comments: 970
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
Good point on the postage. What impact will this diy repair have on warranties?
ssolie
Published: 2013/3/1 17:35  Updated: 2013/3/1 17:35
Amigans Defender
Joined: 11/26/2006
From: Canada
Comments: 986
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
@ddni
Quote:
What impact will this diy repair have on warranties?

You should do as ACube requested and contact your reseller and figure out what works best for you.

That would also mean figuring out how/if any modifications would affect your warranty.

Simple as that.
Hans
Published: 2013/3/1 21:25  Updated: 2013/3/1 21:26
Home away from home
Joined: 01/26/2007
From: New Zealand
Comments: 2310
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
@ddni
Quote:

This is manufacturer identified fault. Why on earth would anyone risk soldering their own board and potentially damaging it? Is the warranty valid in such situations?

I would be requesting a repair or replacement service from acube or my reseller.


For people like me who live on the other side of the world, sending it all the way back to either ACube or the reseller would be pretty expensive. It would be cheaper for everybody if someone locally did the fix.

I would personally have no issue doing the fix myself because I know how to use a soldering iron. I'm less likely to damage the board than a courier would if it were shipped all the way to Europe and back. Besides, the manufacturer's warranty has already expired for my board.

Of course, someone who isn't confident in their soldering skills shouldn't attempt this.

In my case, the audio already works properly, so I don't have to do anything.

Hans
graffias79
Published: 2013/3/2 19:27  Updated: 2013/3/2 19:27
Just popping in
Joined: 11/25/2009
From:
Comments: 58
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
Quick & dirty fix: Use a pencil to rub graphite on and between the pads. It works, no soldering required. Just be careful not to touch the other resistors with the "artwork".
COBRA
Published: 2013/3/12 3:47  Updated: 2013/3/12 3:47
Not too shy to talk
Joined: 11/24/2006
From:
Comments: 370
 Re: A fix for the audio issue on Sam460ex and AmigaOne 500
I can also do this fix for people locally (in Auckland) so I think we have it pretty well covered in New Zealand... ;)
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