Macross_VF1 Posted April 4, 2019 Share Posted April 4, 2019 (edited) So I'm currently doing some maintenance and cleaning of my Intellivision console and while doing some research on the machines schematic I came across the chart below and figured I might as well give it a try. And I'm pretty happy that I did for I got some readings that I hope you guys might be able to help me with. So, using the above chart I mapped out the suggested test points. TP-1,2,3 and 5 are all good but TP-4 gives +25.6V and TP-6 outputs +13.8V. Since TP-4 is directly connected to C3 I figured I might as well replace it as I have a decent number of 2200uF/50V capacitors lying around, however the TP-4 and 6 voltage levels remain the same. Unfortunately I don't have any to replace C1 with (10000uF/16V). Normally, voltage that high above their suggested levels are not good for a console though I wonder, could this be due to me having a Pal console, a different revision or any other possible reason? Also, I suppose I should add that I tested it while unconnected to the console. Edited April 4, 2019 by Macross_VF1 Quote Link to comment Share on other sites More sharing options...
mr_me Posted April 4, 2019 Share Posted April 4, 2019 (edited) They're non-regulated so the voltage can vary. It probably reads higher when there's little load. Edited April 4, 2019 by mr_me 1 Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted April 4, 2019 Share Posted April 4, 2019 Exactly, I would test these points again with it connected to the main board and with a game running. 1 Quote Link to comment Share on other sites More sharing options...
Macross_VF1 Posted April 4, 2019 Author Share Posted April 4, 2019 Exactly, I would test these points again with it connected to the main board and with a game running. Tested again while connected to the main board and a game running. TP-4 is still a bit high, though perhaps not overly so at 19V, and TP-6 outputs a far more reasonable 5.85V. So probably just a false alarm then. Oh well, better to be safe than sorry with electronics that are this old. Quote Link to comment Share on other sites More sharing options...
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