[sdiy] Prophet 5 rev2 conundrum

g m montalbano montalbanogm at gmail.com
Thu May 4 00:45:39 CEST 2023

All very true. However, the problem isn't on the CPU board, since that
board works correctly with another Voice board.
The power supply, front panel,CPU board and 60 pin cable are all good --the
fault is on the Voice board.

On Wed, May 3, 2023 at 2:49 PM Jay Schwichtenberg via Synth-diy <
synth-diy at synth-diy.org> wrote:

> For somethings not in the analog realm.
> One of the first things to check in old systems like these after the
> power supplies is the reset circuit.
> If I remember correctly there are multiple EEPROMs in it. Could be the
> tuning code in one of them could of gone bad. EEPROMs don't last forever
> and if the code is bad the processor would wonder off into oblivion.
> Might very carefully pull the EEPROMs and reseat them to see if a socket
> connection might of gone bad too.
> These are they types of problems logic analyzers are good for. Big pain
> to setup but the problem maybe a lot easier to find.
> Jay S.
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