I am running into a strange problem with my 25C. If the machine is cold, the registers and the program memory will not store or recall data properly.
I found out that by warming up the machine, such as by plugging it into the charger. Then everything will work perfectly, including the Continuous Memory, which indicates that the RAM chips are probably OK. It continues to work even after I disconnected it from the charger, but as the machine cools, the problem returns.
I read the article on "A Common Woodstock Problem and Repair Suggestion." Does the fix for the 25 apply to the 25C? I am hesitant to try it as it says "The 25C and 29C use some CMOS technology and some NMOS, however they seem to have an entirely different set of problems. The following solutions have been found to fix this problem on the 22/25/27 so that the calculator works as it should initially"
Any guidance would be greatly appreciated.