I fixed my Fluke 87 RMS buzzer by replacing the small "pegs" that make contact between the circuit board and the plastic plate with the piezo disk with small snips of wire (used old thermostat wire). I don't think either original peg was making contact. I did do the test on the circuit board to ensure I had the 3KHz Square wave 3 to 4 volts as stated by Jim Calvert. My meter still had the piezo disk and the plastic strap that holds it in place. The thermostat wire is just the right size to fit in the holes where the pegs were (I broke them off with my finger to remove them). The wires I used were only about 3/16 in. I used needle nose pliers to flatten the ends of the wire after putting it in the plastic, then careful put everything back together. My buzzer stopped working years ago, and it is nice to have it back I couldn't find the conductive pegs anywhere, so I hope my fix holds ups long term. I know my meter is old, but it works great for what I need it to do.