ok, here's the deal people. i spent a couple of hours tonight trying to figure out the easy way to do this. to convert your USA version 1200 to 220V with all the correct parts would be a major PITA and probably not be worth the parts cost. so the easy way to do this is to get a UK transformer and set it up so it runs 220V all the time. technics has changed the transformer and voltage switch between the MK2 (& M3D) and the MK5 (& 5G). so here is what you need.
for the MK2/M3D get SLT66DTE13E transformer.
for the MK5/5G get the SFDZ122S01E transformer (N/A in the US).
the MK2/M3D dual transformer should work just fine for the MK5/5G as they both run at 30V AC on the main board, but the MK2/M3D wiring instructions must be followed.
i would highly recommend connecting an inline fuse between one of the yellow wires and the main circuit board if your deck does not have one inline. MK2s and early M3Ds do not. this should cost you $40 or less to do this work. i don't have access to an MK5 or 220V, so if you are serious about doing this, contact me and i will double check my wiring. please realize that I AM NOT RESPONSIBLE FOR ANY DAMAGE TO YOUR DECKS FROM THIS MOD. if/when you move back to a 120V neighborhood, you can either run your standard transformer or just connect different wires to run at 120V. i gleaned all this information from the MK2, M3D, MK5 and MK5G manuals, so i'm not just pulling this out of my ... please let me know if anyone has any questions. - jeff h
EDIT: i'm going to have to do more research and testing on my 1210 to verify this stuff. it can be done, but i want to be 100% before i am posting what connects to what - this is why i removed the info i posted earlier. if you are in a hurry to do this, please contact me. ZINN, i'm getting a parts list together for the parts you are requiring. - jeff h