+slx Posted December 29, 2017 Share Posted December 29, 2017 After a major restoration/retrofit session (NOS keyboard, new upper case, Super Colour CPU card and 48/52K RAM Card as well as swap of the system crystal to PAL) my 400 seems to work fine with the exception of the [sYSTEM RESET] key. I have to admit that I did not test the keyboard that thoroughly so I'm not sure if that key ever worked. I noticed some "black spots" in two of the conduits on the mylar keyboard connector and would appreciate feedback on whether that could be the culprit and if/how it can be tested and/or repaired. I set up the new RAM card to run Newell OS N - so different System Reset behavior would be another possible explanation. As it is supposed to switch to Omnimon using Option+System Reset that doesn't look like a plausible explanation, though. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted December 29, 2017 Share Posted December 29, 2017 test conductivity along that trace with a multimeter? If its bad, that looks like a good candidate for repair with silver conductive paint/pen. Quote Link to comment Share on other sites More sharing options...
+slx Posted December 29, 2017 Author Share Posted December 29, 2017 test conductivity along that trace with a multimeter? If its bad, that looks like a good candidate for repair with silver conductive paint/pen. Isn't it embedded between two layers of mylar? Can I pry those apart without ripping everything apart? Quote Link to comment Share on other sites More sharing options...
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