Megadrive 2 50/60Hz and Jpn/Eng Switches
I'm really not very happy with this guide, if I see a cheap MD2 for sale and I've got the spare cash then I will buy it and update this guide - Pete
A Megadrive 2 is a little bit more difficult to add 50/60Hz and Jap/Eng switches than a Megadrive 1. It involves finer work, lifting a leg from a chip, as well as cutting a smaller trace on the motherboard. Make sure you read the Megadrive 1 guide as it explains some of this in more detail.
Take your console apart (very straight forward), and remove the metal shielding. During this guide mmmonkey left fitting the switches until the last minute - this is not recommended, it is much easier to fit them before you begin soldering (as in the Megadrive 1 guide)
Jpn/Eng Switch
We'll do the more difficult Jpn/Eng switch first, look for the following chip on the motherboard, and you'll need to lift leg 107 from the motherboard (very easy to find leg 107, as 105 is the corner leg, labelled for you). If you've got a very fine craft knife, or a needle you may be able to lift it without even needing to use a soldering iron. Gently use the knife blade to prise the leg off of the motherboard.
Look at leg 107, you can follow the track along the motherboard a short distance, if you've got a fibreglass pencil, the use it to prepare this point (otherwise scrape at it very carefully with you craft knife), you will need to solder a wire to this point in a minute. Now it's a good idea to isolate leg 107 so it can't make contact with the motherboard by accident. Lay some electrical insulation tape over the motherboard directly underneath the lifted leg. Maybe put 2 layers of tape. Solder a wire to this leg, wait for the solder to cool completely, then cover with more insulation tape, this is just a precaution, to protect the leg if the wire gets pulled. (Remember to "tin" the wire and the leg before attempting to solder them)
Melt some solder onto the point that you previously prepared, then solder a wire to this point (remember to "tin" the wire)
The remaining wire for this switch needs soldering to a ground/earthing point. There are lots of possible points you can solder onto for this. mmmonkey finds it easier to use the following point, as it doesn't interfere with the shielding too much when you re-assemble the console. Solder 2 wires in this area, as the 50/60Hz switch will need one as well.
All that remains is to solder the wires to a switch, tin the contacts of the switch and solder the wire from leg 107 (red in this guide) to the middle contact of the switch. The wire from the point that was linked to leg 107 (grey and red wire in this guide), should be soldered to either of the 2 remaining contacts, and the wire soldered to ground (yellow in this guide), should be soldered to the remaining contact of the switch.
