I like to play the keyboard and bought a used Korg T1 about a year ago. Recently the battery went out and it lost all of it's programing. Ofcourse I did not have the original factory disk so I went on E-Bay and paied something like 12 bucks for the disk (which I'm sure cost the guy about 75 cents to copy). I also looked online to find instructions on how to change the battery and never really found anything that great so I thought I would document the steps here in case some one is lucky enough to stumble onto it here.
1.) First thing you need to do is buy a new battery. Hopefully you're lucky enough to see this post before you pay 10,20,or $300 (yes people were trying to sell them for $300) for a CR2032 battery that you can buy at your local Walmart or Radio Shack. Believe me there is nothing special about this battery, it is a common battery that you can pick up for a couple bucks.
2.) Once you have the battery, get yourself a decent medium sized screwdriver and remove three screws from the bottom of the T1. On my T1 these were the only three screws with washers. There is one on each end and one in the middle.
3.) The T1 is largely made out of wood with the buttons and LCD display on a black medal panel. Once you have the screws out, this medal panel will lift up from the front. It is hinged from the back. Once you lift this up you will see something like the top left picture.
4.) The batter is under the middle circuit board. You need to be able to remove this circuit board. There are 3 screws in the back near the PCM Card slot and one in between the O and R in KORG. Removing these 4 screws and three addional screws on the circuit board will free it from the chassis.
5.) While the board is now free there are still at least half a dozen ribbon cables restricting it's movement. You will need to remove some of these to be able to flip the circuit board to get to the battery. I recommend removing the two from the front and two from the left of the board.
6.) Once you are able to flip the board you will see the battery which I have circled in red in the top right picture. Simple remove the battery from the battery holder and replace it with the new one.
Viola you are done. You just need to put your keyboard back like you found it and reload you factory settings.
