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Have the same problem, Casio PRG-80L reads open. No hints about this in the manual. Nor did Votit's suggestion help. Note that although the watch is old there is clearly power left in the capacitor battery. Ended up accidently ito this mode when resetting the time. Assume the open mode is intended for service, but would just like to exit.
Same problem with my SPF-40, module 2273, after a small helical compression spring, silver color, fell out. I could not determine where it is suppose to be located. It could be the barometric reference spring for sensing the barometric pressure.
You can do it yourself. Unscrew watch caseback and undo the contact on top of battery. Read the writings on battery and buy exactly the same one. Do not mind manufacturers (Casio, Maxell, e.t.c.), just make sure the numbers are the same. Some watch casebacks can be opened only if the watch band is removed, so, remove it if needed, just don't forget to memorize where every part and screw was fitted. Memorize how the battery is fitted and do not put the new one the other way around as this can damage your watch. Actually there is nothing difficult - only you have to put everything back exactly the same way as it was. If your watch will be left without battery for more than 3 minutes, you will need to reset your watch after replacing a new battery, but it's easy if you've got users manual. Good luck.
There is a very small sticker with very small red print just adjacent to the battery compartment. This little sticker states "once batteries are replaced, you need to touch AC with tweezers". I did it with metal tweezers and the watch display came to life. Good luck!
There is this little spring which fits in one of the small holes in the watch. When I tested my watch without the spring, there was no beep. With the spring in place the sound worked nice again. So (IMO) apparently the little spring is used as contact between the watch en the "speaker" placed at the back of the watch.
The silver spring goes in a very small hole in the plastic casing on the bottom side of the watch located next to the wristband under the sensor. Hope this helps
If you look very closely you will see that one side of the clip goes nearly under the battery. the plastic there has what looks like a small hole near the metal. It is in fact a slot. use a straight pin inserting it in the slot and gently moving the clip away from the battery. There is bend tension on the clip and it should raise slightly when released. Then use a tweezer grab the battery.
use your tweezer to hook the clip back over th plastic after you insert 4 new batteries.
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