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Robots for Robots → General Hardware / Software Discussion → Weird Juno-106 behavior
Crackly and some sounds without any key pressed: dead VCA chip 80017A for sure.
If you replace it, yes, it will be better. Until another of the other 5 chips dies. Which it will, eventually.
There is no real way to bypass this chip, as each voice is mixed in the signal path.
I supposed you could totally desolder the broken chips, and use the good ones for spaces 1-5 as mentioned before, and play in POly2 mode.
I use MKS-7's for replacements, for the time being.
Thanks a lot teknob!
I sent an e-mail to the analogue renaisssance guy. I'm buying just one chip for now.
Soldering shouldn't be a problem. But what about the calibrations? Is it hard to do?
never done it, pretty sure you need a CRT. I brought one for this reason (and cos it looks cool in the studio), but have not got around to it yet. As mentioned before, different sounding osc's sound cool anyway.
heh... answered without seeing teknob's post on the next page...
:-)
anyway - it's not particularly easy to remove the SIP package to replace the filter/vca but it's do-able.
From memory there are some calibrations involving looking at waveforms on a CRO. but if you wanted to calibrate one new voice to the existing 5, you could probably make do with soundcard CRO software... as absolute voltage values (the major weakness of any soundcard based CRO) are less relevant then.
download the service manual off the net and have a read through the voice calibration process, and see what you think. it's not that hard. if you're capable of replacing a filter/vca ship, it should be simple.
Robots for Robots → General Hardware / Software Discussion → Weird Juno-106 behavior
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