All about the Roland Jupiter-series

-----Original Message-----
From: kripto [mailto:e.campus@...]
Sent: Wednesday, June 06, 2001 7:38 PM
To: analogue@...
Subject: Re: [AH] Re: jupiter 8 adsr



Luís Marka wrote:

>
>         Hi,
>         You probably have a blown ADSR generator chip. It's a custom
Roland
> IC, IR3R01.
>         To be sure if this chip is really fried, you'll have to
measure the
> voltage in its output pin, and check if it's acting as expected (0 to
+10v,
> according to the envelope shape). If it´s OK, you´ll have to follow
the
> signal path until find out what´s wrong. I think it´s only possible
with
> schems at hand... you know, Jupiters are complex machines.

After initial panic, I've spent some time on the jupiter and I found
that my
initial description was uncorrect:

Is not true that no one of the adsr2 parameters works, cause if I set
the vca
control amount to max, than Release works as a sort of aftertouch, cause
the
overall volume is near zero, and also Attack works (I hear a little
progressive
increase of volume, not just the "click" that I got when Attack is set
to 0. I
think that probably even Decay works, but I can't hear it cause the too
low
volume...
So: it looks like only the Sustain doesn't work (only one voice)..
Do you still think that could be a faulty IR3R01.?

Suggestions welcome!
thanks
E.Campus