[sdiy] Roland Jupiter 8 repair

[Luis de Freitas]

Hello , 

I know this may be a bit OT but is there anybody familiar with the Roland Jupiter 8 on a repair level ....??? 

I got one with a couple problems and could use some tips to get it back to shape ..... 

As far as I can notice it has the following issues : 

On POLY 1 mode some keys don't seem to work ... the inoperative keys are spread along the scale and they seem to follow some patern .... 
All the keys work on POLY 2 , SOLO and UNISON modes ... 

There is also a high pitched sound along with some notes or chords , this either in POLY 1 or POLY 2 modes ..... 

I have the service manual but quite frankly I don't have a clue where to look for this malfunction .....

Regards 

Luis
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