Xpantastic!

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/