All about the Roland Jupiter-series

Hi all,

I have a faulty vco2 on the main voice board of my jp-6. After power-
up, (in split 2-4 mode) the fourth key depressed produce no sound from 
the vco2 so I assumed that the voice #4 is faulty. The next fouth key 
will be faulty , and so on. Are there diagnostic functions I can use 
to confirm my suspicions? The service note does not talk much about 
faulty voices...

Regards,
Denis