Hi Paul, Thanks for the suggestions. Last night I partially lifted each of the ram and CPU related ICs, I’ll keep an eye on it over the next few days to determine if this indeed worked. It was looking promising since I had it on for several hours with no
memory loss.. fingers crossed.
I do have a scope and will look at the 5v rail when I have a chance, and I also ordered some new eproms just in case.. the set was a reasonable price from a guy locally.
By the way, the new membrane I just installed is working fantastically! Many thanks for that.
Regards
Greg C.
On Mar 23, 2017, at 2:22 PM, 'Paul D. DeRocco'
pderocco@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:
You might try partially unseating and then reseating various chips, to make sure the connections in the sockets are clean. Just pry them up a little and push them back down. Can't hurt to do this to all the chips in the CPU section.
It's also possible that the EPROMs are fading. If you have access to an EPROM eraser and programmer, you can reprogram them, using the files on the RhodesChroma.com site.
It would also be nice to know if there's any significant ripple on the supplies, especially the digital +5V. Do you have access to a scope? Sometimes they look good on a meter, but are noisy.
--
Ciao, Paul D. DeRocco
Paul mailto:pderocco@...