If you didn't clip the long wires off that terminate into the motherboard then maybe they are touching underneath.
Look at the bottom of schematic 880-106 for S2. The two switch has two Pull-up resistors, R13 and R14. The switch also goes through an inverter, 04, and then through a buffer, marked as "X" (does not invert).
You should see pin 3/4 on IC'W and pin 10/9 on IC'X when trying to protect
Pin 1/2 of IC'W and 4/5 on IC'X when trying to unprotect
.
What do you see? Take out the memory card when doing this test.
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