My Garmin 2720 has recently developed a problem of losing its ability to "speak."
Switching the unit on normally and asking for it to provide directions to a given location, the unit begins performing normally. But after 5 to 10 minutes of normal operation, a spoken direction will be garbled, and then after that there is no sound at all.
Immediately switching the unit off and then on has no effect. Leaving the unit off for several hours will result in the pattern above where it works for a little while and then goes silent.
It sounds like the audio power amplifier is failing in the unit, it's kinda classic for an audio amplifier to fail when it gets hot, then work again when it cools down.
I'd suggest deleting the language you're using, then reload v7.2 firmware and the language. No reason why this should work, but it doesn't cost anything. If not you're looking at a $250 Garmin flat rate repair.
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Log into your account at www.garmin.com by using the myGarmin link. With the unit connected to the computer go to the myDashboard link. Your Street Pilot 2720 should show up on the dashboard. From there you should be able to apply the update. You may also want to contact Garmin support for assistance. http://www.garmin.com/us/support/contact
When you plug in the USB cable, if your System, Hardware, Device Manager lists "GARMIN Devices", then the problem has to be in your network connection or Garmin WebUpdater. If your Device Manager doesn't list "GARMIN Devices" then the problem is in the computer, USB cable, or 2720.
I have three 2720s right now with bad USB ports. I'm going to try replacing the USB driver chip in each unit, but now I'm just guessing. Hope this helps. Tom
When updating the maps, you need to be registered with Garmin. All the numbers came with the unit. If you turn over your Garmin 2720, there will be a number flanked by "*". That is your unit ID. When you register, you must provide that ID. From the site, you can update your maps and you shouldn't need the 25digit key. It's programmed into your unit.
Check to see if "Recent Selections" contain any of your favorites. You can then rebuilt Favorites from the Recent Selections. If the Recent Selections contain any of your favorite just select it and then select Save.
Garmin normally replace your unit with a refurbished unit. Yes call Garmin and ask for a new unlock code. Normally they provide a new registration ID (yellow piece of paper with the unlock code for the latest mapsource map and accessories which it also included with the refurbished unit.
Mine just started doing the same thing. I took apart the speaker power cord, but don't see anything wrong with it. I thought I saw the unit turn off/on one time when I moved the cigarette plug back and forth, but as I said the wires are fine. I have the power cord apart right now and have 12 volts hooked up to the wires directly and the unit has been sitting here for 30 minutes without resetting.