Http://protrek.casio.com/resource/manuals/module_3246.pdf
At the top of page 3 is instructions to change the time. Notice in the diagram there is a step in which you have the choice to turn off the tone. Try that.
Secondly, try entering alarm mode, as described at the top of page 2. I suspect you have some alarm set. Remove it if you find it there. Note that you only have a couple of minutes in which to make the alteration before the watch automatically kicks you out of the alarm mode.
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