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Sequential circuits samplers

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Message

Re: Prophet 2002 shorting issues.

2007-10-16 by duncan

>>Pictures:
> http://cs.1729.googlepages.com/pcb_topdamage2.jpg
> 
> http://cs.1729.googlepages.com/pcb_btmdamage.jpg<<

the first picture is, I think, where one of the front-panel components
attaches to the board; is it the data pot or the balance control
maybe? the second pic is just ground wiring, & both look more alarming
than they actually are. there should be a connector in that first picture.

I have schemos somewhere, & a functional 2002 I can take pics of, + a
dead 2000 which needs a new keyboard controller IC (WC haven't got any).

I will try to find time this week to "pop the trunk", as they say.

your shorting problem is more likely related to the power supply- does
the thing function at all? can you (or a tech, if you aren't one)
check the power supply basics? it's 12s & 5s, as you'd expect, &
pretty generic.. you should be able to isolate the power supply from
the rest of the machine & see if it works off-load, then start looking
for dead capacitors, op-amps, maybe the floppy-drive...

duncan (london, UK)

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