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Hi, welcome and thank you for your question. My name is ***** ***** I am glad to assist you today.I am very sorry about your issues. I believe voltage rating there is 110 as compared to the 220 that you could be using. However, most adapters for laptops and other electronic devices are rated or designed to work for 100V to 240V. This means that you can directly plug it there in Japan without any need of special voltage adjuster.
So please verify it there with your Surface adapter. In the adapter assembly, you can find a rectangular box where power cable is connected. Please see the voltage rating. If you see 100V to 240V there in the labels, it means you are safe to plug it to the wall socket of 110V.
Here is a sample Surface power adapter. Zoom in the picture and you will see there the INPUT as 100-240V. If you see that same voltage or input rating in your power adapter there, then you can plug it there in Japan without need of voltage regulator.
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I am very sorry if the answer I gave you did not help you. Please clarify: are you using Microsoft Surface Pro? I am asking because that device does not connect directly to the wall socket, it has a power supply that converts wall electricity (AC) to DC.
Surface 2 has a non-removable battery and that means that it is not plugged in directly to be powered by AC but DC through the battery. And the adapter that converts AC to DC is the rectangular box I described and this adapter can take 100 - 240V. If there is no adapter of your power cable, that is, if you connect the cable directly to the Surface 2 and then to the wall outlet, I believe the AC converter assembly is built in as well.
Can you please take a picture of your power cable and HOW it is connected to the Surface 2?
Thank you for writing back with that important picture. Indeed, you are using a power adapter/charger. The only difference with the one I originally described is that, your rectangular box (where the AC to DC conversion takes places) is where the plug is! That rectangular object you used to plug into the wall socket is the charger/adapter and I am 100% sure that it has a rated INPUT of 100 to 240V because that is a standard manufacturer's assembly. That is, it will surely work when you are in Japan where wall sockets are 110V.