RickR Posted January 19, 2020 Share Posted January 19, 2020 Hello: I'm looking for some help on replacing the actual power on/off switch on the motherboard of a 5200. Does anyone know of a replacement part of any kind? I have a 5200 that the physical switch has been smashed up and is unusable. I can solder, but I don't know how exactly this thing works, as it appears to have three prongs. Thanks. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 22, 2020 Share Posted January 22, 2020 @RickR - Did you ever hear from anyone on this? I'm pretty sure the power switch from my parts board is in good shape and I could remove it and send it your way? 1 Quote Link to comment Share on other sites More sharing options...
RickR Posted January 22, 2020 Author Share Posted January 22, 2020 I did hear from greenween, who is sending me the board from his crushed 5200. I'll harvest the switch from that one. Thanks, though! I'm still interested to know how the 5200 switch works. It seems to work by providing a quick on/off electrical connection when you press the button and then somehow the console stays on (or off). As with many things about the 5200, Atari seemed to overdesign it. They could have just used a standard on/off switch. My guess is that this circuit they came up with had some purpose. Like maybe it would auto shut-off if you pulled the cartridge or something. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 22, 2020 Share Posted January 22, 2020 No it works the same as it does on the 7800. It is momentary in that when you press the button and complete the circuit, you activate the flip flop IC near it and that IC is what switches the console on and off. The 7800 has the same flip flop IC in it. And I'm pretty sure that a 5200 will still power on whether a cartridge is plugged in or not. At least I'm pretty sure my 4 port unit will power on regardless. Quote Link to comment Share on other sites More sharing options...
RickR Posted January 23, 2020 Author Share Posted January 23, 2020 But...the 7800 is a normal push button with two prongs. 5200 has three, which is where I get lost. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 23, 2020 Share Posted January 23, 2020 Likely one of those is just an extra ground for stability or something. The original filter cap has three leads on it also. Quote Link to comment Share on other sites More sharing options...
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