Question about Casio G-Shock GW300CA-1V Wrist Watch

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Battery replacement for a G-shock.

I have a g-shock that died. I replaced the battery but got nothing. On the back of the case are the following numbers, 2163(in a box) followed by DW 9050... IN THE WATCH WERE THE FOLLOWING INSTRUCTIONS:( AFTER BATTERY REPLACEMENT, CONTACT AC WITH BATTERY+ USING TWEEZERS. I DON'T UNDERSTAND WHAT THE CONTACT WITH AC MEANS. DO I HAVE TO REMOVE THE BATTERY AGAIN TO DO THIS?

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  • Albert3661 Jul 01, 2008

    after, I had the battery change on my watch. The alarm does not work any more. Please help.

  • metalfury Oct 31, 2013

    When you open the back there is a tiny spring that connects the watch to the back plate. The back plate contains the Piezo speaker for the alarm. If the spring is lost or not making contact with the back plate then your alarm will not sound.

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The reset trick works with other Casio Alarm Chrono digital watches, such as my old Model W-720, as well. After the new lithium coil cell is installed and secured with the spring clip, the watch may show random segments in the LCD display or may simply be blank. Insert a sewing needle, paper clip, or blade of a small jeweler's screwdriver into the hole on the back of the movement stamped "AC" (All Clear) to momentarily connect the gold plated contact at the bottom of the hole to the stainless steel battery clip. The battery clip in most such Casio watches is connected to the "+" terminal of the coin cell. This will reset the CMOS chip and it should start up with the watch displaying 12:00 and the date at 1-1. Then, use the control buttons to set the time and date in the normal fashion.

Posted on Oct 29, 2008

  • wolfmech_ Apr 08, 2011

    Thanks a lot, you are right!!

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It means you need to "short" the watch for it to strat back up.

Posted on Jan 14, 2009

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Thanks guys, the two solutions above worked with a Casio TRT-500. I have to play with a few exposed contacts to get the right connection as the AC was not properly marked. Saved me the cost of a new watch!

Posted on Jun 18, 2009

  • sammynomas Nov 30, 2010

    Thanks a bunch....had two G-shocks out of commission and used this tip to get both back in service!!!

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Take a paper clip put one end of it into a hole labeled AC and the other end labeled ground (gnd or -) (not + as stated in your post). You need to externally complete the circuit before the watch display will turn on. Also watch how you install the back plate. It may only go in one direction (to complete circuits for some of the switches).
Good luck

Posted on Mar 29, 2008

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It is marked as (+) on some models

Posted on Oct 16, 2008

Thank you! =)

Posted on Jun 11, 2008

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How to replace ctl1616 battery in casio g shock

Posted on Apr 09, 2008

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