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The BC780XLT is a 2000 model, so your 'new' scanner is actually about 10 years old. Your lack of volume control indicates that the ON/OFF/VOLUME control 'pot' is defective and needs to be replaced. It looks to be on the same shaft as the SQUELCH, so the Uniden part is likely a combination of the two controls. I suggest that you contact Uniden Customer Service (see link below) and inquire about parts availability and/or factory repair. Due to the age of the unit though, there's a good chance that the control is no longer available - unless it's being used on a newer model as well. Your other option is to try to work out a return or file an eBay/PayPal claim. Sorry to be the bearer of bad news.
Uniden BC780XLT Operating Manual. With the new SmartScanner™ feature, you can also automatically program your scanner by downloading directly from our Uniden/Bearcat national frequency database via a PC or external modem. Lots of good informatio n about the BC 780 XLT × Bookmark ×. The BC780XLT is a state-of-the-art radio with TrunkTracking™ and automatic scanning capabilities. It can store frequencies such as police, fire/emergency, marine, railroad, air, amateur, and other communications into 10 banks of 50 channels each. With the new SmartScanner™ feature, you can also automatically program your scanner.
Listening in since the 60's Answered on Nov 09, 2010.