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Casio 4305 runs 5 minutes slow.

My Casio 4305, about 3 years old, recently started running 5 minutes slow.  I had the battery replaced, then re-set the watch manually.  I watched the hands twirl round the face and then stop -- at 5 minutes later than the correct time.
Can you help ?  We are on London time.

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  • eyremail Jan 05, 2009

    Sorry, I ought to have said "5 minutes EARLIER than the correct time."

  • eyremail Jan 06, 2009

    Thank you for your suggestion.  Yes, I do know the manual, and have followed the steps in it.  However, when I carry out the formula to set the hands manually, the second-hand jumps, not to midnight, but to 2:10, and I never get the required display.  I shall persevere with that, but meanwhile my question is "Why should the watch, when it is re-setting itself, arbitrarily choose a time different different by about 5 minutes from the time transmitted by the wireless signal ?"

  • eyremail Jan 06, 2009

    I just now carried out 'Manual receive.'  The indicator showed signal-strength between A0 and A3.  The second hand once again stopped at 2:10 instead of 12, and, after completing the whole process, the watch is still running 5 minutes behind the correct time.

  • eyremail Jan 06, 2009

    I have now carried out 'Manual set.'  To get the right time, I must cheat by telling the watch that (1) it is 3 o'clock, when it is really 4  and (2) it is 52 minutes past, when it is really 47 minutes past.  Silly of me not to think of that before.

  • grahampye Apr 01, 2009

    For me, it was half an hour slow, and it started happening after the automatic change to summer time/daylight saving. I fixed this temporarily by resetting the "home" position of the hands. However it's now lost half an hour again. Does this just mean I need a new battery, or is the watch likely to be broken?


  • Anonymous Mar 27, 2014

    either 3 minutes slow or 4 minutes too fast



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No reason to panic as your watch hands can be advanced to desired time. Her is the link for your watch users manual download:

Save it on your PC and follow instructions how to set the time.
Don't forget to rate, please.

Posted on Jan 06, 2009

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Adjusting the home positions:
Hold down a+b for about 5 secs. If the seconds hand is not at 12, the home position is "off". If this happens, press a to move the second hand in 1 sec steps until it reached 12 o'clock. Now press b to adjust the hour and minute hands. If not at 12, press a hands will move in 20 second steps until they are at 12. Press b, watch returns to timekeeping mode and should now show the correct time. (:

Posted on Feb 28, 2009


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