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In this issue:
	Turbo Duo Sound Circuits
	Re: Turbo Duo Sound Circuits
	Re: Turbo Duo Sound Circuits

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From: d-lite@neo-geo.com
Date: Fri Jun 11 10:11:17 EDT 2004
Subject: Turbo Duo Sound Circuits


OK folks, I'm looking into the cause of the sound problems that crop up 
with Turbo Duo systems.

First off, does anyone know the cause?  I suspect it is a bad IC or cap 
in the audio circuit caused by overheating.  But I'm having a hell of a 
time locating the offending circuit or part.  If anyone can tell me at 
least which IC is the main sound processor, that would help a lot.

Also, I've asked before and only gotten one response so I'll ask again. 
  Any Duo-R or Duo-RX owners have sound issues?  I believe the problem 
is the location of the heat sink in the Turbo/PCE Duo, a problem that 
may not be present in the R and RX.



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From: duo_r@sbcglobal.net
Date: Fri Jun 11 14:20:32 EDT 2004
Subject: Re: Turbo Duo Sound Circuits


i am sorry, what is the exact problem? Is this a
headphone jack issue or a general audio problem? Any
more details you could provide?
--- owner-turbo-list@joyce.eng.yale.edu
 wrote:
 >  OK folks, I'm looking into the cause of the sound
problems that crop up 


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From: d-lite@neo-geo.com
Date: Fri Jun 11 14:30:33 EDT 2004
Subject: Re: Turbo Duo Sound Circuits


To answer Erik's question and those others might have about what I'm 
talking about, I'm addressing the lose of sound problem that seems to 
befall all US and JP Turbo Duo's.

Goes like this:
1.  CD soundtrack (not sound effects) start failing to be audible.
2.  All CD game sounds become inaudible
3.  All sound effects and music for CDs and HuCards become inaudible.

I know that a lot of Duo owners have seen this.  Generally the first 
signs are dropped music on CD games after the system "warms up", after 
20 minutes to 2 hours.  As mentioned previously, the problem seems 
isolated to Duo systems where the heat sink is very close to what I 
believe is the audio circuitry and the AV port.  I have begun 
installing a very small fan in Duo systems for people that 
SIGNIFICANTLY reduces temp at the heat sink.  Of course, it's way to 
early to tell the long term beneficial effects, but it seems to work 
well and draws about 100 mA of juice (very little strain).

So PLEASE give me input!!

On Friday, June 11, 2004, at 11:20 AM, PC Engine wrote:

 >  i am sorry, what is the exact problem? Is this a
 >  headphone jack issue or a general audio problem? Any
 >  more details you could provide?
 >  --- owner-turbo-list@joyce.eng.yale.edu
 >   wrote:
 >>  OK folks, I'm looking into the cause of the sound
 >  problems that crop up
 > 



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