Turn over the the battery cover and with a pair of needle nose plyers, bend the two outer spring fingers inward a bit. It will look like a white or green powder. At this point, look at the pads to be sure there is no corrosion on them. You will probably see a black dot but if you look under a magnifying glass, you will see the bare circuit board. When you get the cover removed, look at the pads. There is one at the top center and one on each size approximately centered along the length of the battery. ![]() Work along the edge and unsnap the 3 snap joints. Get a small flat blade screwdriver and pry along the edge of the upper and lower covers (not the loose cover). Then remove the screw covering the flat backup battery - just above the batteries. ![]() To reach the contact pads, you simply remove the 6 screws along the outer part of the cover. In my calculator, the spring wore thru the contact pad. The board flexes slightly when buttons are pushed and this causes there to be wear between the spring and board contact pad. If the above doesn't work, then you need to look at the contact springs from the batteries to the main board.
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