Xpantastic!

Hi, what rev 3374s and 3372s are in the failing board?

Doug 
synthparts.com

--- In xpantastic@yahoogroups.com, Terje Winther <terje.winther@...> wrote:
>
> Hi all,
> Thanks a lot for all the help I have been given on this list. I have  
> changed parts in the power supply, some CEM chips, all those el.caps  
> who blocked tuning and sound, swapped some 74 series logic chips (so  
> now all encoders works), and got new switches and rubber feet, and  
> even a new key. And of course cleaned it up since all boards were out  
> anyway.
> The Matrix-12 is almost all right now - it is just one peculiar error  
> left:
> It seems that only one of the voice cards gets the proper commands.
> Voice 7 - 12 fails tuning of VCOs and VCFs, but all other tuning  
> passes and there is sound from all 12 voices (if I turn them on) and  
> the voices are almost in tune, and VCFs seems to work like they should.
> I also have another Matrix-12 in for service (yes, two M-12s in front  
> of me - pretty sight!), and it too reportedly have an issue with only  
> one of the voice cards working properly.
> I have double-checked the connectors (the paralell connector and the  
> two 3-4 pin connectors) and they all seems to be fine.
> Any tips on what to do if one of the voice cards don´t responds?
> 
> On another question: While having all the boards out, I noticed that  
> there are very few manual trimmers on the M-12, but there are some,  
> and I can´t seem to find any info on how to calibrate them. I have the  
> service manual, and I find the trimmers there, so I can pretty much  
> guess what to do, but it would be nice to know for sure.
> 
> 
> 
> Terje Winther
> terje.winther@...
> http://www.wintherstormer.no/
>