Vintage Synth Repair

A quick google of spec sheet reveals that it is
basically a cmos 2114 so you'd be looking at a 5114 or
a 5514 and variations of that. See this is where the
fluke 9010a comes in handy..It can check and resolve
this kind of problem in minuites :)

Thanks, Phil.


--- Frank Simon <fsimon001@...> wrote:

> I did find a chip pulling down DB4 on U311 it is a
> 6514 4K CMOS RAM. Thank god for IC sockets. The only
> problem I'm a little confused on a cross for it. It
> appears obsolete. It is called D444C on the chip and
> 6514 on schematic. Can anyone offer advice on a
> cross.
>   ----- Original Message ----- 
>   From: fsimon100 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Friday, May 30, 2008 8:58 AM
>   Subject: [vintagesynthrepair] Prophet 10 dead
> 
> 
>   Was curiouse if anyone can offer help. I bought a
> dead P10 no lights 
>   or anything. The processor is good. I put logic
> analyzer on decoder 
>   output and see ROM1 (Y0) and RAM (Y5)(which I
> believe is the scratch 
>   pad memory)active at start up. All address buses
> and Data buses are 
>   active. I am not certain the algorithm. A flow
> chart would be nice or 
>   some help with what I should see at some critical
> points. I am 
>   wondering if there is a chance the ROMs lost
> programming and how would 
>   I know. Even if they did shouldn't lights and/or
> display come on. And 
>   yes the power supplies are good.
> 
> 
> 
>    



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