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Re: please help me to replace battery on my casio F-91W
This reset trick works with other Casio Alarm Chrono digital watches,
such as my old Model W-720, similar to your F91-W. 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.
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Those batteries are compatible. The reset isn't working right. You may need to send the watch in, or take it to a repair shop that is familiar with that watch. You can probably find one in any large mall...
You need to Shortcut the battery with AC contact. AC can be found on the sides of watch movement(very tiny). You have to use pointed tweezers: one end on battery+, another on AC contact for three secs to get the watch started
Make sure your new battery is not flat and on full power. Sometimes batteries are not fully charged as they discharge over the time and as they are stocked in large quantities, some of them get discharged even they are sold as brand new. When replacing battery in your watch, make sure you keep the right polarity. Plus and minus must match appropriate contacts. After replacement connect AC and plus side of the battery at once for 2-3 seconds - this will reactivate watch and you will need to set the watch manually. If you did all this and your watch don't work at all, there is some fault in watch mechanics and you have to look for watchmakers help.
This is an old problem, but maybe this will help someone changing a battery on a Casio. Many Casio watches must be "zeroed out" by putting an pointed tweezers between the back of the battery and the AC terminal off to the side of the battery. On my old Casio Telememo 50, the AC terminal is in a very small hole just above the battery. On the Baby G force, it was in a wider opening, way at the edge of the watch. It has something to do with resetting the watches circuitry so it will operate again. Good luck!
Most of these resin-case F-series Casio sport watches use a fairly large lithium coin cell battery. Once the four screws holding the watch back are removed, you should be able to just pop off the stainless steel spring clip that holds the cell in place and pull it out, without having to remove any more screws. Be careful when replacing the clip, because it is asymmetrical and goes in only one way. Also be careful not to lose the tiny spring contact that connects the watch movement to the piezoelectric sound element glued to the watch back. If you lose the spring, the watch will still run, but the alarm won't sound anymore.
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.
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.
I was just gifted an old casio pathfinder model 1675 with the manual.
when inserting a new battery.....step #4
AC (AC CLEAR) touch the AC contact and the battery +(positive) side with metal tweezers for about two seconds. Contacting the AC (all clear)is necessary when a new battery is installed to clear the previous memory to avoid erratic display.. I am going to get a new battery for it soon I want to play with it....and figure out how navigate through the functions.
oh yah......the pictures are extremly small but the AC contact point is apparently marked? inside the case obviously next to the battery close enough for the needle nose tweezers to reach each contact. I havent unscrewed my case yet, I want to have everything I need at hand like the battery before I dive into this thing. I dont mean to dumb it down, I was trying to keep it simple as the manual is 55 pages and a little confusing. I hope this helps the battery problem. I will try to delve into the reset problem from the other post..each function appears to have a reset option ......maybe crack the case open and try the new battery all clear thing with tweezers...maybe this would reboot so to speak the entire watch , being mine does not work and have only had it in hand for two hours I am pretty clueless, I was looking for how much the watch costs...i didnt relize it was a fairly old model, the new ones with the compass look very cool. anyhow goodluck