All about the Roland Jupiter-series

Thanks Ricardo, for that speedy response.....everything else works fine in 
the bend box,,,all the VCO and VCF bender works fine! and I agree with you 
that their does not seem to be any familiar pattern in voice assignment, a 
little weird....the only thing that does not work is that LFO white button, 
and the knob for the lfo rise time, the portamento works fine, what i think 
i just realized is that the jp only skips this note on the 4th voice only in

the test mode. when powering up in normal mode as ya said, i think it works 
fine. thanks.


>From: "Verschut, Ricardo" <Ricardo.Verschut@...>
>To: caleb de la Mare <buzzardszun@...>, analogue@...
>Subject: RE: [AH] Jupiter-8 problem!!!
>Date: Tue, 7 Dec 1999 09:21:06 -0600
>
>~ 1)the bender box: VCF and VCO mod(the white button for mod
>~ lfo) does not
>~ work when the VCO and VCF is assigned.???yes I have turned up
>~ the faders all
>~ the way as well! what could be wrong???
>
>Does the 'portamento' and 'bend' functions work? This could be many things,
>but most likely it will be a loose contact... There's only one way to find
>out...open the box and check all possible connections. If the whole panel
>doesn't work, this might be easier to fix than just one or two
>non-functioning buttons/sliders.
>
>~ 2)the other problem is while playing in WHOLE MODE: the 2nd
>~ OSC of the 4th
>~ voice has no sound(poly-2 i think). When i first got the
>~ machine, I played
>~ down the keyboard starting at the top and every 8th note did
>~ not work, now
>~ instead I can play the same note over and over again and its
>~ always the 4th
>~ voice OSC 2 that does not work.does this sound like a a OSC
>~ chip.....but it
>~ does not happen all the time???
>
>The voicing-cycle in the JP8 (at least on mine) doesn't make any sense
>whatsoever. I have not been able to find a pattern in the way the processor
>devides the voices. This results in (when having a faulty osc) 'random'
>drop-outs.
>
>I've seen this problem before and it cannot be anything else than a faulty
>osc. Again you need to open the box in order to find out which one doesn't
>work. So, dig up your screwdrivers, soldering iron and scope. Tip: You may
>find the circuit diagram of great help...
>
>The JP8 holds four boards with two oscs each. Once you've found out which
>osc is faulty, next thing is to find out which element doesn't put through
>the signal and determine if this requires either a custom or a 'regular'
>part. You might be in trouble if it's a custom part... Roland doesn't have
>loads of ICs on stock from the older machines...but you could try it with
>them.
>
>~ 3)when holding down the numbered buttons to the right of the
>~ display 1 and 3
>~ while powering on the jupiter-8, the display shows the
>~ version of keyboard
>~ scanning, after that every time I play a note the buttons
>~ light up(led's) is
>~ this meant to happen on normal power up operation?(without
>~ holding down
>~ buttons 1 and 3?
>
>No, when holding down the buttons during power-up, you put the machine in
>test-mode. The lit LEDs show the osc that is sounding. 'Reboot' without
>pressing any buttons should put your machine back in 'normal' mode.
>
>Cheers,
>RVe