I just reset mine....
The board is in the back of the CRT behind and between the CRT guns. It is under the flip up main board between the red and green CRTs. There should be a dust cover covering the board. It is metal with a plastic hood near the front of it. Remove the dust cover by pulling up and then toward you. You will see 3 boards, upright in verticle slots. The Y board is farthest to the left, nearest to the Red CRT gun. You can remove it by flipping the tabs on either end of the board. This will pop the board out of the slot. Toward the top of the board, you will see the DIP switches and the reset button. Remember that you have to flip the DIPs and hit the reset button while the board is in the projector. Getting the board out will let you see where the switches and button are. Sometimes the DIP switch sticks a little, so flipping it off is easy, but flipping it back on takes a little force. I have a pretty big finger, but I was still able to paw it into position for the reset!
Hope this helps!
-Alex-