[Arakon]

the neo 2.2 sends the scex signal at 5 V, which is above the specs of the components.. a resistor of 220-270 ohm reduces it to a decent level, and will prevent damage to the laser.
if you have problems booting stuff, you might need to go lower in ohm value, tho.. just try out some values to see what works best, I had to use 100 ohm in my ps2.
it's simply soldered between the capacitor and the mainboard point for pin 2.