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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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The 395 is a lower power output but same voltage (1.5v). The power spike of shorting might have caused a spike in the watch electronics.. make sure they are right polarity too. These batteries are not high current items, but maintain their voltage over the 5+ year lifespan. The S and SW are basically interchangable except for the higher amerage output.
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...
To reset the watch, you need to 'short' the reset point with the battery. To do this, with the watch face down and the back removed the 'Reset' point is in the bottom right hand corner (a gold-coloured contact point). Use a pair of metal tweezers or an unbent paper-clip (anything as long as it's metal and will touch the reset point and the back of the battery at the same time). Maintain contact for about 5 seconds and you should get the display back. I've just changed the battery in my SDB 500W and the above method worked. I did lose the audible 'beep' though and I'm currently on the net trying to find how to get it back. That's how I found your question... :)
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!
I have a Timex Digital Heart Rate Monitor 585 (product code T5C351F5)m, which has the same Short AC Pad and battery +ve message. There is an arrowhead pointing to the pad. It's a raised metal platform - a bit different to some of the Ironman's mentioned above. Here is a pic...
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.
there usually is an AC contact point to reset digital watches. Touching the + and the ac point with a conductive wire usually resets the watch. Not sure about the spring- I'm not going to open my Tissot up unless I have to.
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