Question about Garmin Forerunner 305 GPS Receiver
It is only a year old.
I have had the same problem. To fix it, I simultaneously hold down the "mode" and "reset" buttons for about 10 seconds. After releasing the buttons I power it up as normal. This has worked both times it has happened, and I got this fix from the Garmin website. My mileage totals are still in the history.
Posted on Feb 26, 2009
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Posted on Jan 02, 2017
For Pc users:
Go to Garmin website Updates & Downloads, Training Centre for Windows software version 3.4.1, click on download.
I previously deleted all saved couses on Training Centre, but don't know if this is relevant.
Posted on Jun 02, 2008
SOURCE: opening forerunner 305
I have a problem with my 305 whereby the mode button stopped working so semi pulled mine apart.
If you look at the 305 from the side you can see where the rubber bit covers the buttons. The bottom of the rubber bit is attached to the rear of the forerunner - don't try to detach it - I munted mine a bit detaching it. At the top of the rubber, nearest the face you'll see a small gap. Follow the gap anti clockwise from the power button down to bottom left corner of the face near where the wrist strap pin is. Here you'll see the gap is plastic on plastic on plastic. I believe a thumbnail or similar in here and worked around carefully will let you pry the face off. I stuck my thumbnail in there and got the face to lift 1-2mm before I backed off. Note I didn't go any further than that.
For my problem by the time I had munted the rubber cover and was able to operate the mode button with a paperclip I new it was dead so didn't bother going any further as I could still use the 305 in reduced mode without mode changing.
Posted on May 03, 2009
You need a new battery. There is a small chance there is a hardware problem but about 99.9% of the time its just the battery giving up.
Posted on Apr 01, 2010
Testimonial: "Just what I needed to know. "
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