All about the Roland Jupiter-series

have you checked the ad / input slider circuits?

maybe there's a short in a slider that is hanging the machine.

will these boot without the input boards attached?




 
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________________________________
 From: Robert Stewart <bob@...>
To: Roland_Jupiters@...m 
Sent: Friday, May 17, 2013 10:44 AM
Subject: Re: [Roland_Jupiters] JP6 Crashing
 


  
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.
>
>
>
>