Justice Gustine wrote in
:

Have this from the bit vault:




Look in your service manual for J4 which comes off the control(CPU)
board.

Pin 5 on the ribbon cable is clearly marked "BEEP". Remove the
ribbon cable from J4 and bend out the wire that goes to Pin 5.
Bingo, beep gone.

Or better yet,install a switch like I did.
You'll miss that beep at times,like when entering a bunch of freqs.
The beep is a confromation that the key was indeed pressed.