All about the Roland Jupiter-series

-----Original Message-----
From: DrTempus [mailto:drtempus@...]
Sent: Thursday, June 22, 2000 12:41 AM
Cc: synth-diy@...; analogue@...
Subject: [AH] Re: Jupiter-8 part needed FIXED!


Thanks everyone for replying!

When Tony Allgood mentioned the SH-09, it made me think of a dead RS-09
I have,
and I decided to make it more dead. ;-). (Didn't realize it had the
BA662A
in it. I replaced it and now I have all 16 VCOs firing, YAY!, of course
I'm not done, 2 minor problems to knock out now.

1) VCO2 sine waveform noisy
2) VOICES A,B,C,D sound brighter than VOICES E,F,G,H. I assume this
is narrowing the problem to a MODULE CONTROLLER, which one,
I not sure.


Thanks again!

I'm slowly getting closer to being ready for a midi kit.

-Allen
www.darkaether.net

Trevor Page wrote:

>
> Hi,
>
> I recently obtained a number of BA662A's from Roland in the UK without
> problems - but I did have to specify a Jupiter 8. So there's plenty in the
> UK branch. Their computer came up with nothing when I specified the part
> number that appears in the TB303's user manual.
>
> Trev
>
> ----- Original Message -----
> From: Tony Allgood <oakley@...>
> To: DrTempus <drtempus@...>; <synth-diy@...>
> Cc: <analogue@...>
> Sent: Tuesday, June 20, 2000 10:29 PM
> Subject: Re: Jupiter-8 part needed
>
> > Hi all,
> >
> > Allen wrote> I am looking for Roland part number 15229802 generally
> > called: BA662A or B. Roland US said they don't have any.
> >
> > Do try Roland again. Certainly Roland UK did have them the last time I
> > looked. But try asking for BA662 and say it comes from a SH-09. The part
> > number computer at Roland UK can be very peculiar. Certainly if you ask
> > for BA662 from a TB303, you get no supply. A JP8, however, comes up
> > trumps. If the JP8 has failed this time, try another synth.
> >
> > On the other hand, it is not difficult to get a BA6110 made by R-Ohm to
> > fit. This is an updated and improved part, the orignal 662 was made by
> > R-Ohm for Roland it seems. It has different pin out but it is possible
> > to use the new part with a bit of a cludge.
> >
> > You have to handy with a soldering iron to do this. See the 2nd page of
> > the TB3030 schematics on my site for details on this. This shows how
> > either part can be used to make a typical Roland VCA. The BA662 and 6110
> > do sound the same, so long as you don't use the compensation network in
> > the input of the BA6110.
> >
> > www.techrepairs.freeserve.co.uk/projects.htm
> >
> > Regards,
> >
> > Tony Allgood Penrith, Cumbria, UK
> >
> > Modular synth circuits, TB303 clone and Filter Rack
> >
> > www.techrepairs.freeserve.co.uk
> >
> >
> >
> >
> >
> >
> >
> >
> >

-----Original Message-----
From: Mike Kent [mailto:mikekent@...]
Sent: Thursday, June 22, 2000 1:12 AM
To: DrTempus; Analogue Heaven
Subject: Re: [AH] Re: Jupiter-8 part needed FIXED!

> 2) VOICES A,B,C,D sound brighter than VOICES E,F,G,H. I assume this
> is narrowing the problem to a MODULE CONTROLLER, which one,
> I not sure.

I had the same probelm with my JP-8 #1 recently. It was easily fixed, I
reseated the ribbon cables inside, it was just a case of a dirty connection
on the cable between the module controller board and the voice boards.

If you've opened yours to replace the VCO part recently, you may have
already done that. But try it before getting too far into diagnosing in a
deeper way and looking for a more difficult problem.

Regards,
Mike.


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