Modding a US Genesis Model 1

[coreycorey2000]

I was wondering if someone could answer a quick question for me. I've tried searching online but every explanation I find is about a PAL Megadrive and I don't think a US Genesis is exactly the same.

 

I'm installing a 50/60hz switch and a Jap/US switch in a model 1 Genesis. I have the Jap/US Switch working properly but the 50/60hz switch won't work. When I flick the switch the system turns off. I've read that you have to cut traces but I don't know where. I've tried cutting them between JP2 and JP3 but that didn't seem to work. I think I read that for US systems you have to cut JP4....

 

Where do you cut the traces for a US Model 1 genesis?

 

Is it necessary to connect any 2 points? I'm not using the left JP1 or JP4 at all.

 

Thanks!

[Zerosquare]

If your 50/60 Hz switch has one side connected to +5 V and the other one to ground, check that it's break-before-make type, not make-before-break. Otherwise, you're short-circuiting the power supply for a moment each time you toggle the switch.

Edited December 12, 2006 by Zerosquare

[Bruce Tomlin]

Even better is if you could use an SPST switch with a TTL chip like a 7404 inverter, then connect the output to the common pin of the jumpers. Connect a 4.7K resistor to +5 on the input of the 7404 gate, and a switch to ground.