Question about Garmin StreetPilot c340 GPS Receiver

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USB port defective

GPS USB Port overloads PC or Laptop USB ports.

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Have you tried another USB cable? As long as it's got the same mini-USB connector, they are universal. Most digital cameras use these same cables, as well as many MP3 players and other handheld electronics devices.

If this doesn't fix it, most likely, it's a defective USB interface chip in the unit... and will need to be serviced. GARMIN 1-800-800-1020 (USA).

Fortunately, the USB ports on PC's are protected. When an overload is detected (> 500mA), the USB controller shuts down the offending port. This port can then be restored manually through the USB disgnostics, or simply shutting the PC down, and restarting it.

Posted on May 04, 2008

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Why can't my PC detect Garmin 255W when I plug it via USB?


First makre sure that the usb is working. Just plug anythign into the usb port and if it detect it we know that is working.

Now with the GPS plug the usb cable into the port you tested then plug the gps on the other end. Watch your screen (PC) and see if it detects the gps. It should say one of two things. One will be device discovered Garmin GPS (something along that line) or it may show USB storage device. You can plug it in and look under my computer for these if you missed what it said. Some versions of windows are better than others at detecting whats connected. And some hardware is better than other at detecting something on a connected usb cable.

You should also plug the cable into a differant port if you had left it connected and were getting this problem. And you should try plugging both into a differant computer if you can. Doing these can tell you if the problem is the gps, the cable the port or the computer itself. Usually just changing the port is all it takes.

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Unit goes into computer mode when I plug in the car charger lead. I go through the 'loading maps' screen, then the PIN screen, and it defaults to computer mode and I can't get any maps to show.


The rear mini-USB port is defective, making the unit think its connected to a PC. The port needs to be resoldered or replaced. Please see this link:

See the section about the PC icon.
http://www.sharc.net/gps_charger_repair.htm

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Trying to connect from USB laptop to parallel printer


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An error message stating that the device overloaded the usb port appears (yellow light at the port).


Go to the device manager and uninstall all usb devices. Turn off computer, unplug all usb, reboot twice, plug usb in again. Also helpful are troubleshooting usb articles here and here.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!



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It is more than likely a defective USB cable. I am on my third cable. They don't stand up to the abuse.

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You may have to run the program with administratve rights. (I had some trouble after getting a new laptop with Vista, that fixed it).
It may also be a faulty port on your gps, or a breakage in the usb cable... Or it may be broken...

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