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Am 31.12.2010 19:04, schrieb thorkvande:
O.k.Hey,
Thanks for knowledgeable replies!
Just to clarify as well, the mini in question works well and is calibrated, ie plays in tune.
Well,- before you solder inside, you trely ave to know what to do and how.
I have some experience in restoring and adjusting rhodes, wurlitzers and clavinets, and used to calibrate my old Korgs every now and then.
In terms of disconnecting the MIDI board, however, I dont feel competent enough to start soldering in there. And there's no need to, as the mini works fine!?!
I`d say, if you want to find out how that unknown MIDI interface works and why it doesn´t actually,- putting it out and doing ates w/ another one isn´t a bad idea.
Just to make it clear, you have a CV system already !
Anyway, you may be right, it would be worth it to get a CV system, the expert sleepers or Motu ones look interesting. I was just curios if anyone had a similar mini-MIDI mod, and knew the functionality. I think it is possible to calibrate the MIDI section separately, and thus have both MIDI and keyboard section in working condition.
All these MIDI interfaces for analogue synths translate incoming MIDI to Control-, Gate- and Modulation voltages,- and now we come to the soldering job:
You have a Minimoog D manual for THIS Minimoog D,- just because there were different board layouts especially for the OSC board existing and some worked w/ buffer boards and some not, had more or less trimmers to calibrate OSCs.
In the Minimoog D manual are schematics.
If you don´t have ´em, you´l find manuals and a service manual in the Lords of the Mini Yahoo group.
If you look at these schematics while following the wires going from your MIDI interface to the circuit boards of the/your Minimoog,- you should be able to recognize it´s all connected to some "contacts" which receive CVs and trigger signals.
It also can even be simpler with all related wires being connected internally to the OSC. /VCF and VCA connectors you see on the rear of the Mini as well as to the switch trigger connection.
That´s not hi-tech, man.
Label the wires and notate where they had been soldered to before you desolder them,- so you can easily reverse your procedure later.
Then check out if there are connections interupted and solder bridges until the Mini works without any modification.
Can´t be so difficult and if, every radio/TV tech can do that job for you.
If the Mini works alone,- and with another Midi interface connected to the standard connections on the rear panel,- you possible find out what´s wrong w/ the actually built in interface more easy.
Again,- there´s NO Midi being send from your Midi interface to the Mini,- there have to be valid CV and trigger signals at the outputs of the Midi interface.
If the Midi interface receives MIDI doesn´t matter for the Mini to play over MIDI,- it needs valid CV and Gate signals.
Well, the easiest to restorate vintage instruments are these without mods.
The MIDI on the mini is of course secondary, I just have a slight brain damage that means I get pleasure from restoring old electric instruments, with or without mods... Maybe if Im presented with lots of extra time I'll sit down and solve the riddle. Would have to be next year!
Restore both separately, the Mini 1st and if you´re sure the interface is working, it´s the 2nd step.
Maybe it´s trashed.
I actually have a synth here which receives MIDI,- the processor receives MIDI,- but it doesn´t play any audible tone even all the output stuff is working.
Partially damaged processor,- rare and hard to find chip.
There are chips on your MIDI interface and you 1st have to know what these do.
ditto
Happy 2011 everyone!
P.
Thor