All about the Roland Jupiter-series

Hi Nick

I wouldn't have thought that would be the cause as it was working fine 
and then wasn't. It was on an A frame the whole time and hadn't been moved.
That said... never trust a client who says they've not done anything to 
cause it. ;-)
I'll give the boards another once over when I've got it back up on the 
bench.

Thanks for the input

Much appreciated


Bob

thanks for the tip.
On 17/05/2013 15:49, Nick Zampiello wrote:
> 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@yahoogroups.com
> *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@...> 
>> <mailto:bob@...>
>> *To:* Roland_Jupiters@yahoogroups.com 
>> <mailto: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.
>>
>>
>>
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