All about the Roland Jupiter-series

Hi Mike

I myself am an audio tech with 17 years experience of repairing music 
gear, working for many high profile artists and studios in the UK.

I am merely asking if anyone has had similar symptoms, and if so did 
they get to the bottom of it.
I am not asking if anyone can fix it.
I find as a tech that pooling information speeds up the fault finding 
process considerably. Surely part of the purpose of this forum is to 
share information?

The synth (According to my client) was working one day, and then when 
turned on on another day... not working. I have changed the battery as 
it's a common cause of problems in many synths, and have tried to reload 
the factory banks in an attempt to clean out any corrupt info in the 
memory that may be causing this behaviour. That is all.

B





On 17/05/2013 14:15, Mike Borish wrote:
> Bob,
>
> I don't mean to offend you but your  assessment of the problem and 
> troubleshooting sequence is completely worthless if you want somebody 
> to help you fix it.  I really don't like saying this but please leave 
> it alone if you don't know what you are doing.  There are several 
> pitfalls in the Jupiter-6/MKS-80 that even experienced techs fall 
> into; most notably trace damage when replacing IC's.
>
>  I work out of several shops in the Chicagoland area and would be 
> happy to fix it for you.   I've been working on the Classic Roland 
> synth line and others for about a decade.
>
> -Mike
> 312-363-7286
>
> ------------------------------------------------------------------------
> *From:* blzproductions <bob@...>
> *To:* Roland_Jupiters@yahoogroups.com
> *Sent:* Friday, May 17, 2013 6:01 AM
> *Subject:* [Roland_Jupiters] JP6 Crashing
>
> Hi
>
> Just putting the feelers out to see if anyone else had had this 
> experience, and knows anything about what might be causing it.
>
> I'm servicing a JP6 for a client that has come to me with the 
> following fault.
>
> When switched on it looks OK, but no sound. Then after you've moved a 
> few sliders or pressed a few buttons, all the LEDs go out apart from 
> the write protect switch and the LFO2 indicator (LFO2 LED not being 
> controlled by the CPU)
> Initially I thought it was probably the battery. I checked the 
> battery, and it seemed to be OK, but I changed it anyway.
> Then I've tried to reload the Factory Banks.
>
> When I press Tape Memory and LOAD all looks OK, but when I release 
> LOAD... all the LEDs go out again (this could be normal... it's been a 
> while since I serviced a JP6)
> When the second pilot tone kicks in, the JP6 lit up again, but still 
> no sound, and after a few button presses it crashes again.
> On subsequent attempts to load the factory settings, once I release 
> LOAD the lights go out, and the JP6 stays inert from that point on.
>
> My thoughts at the moment are CPU/Eprom related.
>
> Anyone had these symptoms? And if so... did anyone get to the bottom 
> of it?
>
> Any input most welcome
>
> Bob
>
> P.S. JP6 is running P8031 processors with eproms, rather than the 
> older processors.
>
>
>
>