my juppe

Post photos of your Jupiter series analogue synthesizer
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clusterchord
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my juppe

Postby clusterchord » Mon Mar 05, 2007 3:40 am

Image


the plastic cover was missing when i took the pic, but i got one in the meantime. and im missing one plastic slider cap (on xmod). ideas?
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urge
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Postby urge » Tue Mar 06, 2007 3:36 am

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Two for the price of one.Mine and Hfinnie's from the VSE forum.His was an earlier model while mine is a DCB version w/ Encore midi.

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sjones
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Postby sjones » Tue Mar 06, 2007 5:09 am

That is sort of a cool idea to sandwich the old metal side plates in with wood.

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sjones
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Postby sjones » Tue Mar 06, 2007 6:17 am

Urge - You might want to check with 'chipsforbrains' .. he's been having loads of stuff re-made in China for cheap.

nebula
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Re: my juppe

Postby nebula » Wed Mar 07, 2007 4:10 am

clusterchord wrote:im missing one plastic slider cap (on xmod). ideas?


Yeah - periodically search ebay for "roland jupiter" and you'll see them for sale by "technologytransplant". Prices are generally quite reasonable imo.

They are the same caps used on the Juno-60 and (I believe) the Juno-6.

The same seller also frequently offers complete drop-in replacement slider pots (and caps) for Jupter-6.

DIGITAL SCREAMS
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Postby DIGITAL SCREAMS » Sun Apr 01, 2007 11:57 am

Hi Clusterchord & Urge. Nice pictures.

Guys...... your JP8's look like the 12 bit versions. Apparently the early models had a darker casing....whereas the 14 bit models had a more charcole (lighter) colored casing.

Ive got some photos - The first being my original JP8 (12bit) which i bought in 2002. The other four pics are from the JP8 Ive just bought from RL Music...

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DS

nebula
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Postby nebula » Mon Apr 02, 2007 1:39 pm

I don't think there are 12-bit JP-8's with DCB.

ecallender
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A Few More...

Postby ecallender » Fri Apr 20, 2007 4:34 pm

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Synthfool
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Postby Synthfool » Sat Apr 21, 2007 6:40 pm

Rumor control....!!

1. There are many 12 bit units with DCB.
2. Case color will not indicate bit width of the DAC.

Please understand that Roland sent out a lot of 14 bit boards to 12 bit owners over the years. Case color and other changes often occurred without notice or other major changes accompanying them.
Sometimes several changes were made at once and all serial numbers after a certain point will incorporate them and be documented, but that doesn't mean earlier units didn't also have such changes as they became available.
The JP8 was a huge project for Roland and production changes and documentation are not complete.
The rear of a JP8 could have nothing where DCB is, a plate, a dual inline connector or an amphenol connector.
Roland also offered kits to add DCB to older units.

One thing I can say. Avoid extremely early JP8s.
The silkscreened designations for some trimmers are wrong and they have no test points marked or added via terminals.
They even have more trimmers than later ones.
Calibrating one correctly is a major nightmare.
One has to locate their own test points from the schematics, ignore pcb markings, follow alternative calibration instructions and do it all on hinged boards with ribbon cables attached.

Consider this too: I was a tech at Roland US in the 80's when these were big, I've repaired and modded a bunch, owned several, have custom test gear for this exact job and it STILL takes me 6-8 hrs minimum to calibrate the very early JP8's.
6-8 hrs!! (There are over 200 adjustment trimmers in a JP8!)
With what bench time is nowadays, that means a full tuning on an early JP8 can cost $500-800 depending on the tech.
That's just a tuning, not all the other work they often require.

Btw, gorgeous photos above. :)

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dougt
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Postby dougt » Wed Apr 25, 2007 3:37 am

Image

I had them all at one time. The JP-6 is my favorite. I am also one of the original Europa beta-testers...

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clusterchord
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Postby clusterchord » Sun May 13, 2007 1:22 pm

jesus, compared to these immaculate state jupes, mine looks like an old drunk. (but it works, and i got it for cheap.). i do wanna try n make new endcaps or re-fresh the existing ones.


ahh, i would like another jp8 too. i have intentionally left mine slightly uncalibrated in area of filter env times and filt env intesities. so when i arpeggiate it sound almost like a 2- or 3-row analog step sequencer,, (ex. http://www.babic.com/SYN/JP-8/clc_JP8_fx-tweak-arp.mp3 )

so, of course, now i "need" another one to play pads/chords on top of this. and have it fully calibrated. :D (JP8, together w OBX, is the only analog board i could ever imagine having two of..)





@synthfool: hello Kevin. Tom here, nice to see you arround these parts. dunno if u remember me, we had emailed bk n forth a lot about my MKS80 some 2 yrs ago, when u suggested total exchange of the capacitors. (which yielded fantastic results btw).



@digital screams: mine is a 14-bit version, yet without DCB.



fwiw this info is circling arround the net:

“The original Jupiter 8 was released in 1981. Throughout the production of the JP-8 there were a few changes made. Starting at serial #171700 the D/A converter on the Interface board was changed from 12-bit to 14-bit format. This change was made mainly to improve tuning stability. The problem with the 12-bit digital-to-analog converter on the original JP-8 is that it could cause the auto tune to be inaccurate in some instances. Some say to avoid these early JP-8's while others say they haven't experienced tuning problems. Starting at serial #242750 the LED's of the display were changed to brighter ones. Starting at serial #282880 the JP-8 came standard with a DCB port. These newer JP-8's may be referred to as JP-8A's. DCB, or Digital Control Bus, was Roland's pre-MIDI interface that allowed the JP-8 to talk to other DCB enabled hardware, such as the TR-808 Rhythm Composer and MC4 and MC8 micro composers. Previous JP-8's had the option of having the OC-8 retrofit installed to give it DCB capability.”
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Mosk
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mine :)

Postby Mosk » Wed Jun 06, 2007 6:08 am

Mine S/N 212291 14bit & Groovemidi
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Mosk
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i guess

Postby Mosk » Wed Jun 06, 2007 6:14 am

I guess its 14bits im not sure is my model
a newer or what year ???
anyone?
Best
:D

Mosk
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hmm found this

Postby Mosk » Wed Jun 06, 2007 6:24 am

his came in on the AH list. Bookmarking this one for future reference.

According to the service manual there are NINE different versions:

Below 171700: OC-8 (optie) test production
171700 - 181899: D/A converter from 12 to 14 bit
---: OC-8 is optional for 12 en 14 bit models
181900: PROM compatibel with OC-8 PROM's
202100: Modulation circuit
202210: RAM Module Controller Board
242750: Brighter leds installed
272850: Button added to dimm Leds
282880: DCB Board standard

NB: the OC-8 board was the predecessor of the DCB Board

is mine 14bit guess around what year? i have no tuning problem
at all.. it wokrs fine but the modulation button i have to press very hard to get int work maybe need to clean the contact..?
Best regads
Mosk

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juno6
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Postby juno6 » Sun Jul 08, 2007 6:05 pm

Here´s mine...

Image

JZ:


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