How do I adjust gw 300 g shock watch

With most watches, use an Exacto knife to compress the pin to remove it. Replacing the pin is more difficult.

From the main time display, hold down the adjust button until it beeps and your time zone is flashing on the bottom of the display. Then press the mode button once. [AUTO/ON/OFF] DST will be flashing on the bottom. Use the Time Memo and/or Receive buttons to cycle the mode. When it's what you want, press adjust twice.

mcdevito75 here, Possibly the battery is worn out. An old battery will not hold a charge, Visit a small watch repair shop in yourarea for a new battery.

If you haven't got instructions on how to do this, you can get
instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

http://world.casio.com/wat/download/en/manual/
?
There are so many aplications use of the manual will be manditory.

Use the four numbers on the back of your watch and you will have a PDF version of your instruction manual.

Hope this tip helps
R/
David
http://antiqueclock.clockstop.com/

I have a Casio g-shock gw-330a and now find myself again replacing the band. So far, $60 on bands. They last me two or three years. To install the band, take the band and watch to a Jeweler. My local Sears does it for me. $5 for installation; $5 for purchase shipping; $20 for band. $30 every couple of years.
This cost disturbs me.

Check out this YouTube video which walks you through the battery change process:

http://www.youtube.com/watch?v=ogCz2vjUKVg

I just replaced mine, same model, there's only 1 battery in it.

Change the battery. This happened with mine along with the battery needing charging more frequently. In my opinion, Casio's assertions that you won't need to change the battery is pretty much of a joke. My jewler concurred.

After changing the battery I can now press the light switch button and the watch works normally.

Tony

My watch had the same problem and i could never figure out what it was so i just lived with it for a couple of years. then, just recently even when my watch was getting plenty of sun the battery would die in the evening and shut off at night. so i replaced the battery and evrything works great. even the light which leads me to believe the solar panel is just a gimmick. i have an old g-shock watch that i bought in 1989 and it still works and is on the origional battery. my gw 300 is about 5 years old and needed a battery. i guess 5 years on a battery is prety good but i would rather have it last for 19 years like my old one.