OK...
I've been poking around some more (now that I've got a Juno 60 out of the way, and a set of fairchilds off the bench), and have established that the fault is indeed on the processor board.
I've noticed that even playing the keyboard causes the Jupiter to crash.
So... I've been looking at the schematics and looking at the common factors.
I've already ordered a replacement processor, and EPROM, but am thinking the issues could also be down to a peripheral chip failing.
Most of the logic chips are Toshiba 40H series. Does anyone know if these are 100% compatible with 74 series CMOS logic? i.e. The only current equivalent for the TC40H373P, is the 74HC373. I know they're pin and function compatible, but are there any pitfalls I need to be aware of?
Any info most appreciated
B
--- In
Roland_Jupiters@yahoogroups.com, Bob Stewart <bob@...> wrote:
>
> I once had an engineer explain that he had no idea why the desk was
> generating a full scale feedback signal... Only to come back to me
> sheepishly after an hour or so and say "well, I did spill half a pint of
> Guinness over a small group of channels, but they seemed ok at the time, so
> I'm sure it wasn't that.
> I then explained how conductive Guinness gets when it dries out!
>
> On Friday, May 17, 2013, Nick Zampiello wrote:
>
> > ∗∗
> >
> >
> > ha, everyone always says the same thing. ' i don't know what happened it
> > just stopped working! '
> >
> > forgot to mention:
> >
> > dropped down stairs
> > stepped on by a Yetti
> > blown up by an IED
> > fell in a pool full of Bacardi
> > freak skiing accident
> >
> > LOL
> >
> >
> > NEW ALLIANCE EAST!!!!
> >
> > --------------------------------------
> >
> > ∗New Alliance East∗ - Mastering <
http://newallianceeast.com/>
> >
> > New Alliance East - Facebook <
https://www.facebook.com/newallian%20ceeast>
> > X :::: B :::: S<
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&sqi=2&ved=0CC0QFjAC&url=http%3A%2F%2Fxbs111.wordpress.com%2F&ei=rNMqT4LLMcmEsAKtk7WwDg&usg=AFQjCNHYjcyJYRf58A81_tpPpaKYjc2PAw&sig2=1gIhPv8oUH76FChuLviaGg>
> >
> >
> >
> > ------------------------------
> > ∗From:∗ Robert Stewart <bob@... <javascript:_e({},
> > 'cvml', 'bob@...');>>
> > ∗To:∗
Roland_Jupiters@yahoogroups.com <javascript:_e({}, 'cvml',
> >
'Roland_Jupiters@yahoogroups.com');>
> > ∗Sent:∗ Friday, May 17, 2013 10:57 AM
> > ∗Subject:∗ Re: [Roland_Jupiters] JP6 Crashing
> >
> >
> > 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?
> >
> >
> >
> >
> >