All about the Roland Jupiter-series

From: kulma hattu [mailto:marleynbobi@...] 
Sent: Wednesday, September 01, 1999 4:57 AM
To: analogue@...
Subject: [AH] Jupiter-4 tuning problems.


Hiya all of you who have sometime tuned a jp4 "the way it should be done" 
eg. the Service Manual way. Well, hiya all the rest also. Got a problem:

I'm tuning my JP-4 at my school, and got to point 5. on the manual, which 
would be the VCO tune&width part. I got the tuning right on all voices, but 
didn't get the width right on the last voice (in poly-2 mode). The trimmer 
just didn't turn enough. I tried all sorts of funky stuff, re-adjusting the 
tune-trimmer, going down one octave, portamento switch, but just didn't get 
it right. Any thoughts?

/kulma


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From: Tom Moravansky [mailto:tmoravan@...] 
Sent: Wednesday, September 01, 1999 12:30 PM
To: marleynbobi@...
Cc: analogue@...
Subject: Re: [AH] Jupiter-4 tuning problems.


> 
> Hiya all of you who have sometime tuned a jp4 "the way it should be done" 
> eg. the Service Manual way. Well, hiya all the rest also. Got a problem:
> 
> I'm tuning my JP-4 at my school, and got to point 5. on the manual, which 
> would be the VCO tune&width part. I got the tuning right on all voices,
but 
> didn't get the width right on the last voice (in poly-2 mode). The trimmer

> just didn't turn enough. I tried all sorts of funky stuff, re-adjusting
the 
> tune-trimmer, going down one octave, portamento switch, but just didn't
get 
> it right. Any thoughts?
> 

If none of the components have gone bad, usually you can adjust
both the VCO frequency trimmer and the width trimmer to get a
good range out of both units.  The VCO frequency and width trimpots
interact with each other.

Also - remember the trimpots on the back of the unit.  You might
have to adjust that trim pot as well to get everything within range.

-- 

___________________________________________________________
Tom Moravansky                         tmoravan@...