(from Yahoo Satellit-750 group, message #1148)
To turn off the beep: power off the unit. power-on the unit THEN press 0 for 3 seconds it should turn the beep off. ----------- (someone else commented that it might be closer to 5 seconds) Apparently this only works with a newer version of the Sat 750. For the early ones, some folks on the Yahoo group have disassembled the radio and physically crushed the beeper. Why they released any units that can't have the beep canceled via firmware, I have no idea. BTW, on the PL-380 the beep can easily be eliminated. I suspect the PL-390 is the same.