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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@...>
Sent: Friday, May 17, 2013 10:44 AM
Subject: Re: [Roland_Jupiters] JP6 Crashing
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.
On 17/05/2013 14:15, Mike Borish wrote:
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.
From: blzproductions <bob@...>
Sent: Friday, May 17, 2013 6:01 AM
Subject: [Roland_Jupiters] JP6 Crashing
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
P.S. JP6 is running P8031 processors with eproms, rather than the older processors.