SV: [sdiy] broken oberheim matrix 6r

[karl dalen]

Have you checked the 8253 timer?

If these dont work you wont get any sound!

KD

 for the  os
--- Danjel van Tijn <syntheticdan at gmail.com> skrev:

> Hi Guys,
> 
> I tried to send this out a while ago but the list was onbiously down.
> I recently took a gamble to buy a broken Oberheim matrix 6r.
> The unit turns on, receives midi but no sound out. I thought it might
> be a problem with corrupt memory data but no amounts of resets or self
> callibration have worked (nor has re-programming voices from a PC).
> When I run callibration I get the following errors:
> Bad Wave 63
> Bad Res 63
> Bad VcF 63
> which basically means that all the voice chips are failing the callibration.
> 
> I have tried re-seating all connectors, cleaning the pins of the
> cem3396 chips (in case of oxidation), I checked all power rails and
> have tried to trace through signals with a scope.
> It looks like the CEM3396 chips are receiving the appropriae
> corresponding signal changes (e.g. if I edit a parameter I see changes
> at the inputs of a voice chip). However, the refference signal to the
> chip is very very low amplitude and saw haped. Also I get no audio out
> of the voice chips.
> 
> What are the chances that all 6 voice chips spontaneously died? I have
> ordered a sigle replacement chip to see if that makes a difference for
> a single voice.
> 
> Any other clues as to what may be wrong???
> 
> thanks!
> Danjel
> 
> -- 
> www.intellijel.com
> www.myspace.com/intellijel
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
Flyger tiden iväg? Fånga dagen med Yahoo! Mails inbyggda
kalender. Dessutom 250 MB gratis, virusscanning och antispam. Få den på: http://se.mail.yahoo.com