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to change the battery in a champion watch:
(1) remove the back, (2) carefully peel loose the foam strip and set it aside (3) release the battery retaining bracket with a needle or awl and tweezers, (4) grasp the case with your thumb and forefinger so that your thumb is holding the works inside the case, (5) turn the watch over and the battery should fall out (6) put the new battery in the holder, (7) snap the retaining bracket back in place (8) replace the foam strip (9) replace the back
If you take a jeweler's lupe near where the arrow is you will see the word "reset" in the plastic. There is a deep hole in the plastic with contacts below. That is the reset, and that is why you must use very sharp pointed tweezers to make contact with the back of the battery.
I think if you do not have sharp tweezers, you can probably put a sewing pin down the hole, and then connect with a small screwdriver to the back of the battery..
To reset contrast on the sunnuto t3d hold down all 4 corner buttons at once, this will place the watch in sleep mode. Wait a few seconds and press any button to wake the watch back up. This will allow you to run through the inital set up just like when you got your watch, alot of your info will be saved so you can just quickly confirm them with the mode button. I also set my contrast too high, I have reset it to 3 and found it much easier to read in all lighting.
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... :)
If you changed battery yourself, you've lost the tiny spring without noticing it. Carefully check around the place where you changed the battery. The spring itself is very, very tiny, so, be as concentrated as much as you can. That spring (coilspring named by watchmakers) transmits the signal from watch movement to the watch back cover where the sound membrane is located. In case if you find it, open the watch and insert that spring with the bent out end first in to the desired hole in watch movement (should be named COIL SPRING). After that re-assemble watch and the sound should work.
I replaced my battery too...same watch same ugly condition where you can't set time nor does the light work.
I do know what the problem is: there was an ultra small copperish spring...about 1/6 the size of the other little wire spring that you have to short with twizers to reset time. Anyway, I lost this part...and even if I found it, I wouldn't know where it goes. I came on-line to find where the missing part goes...but everyone has the same issue as me. any jeweler would loose this parts just like me...it's the master contact the enables power to all the side pushbuttons
mcdevito75 here, Casio uses an LCD crystal, Liquid Display Crystal, during a battery change any, any un do pressure remopveing or replaceing the battery could destroy the LCD. Take my advise, with a casio watch, look for a small watch repair shop in your area for the battery change. I"ve ruined many of my casio watches during battery change.
If you lost the spring, I can't help. But repairs like this SHOULD be done carefully on a mat or table to help contain parts. My Timex watch made no sound after I changed the battery. I was unsure what the internal plastic sheet meant when it set something like short to reset. BUT, as shown elsewhere on this FixYa site, simply turning the back cover 180 degrees restored the sound, and the watch works great again!
It appears that the watch was malfunctioning which I thought was due to a change of battery being required.
(It was running slow and giving the wrong time - so my mother told me)
I subsequently found instructions for the watch on an internet site, changed the battery and the watch is still failing to set to the U.K. time zone therefore, I deduce that it is a failure in the watch rather than the need for a new battery or ranything I have or have not done.
I guess the blue faced SEIKO is a Flightmaster (Model: 7T92- OCFO)and it is a great watch. This is a common problem with most chronographs and this happens due to misalignment with usage.
All you need to do is pull out the locking crown all the way out (2nd Step) as if setting time. and then press and hold the top / left button and at first the milli seconds hand resets. after which you have to press the borrom / right button to move the seconds hand in to place. and then reset the time and lock the crown. You can repeat this for Milli Seconds, Seconds, Minutes & hours hands.
Hope this helps,
Krishna Chaitanya GT.