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limited info generic answer if its the lower $ end units-- pop off the back --and remove internals careful of springs for buttons --check for debris -failed spring-button bi-metal fail /damaged
A detailed description of this procedure is found in the manual of your watch. You can find the right manual with the module nr. on the back of your watch (4 digit number in a rectangle)
The manual for your watch can be downloaded via the link provided below:
from the user manual press the button closest to the seconds display on watch . bottom right button in normal time display to switch between am / pm time or 24 hundred military time. http://mygshock.com/casio-manual/548/
enlarge the internet browser display to read which button to press to change the time or date.
press button B top left button to go into change mode
press button C bottom left button to move to seconds or minutes or hours .
press button A bottom right button to advance the time
press button b top left button to go back to normal time display
probably one of the buttons of your watch is stuck that's why you cannot use the other buttons of your watch. it has to be opened and check for it, mostly of the button that are stucked with this kind of watch is the illuminator or the light located at the lower middle of your watch. i hope i had helped you.
Press the "mode" button (bottom left) until the display says "HS" then press either the top right or bottom right button (depending whether you want to advance or ****** the hands) until the hands point the correct time.
When you have finished, press the mode button until the display returns to normal.
If you have any problems, (I have given you instructions that apply to my Casio, which is a different model, then you can get instructions for your model 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
usually when the watch still works but you cannot make or change any settings and you do not see any reaction or change when you push a button, then it means that one of the buttons is stuck (as if permanently pushed) and the watch will not react to any button until the stuck button is released. Inside the watch there are metal fingers (contact blades) that the buttons actually push, and sometimes one of these finger blades can get stuck even though the button has returned outward. try (with tweasers) to pull on each button to see if it will move outward and allow the watch to start functioning again. If not, then the watch must be opened,and with a fine pin-like probe, each metal finger blade must be tested for proper movement and position. Also, when a battery is replaced, occasionally the housing is not seated correctly when the "movement" is replaced in the housing (if it was removed in the first place), when the cover is back in place, if there is a plastic or metal bezel ring, maybe the ring is not seated correctly. goodluck, Macgivor
open the backside.
probably the light switch contact at the six side of the watch (attached to the steel mainframe) may have contact with the electronic cirquit
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