Glen's Retro Show Posted May 30, 2016 Share Posted May 30, 2016 This is my TI-99/4 power unit that came in my 1980 TI-99/4A. Orange wire should be +5v..but i get -6.71 vdc, black wire should be +12v..but get -11.99. And green wire should be -5v and i get -17v. So i would think it fried my motherboard. What could have went on this to cause such voltages? And yes i have right wires on my fluke going to white wire common. I think the fault is this brown cap but dont know what it is..any ideas? If i can get motherboard working..i have an idea for a replacment wall wart and power board replacnent with a very available and common wall wart. (details on this to follow). Quote Link to comment Share on other sites More sharing options...
mister35mm Posted May 30, 2016 Share Posted May 30, 2016 www.digitpress.com/library/techdocs/99-4a_technical_data.pdf http://www.mainbyte.com/ti99/hardware/power_supply.html http://www.mainbyte.com/ti99/man/ti99_tech.pdf 1 Quote Link to comment Share on other sites More sharing options...
Glen's Retro Show Posted May 30, 2016 Author Share Posted May 30, 2016 Thank you, had the first link, not the 2nd..now if i can understand it lol..but will give a gooooo Quote Link to comment Share on other sites More sharing options...
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