Vintage Synth Repair

Thanks for the tips Duncan.  I'm experienced enough to check the 
voltages, and come away with 3 brands, 4.37, 11.87 and 26.  Does that 
sound ok?  Is the 26 for professional operation?  

Anyway, voltages seem ok, fuses ok, no leaks from any components...

I'm beginning to think it's beyond me.  No chips in sockets (like my 
kurz 1000px -- that was the problem there)

If it worked, then I'd chase after the battery, but it doesn't seem 
to work very well at this point.

What do you think...beyond me?

Thanks,

Fred



--- In vintagesynthrepair@yahoogroups.com, "ferrograph632" 
<ferrograph@...> wrote:
>
> >>I have a Roland SDE 1000 Digital Delay that I used 20 years ago 
in my 
> > studio -- now it doesn't work.  Digital Delay flashes as delay 
knob 
> > is turned, but the output is pretty garbled, and the number panel 
> > doesn't show any info (except when turned from on to off)<<
> 
> more likely to be a power supply problem- can you check (or get
> someone to check) the power supply rails inside the thing? there
> should be 12s & 5s in some combination, same as in 99% of digital 
kit.
> +12, -12, +5, -5, & maybe some more of the same for analogue 
circuits... 
> 
> look at the big capacitors around the power supply- prob'ly one of
> them has leaked a bit or otherwise failed. or it could be a 
rectifier
> bridge that's failed. 
> are any of the chips socketed? you could try "crunching" them home
> gently...
> if it's not this, you may discover some combination of key-presses
> that re-initialises the box, if it is a dead memory battery. this 
too
> should be checked for terminal voltage (with the box off) & leakage-
> many of these batteries can damage circuit boards if they are badly
> sited & have leaked. poly-6 owners know all about this!
> 
> hth-
> duncan.
>