All about the Roland Jupiter-series

-----Original Message-----
From: caleb de la Mare [mailto:buzzardszun@...]
Sent: Tuesday, December 07, 1999 11:59 PM
To: analogue@...
Subject: [AH] Jupiter-8 problem!!!


Hello analogue AH's I have a few questions: a problem with my jupiter-8
which I recently aquired. This is what it is doing:

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???

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???

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?

cheers...

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

-----Original Message-----
From: caleb de la Mare [mailto:buzzardszun@...]
Sent: Wednesday, December 08, 1999 11:14 PM
To: Ricardo.Verschut@...
Subject: RE: [AH] Jupiter-8 problem!!!


thanks again, what izz the best way of testing this LFO switch...oh yeah I
noticed that there are two switches underneath that white cap...are they
both switches??? yep I tested it again.....the 4th voice OSC 2 cuts out
after 10 minutes of operation, although it can still be heard, very faint.
The res and cut-off filter work on the 4th voice 2nd OSC...its just very
faint.....would that be an amp perhaps,,,,as the filter stil works...its
just faint?

oh yeah...guess what....I dont do gigs...too many compromises

>From: "Verschut, Ricardo" <Ricardo.Verschut@...>
>To: caleb de la Mare <buzzardszun@...>
>Subject: RE: [AH] Jupiter-8 problem!!!
>Date: Tue, 7 Dec 1999 09:49:33 -0600
>
>~ 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
>
>The LFO-button (the white one) has the reputation of being a bit sloppy
>with
>reacting to the presuure you put on the cap... In other words, these things
>break easely. I'm currently installing my fourth (!) LFO button... You
>might
>want to replace the button and the electronics underneath with a new block
>(if you can get one).
>
>~ 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.
>
>You really should test this to be on the safe side. You don't want the JP
>to
>drop out on you on a gig...? Do you?
>
>Cheers,
>RVe
>