Hi, what rev 3374s and 3372s are in the failing board?
Doug
synthparts.com
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--- In xpantastic@..., 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@...
