Archive of the former Yahoo!Groups mailing list: All about the Roland Jupiter-series

From: Verschut, Ricardo
To: 'DrTempus'

Hi Doc,

I've got a pre-DCB JP8 myself! And man, am I proud to be the owner. It is by
far the most used instrument in my studio, and that while I do a lot of
things by sequencing through MIDI...
;-)

~ Question though, in testing that my repair was successful, I found
~ another voice with a VCO
~ not sounding. This is happening when the self-test LED D8 is lit.
~ Could you tell me which
~ module board and vco this equates to?

That should be board D, which holds VCO 7 and 8. D8 might tell you it is the
eight voice. You can also test this by playing the keyboard up and down for
eight notes. With the right sequence, the same osc. should always sound with
the same key...

Only problem is, it might be the processor as well. It doesn't always have
to be the VCO board. If it appears to be the VCO board after all, be
prepared to order custom ICs from Roland! I had a terrible time trying to
get my hands on the VCA's, but in the end I managed. My JP8 is now 100%
functional again.

~ I traded a TR-909 for this instrument over the weekend.

Good deal, I'd say.

~ I have seen alot of crazyness when accessing presets and
~ patch presets,
~ such as it going into
~ retune, the patch display flashing dashs (amoung other things), all
~ patch number and patch
~ preset LEDS coming on, etc.
~
~ Fixing the blown module I visually found has reduced the occurance of
~ this, but it looks like
~ I have 1 more bad vco to find, and hopefully, I won't have any other
~ problems. :-(

I don't know this problem, but it doesn't sound good...

Keep in touch and let me know if there's anything more I could help you
with.

Cheers,
RVe