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Hello there: please follow these instruction and this should help if not let me know and i willcontinue to get you more information for you nstructions
the screen of the Garmin StreetPilot C340. If the touch screen does not
seem to respond when you hit it with your finger or a stylus, you may
need to calibrate it. To do this, turn the unit off and then hold down
the "Power" key for approximately one minute. You will see a
calibration screen come up that will recalibrate the GPS unit.
the Garmin StreetPilot C340. If your GPS unit is not responding or is
stuck on a particular screen, it may need to be reset in order to
operate. To reset, remove the face plate of the unit by gently prying
it off. Locate the "Reset" button under the face plate and press down
in order to restart the device.
the fuse of the Garmin StreetPilot C340. If the fuse blows on the GPS,
you will need to make a replacement using an ACG/3AG 2 amp fuse.
Unscrew the adapter cord at the end and remove the fuse found there.
Put in the new fuse to see if this returns function to the unit.
the software for your Garmin StreetPilot C340. If the GPS is not
providing you with correct directional information, you may need to
update the software or download new maps onto the device. Connect the
Garmin StreetPilot C340 with the USB cord to your PC and log on the Garmin website for available updates.
Try resetting the unit. Remove the faceplate (there is an indentation at the top) and press the Reset button on the right side of the unit. If this does not help, there is a Master Reset, but it WILL ERASE ALL OF YOUR FAVORITES. If you have to do this, press and hold the bottom right of the screen and press the power button until the unit resets.
Have you tried a hard reset? Take off the silver trim ring around the screen by hooking a fingernail under it above the screen and lifting it off. There's a reset button at the side of the screen. Press that for a few seconds and it should re-boot the unit.
I had the same problem, the face plates comes off by sticking your finger nail under the little notch under the garmin symbol and pich off the thin face plate, there is a reset button under the face plate in the middle of the right hand side of the edge of the face plate( visible when the face plate is dislodged. I held the button in for a second or two, you can feel the button recess as you push down on it) and the unit resets without disturbing the existing programed route
Champ...If your 340 stops responding, try turning it off and back on.If this does not help, reset the 340.
1.Unplug the power and the usb cables to remove external power.
2.Place your thumbnail in the groove located under the Garmin logo on the faceplate and gently pull off the faceplate.
3.Press the reset button for about 3 seconds.
4.Connect the 340 to a power source using power cable. The 340 should automatically turn back on and operate normally.
Good Luck ... Ginny