MrDave Posted November 23, 2022 Share Posted November 23, 2022 I would say its not a good ram to use I am not a expert on the coco1.. but some of those old ram chips used 3 voltages 12v -5v +5 v Quote Link to comment Share on other sites More sharing options...
RetroB1977 Posted November 24, 2022 Author Share Posted November 24, 2022 On 11/23/2022 at 1:00 PM, MrDave said: I would say its not a good ram to use I am not a expert on the coco1.. but some of those old ram chips used 3 voltages 12v -5v +5 v This one was modded to support 4164 chips that used +5. I did some reading and as long as pin 1 is connected to ground it will be fine. Quote Link to comment Share on other sites More sharing options...
MrDave Posted November 25, 2022 Share Posted November 25, 2022 Out of curosity measured from ground on the rf can.. what voltages do you have on each corner of the ram chip socket ? Quote Link to comment Share on other sites More sharing options...
MrDave Posted November 25, 2022 Share Posted November 25, 2022 Oh, and let us know when you change that cap.. cause voltages being unstable cause crashes Quote Link to comment Share on other sites More sharing options...
RetroB1977 Posted November 25, 2022 Author Share Posted November 25, 2022 10 hours ago, MrDave said: Oh, and let us know when you change that cap.. cause voltages being unstable cause crashes It's coming in the post today so I'll change it today or tommorrow. Quote Link to comment Share on other sites More sharing options...
RetroB1977 Posted November 26, 2022 Author Share Posted November 26, 2022 I replaced it and it still crashes. The 10,000uf capacitor is not in very good shape, could it also be a problem? Quote Link to comment Share on other sites More sharing options...
MrDave Posted November 26, 2022 Share Posted November 26, 2022 Can you measure the voltages on the ram socket 4 corners ? And yes the main caps have to be good as it changes ac to d c voltage and uses thoose caps to smooth out the power . Quote Link to comment Share on other sites More sharing options...
RetroB1977 Posted December 3, 2022 Author Share Posted December 3, 2022 On 11/26/2022 at 8:59 AM, MrDave said: Can you measure the voltages on the ram socket 4 corners ? And yes the main caps have to be good as it changes ac to d c voltage and uses thoose caps to smooth out the power . All the voltages are in the 5% range the service manual says. Quote Link to comment Share on other sites More sharing options...
RetroB1977 Posted December 3, 2022 Author Share Posted December 3, 2022 I removed the 10,000uf capacitor to inspect it, it is in very bad condition and is leaking. (Note to self, buy an LCR meter.) Quote Link to comment Share on other sites More sharing options...
MrDave Posted December 3, 2022 Share Posted December 3, 2022 Alot of meters can measure capacitance ... but if it's leaking you don't need anything fancy to know it's bad good luck..and the best thing to do is clean and inspect by eye. Good luck 2 Quote Link to comment Share on other sites More sharing options...
MarkO Posted December 5, 2022 Share Posted December 5, 2022 On 7/5/2022 at 11:31 AM, MrDave said: I recently bought a arduino based ram tester.. I had made one once.,but took it apart.. Can you post a link to this Open Source Project?? MarkO Quote Link to comment Share on other sites More sharing options...
MrDave Posted December 5, 2022 Share Posted December 5, 2022 I got it from Bee Rye on our coco discord .( it's where all the cool coco people hang out ) Quote Link to comment Share on other sites More sharing options...
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