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Steve I'm still trying to track down an electronic (PDF) users manual for the Whistler 750 and came across this website.....They don’t list your exact Model but there is some contact information that will be very useful.....good luck and I'm still looking….if I come across it I will forward it on….. Here is the link http://www.whistler-radar.com/man.php I hope this helps, cbinny1
Sounds to me like the internal speaker went, this is actually common on radar detectors. Although 9yrs is a lot longer than most will last. If you are handy with a soldering gun you can replace the internal speaker with a new one and get it working again. However be sure to take the unit apart before getting a new speaker so you can match up the size as it varies.
I have the same detector and my sound just went out, I called the number on the label on the bottom. They where very friendly and told me that it was more than likely the little speaker, they sell them for $8, if you are handy with a soldering iron its a simple task.
Call bel, the number is on the label on the bottom, I am having the same problem with mine, he was very helpful and said it was probably the speaker which they sell for $8. If your handy with a soldering iron its simple repair. Or they offer a trade up service, giving you like $80 towards a new unit.