All about the Roland Jupiter-series

-----Original Message-----
From: Pratt Winkle [mailto:prattwink2@...]
Sent: Saturday, August 12, 2000 1:32 AM
To: analogue@...
Subject: [AH] Jup 6 VCO help


Does any one know if the 3340 used in the Jup-6 needs
to be a modified chip (white dot mark on it)? My tech
seems to think so. He put a normal 3340 in and could
not get it to tune. It is an issue because when my
Jupiter 6 is in poly 1 mode, vco 2 skips a voice
every sixth note played.

======================================================
sorry if you have gotten this question over and over.
I cannot tell if it is posting.

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-----Original Message-----
From: kennyb@... [mailto:kennyb@...]
Sent: Saturday, August 12, 2000 3:45 AM
To: analogue@...; prattwink2@...
Subject: Re: [AH] Jup 6 VCO help

> Does any one know if the 3340 used in the Jup-6 needs
> to be a modified chip (white dot mark on it)? My tech
> seems to think so. He put a normal 3340 in and could

I do not think that it is a modified chip. It should just
be a 3340. Perhaps someone else on this list can shed light
on the 3340 (Paul Schrieber perhaps????)

> not get it to tune. It is an issue because when my
> Jupiter 6 is in poly 1 mode, vco 2 skips a voice
> every sixth note played.

When you say skips a voice you mean does not play right?
It sounds like your tech figured out which voice board
and which voice is the problem right?

Now the problem is that you cannot tune that one voice with
the new CEM. I have a Jupiter-6 but have not yet had
this problem. I did however have exactly this problem on
my 6-Trak. One of the CEM's blew, I replaced it with
another and the voice was out of wack. I then replaced
it again and the third one was A-ok. The reason? The
second one was also blown or somehow blew while I was
installing it but still kinda barely worked.

Does your tech have the full service manual and schematics?
The calibration on the Jupiter-6 is really really
amazing! You just hit the button on the CPU board and
follow the steps. The service manual even tells you the
settings for the scope. Good engineering!

Cheers,
Ken

-----Original Message-----
From: Mike Kent [mailto:mikekent@...]
Sent: Sunday, August 13, 2000 10:58 PM
To: Ken Balys; analogue@...; prattwink2@...
Subject: Re: [AH] Jup 6 VCO help

>> Does any one know if the 3340 used in the Jup-6 needs
>> to be a modified chip (white dot mark on it)? My tech
>> seems to think so. He put a normal 3340 in and could
>
> I do not think that it is a modified chip. It should just
> be a 3340. Perhaps someone else on this list can shed light
> on the 3340 (Paul Schrieber perhaps????)

I read about this long ago in Roland service notes for SH-101, but this is
from memory only: The service notes adendum for SH-101 recommend that the
white dot ones are preferred for repairs. Some 3340 are better than others
at holding their tuning calibration. Apparently, Roland marked the better
ones with the white dot.

JP-6 has autotuning so Roland used any CEM in production (with or without
the white dot). The SH-101 does not have the autotuning so Roland installed
the white dot CEM only.

Regards,
Mike.

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