Size of the "O" ring that seals back 4 screw plate?

Hi,

The backplate is a "pry open" back. so you will need something like a blade or a hard thin flat object to pry the backplate. once this is done you will have access to the battery. Please note that there is a tiny Philips screw that holds the battery plate. you will have to remove this screw and then remove the battery plate. Also, note that around the case there will be a thin rubber "o" ring. this is what makes the watch water-resistant. so pls male sure you fix it back when you reinstall the watch.

Does the photo below look like the back of your watch? If yes, simply unscrew the four tiny screws and carefully lift the back plate off. Gently remove the battery, replace it and refit the back plate and screws.
*Note*. Once opened, the water resistance of the watch will be reduced as there is no longer a tight seal.

fixya doesnt sell products

Hi Dirk
Bad one having water inside your Protrek or any watch for that matter-mechanical or electronic.
It means one of your seals has failed most likely the back one.
Look carefully at the back seal, if you squeeze the back plate, and the main case between your thumb and index finger you may notice a slight movement (use x10 magnification) That microscopic gap is enough to flood your watch and the deeper you use it the bigger the flood. The problem is the case, it is made of cheap nasty plastic and over time it deforms and the rubber seal contracts. Any slight over tightening of the screws, pulls the plastic thread out and stops the back plate making a good seal between the back plate and the rubber seal in the groove of the main case. For the price one would be excused for expecting that these Casio watches had a better quality case, even better a screw on back plate (like a proper 100m depth watch) rather than the individual 4 screws at each corner and a prayer. There are ways of fixing the screw threads but it never lasts....
To get the moisture out, just remove the backplate and discard the batteries. The sooner this is done the better the chances of success. Leave the watch open, face down in a warm place, preferably loosely covered by a glass bowl to stop dirt getting inside. After few hours check if the water is gone. If on inspection of all the contacts they do not exhibit any rust or white chalky deposits. Replace the new batteries and reset the watch by shortening the reset pins. If all seems ok and you have a proper display and all funtions works. You may purchase a new seal from Casio or simply clean the existing one with a little blu-tak to remove the dirt and run A LITTLE!! bead of vaseline along the rubber top to aid the seal.
I will not use the watch under water anymore and chances are that it will be downhill for the watch from now on, sorry.
I hope this helps

I had this problem and managed to fix it. There is a small metal plate locate inside the back cover of the phone that can be knocked out of position. The small plate should be in contact with the two screws in the top right hand side of the watch (when back plate is off).

To remove back plate you must remove the strap. To do this you must remove the four pins that connect the strap to the watch body. Take out the pins and set aside. The two plastic inserts can now be removed.

Remove the four screws and remove the back plate. Be careful not to lose screws, rubber seal and small plate.

Reglue the small plate to back plate and allow to set.

Reassemble watch in reverse order and watch should work as normal.

Good luck

I like these little RC IR watches. They're great fun!!! For this tutorial, you will need....

• A small Phillips heads screw driver
• A pin (or needle)
• A replacement CR2032 battery

Instructions :

1. Remove the 4 screws from the back of the watch
2. Carefully remove the back plate, do not damage the delicate rubber seal
3. Carefully remove the delicate rubber seal
4. Use the pin to remove the small rubber block from the battery cover clasp.
5. The pin should then be inserted in the gap of the white plastic lug, where the rubber block was removed.
6. Use the pin to gently pull back the clasp of the battery cover.
7. The battery cover will then open with a 5mm gap approx. It does not need to be removed.
   
8. Use the screwdriver to remove the battery.
9. After the battery has been replaced, just follow the instructions backwards.

I hope this little tutorial has helped.

What make is this watch? sounds like the back casing is partially open.

You know where AC pads are right? If you don't know, look at the sticker. there is an arrow on the sticker. An arrow points out 11'oclock.
After insert the bettery, you just touch the golden pads with metal screw. that is how to short AC pads.

There is a reason why Bulova watches cost so much when you need to replace the battery....it's DIFFICULT! You can try the following, but I would HIGHLY recommend having a jeweler replace it for you. At one time Walmart did it for next to nothing, but I don't know if they do Bulova watches at this time, but it costs nothing to call them.
Try this AT YOUR OWN RISK:
The best choice for removing a threaded caseback is to use a "caseback removal tool", which consists of two or three adjustable "pins" attached to a handle (most WalMarts sell a two-pin tool in their jewelry department, and you can purchase a better three-pin tool from several vendors on eBay). To use it, start by placing the watch face-down on a padded surface (to avoid scratching the crystal). Adjust the pins so that they very snugly fit into the notches cut into the caseback; if you don't, the pins can jump out when you try to use it and scratch the watch. Place the tool over the caseback and engage the pins into the slots; then, holding the watch steady with one hand and the tool in the other, give the tool a counterclockwise turn to loosen the back (it may take a lot of force to do this, especially if this is the first time the battery is being replaced). Once the caseback is loosened (usually about 1/4 to 1/2 turn), remove the tool and finish unscrewing the back by hand to avoid scratching the watch. Be careful as you remove it as some watches use a very thin O-ring on the back to make a watertight seal.
Afer replacing the battery and ensuring the watch is running properly again, carefully inspect the surface of the case and the threading on the caseback and remove any dust or grimy deposits with a soft cloth. Then, place the caseback onto the case, being careful to align the O-ring or other seals, as well as the caseback threads (tip: to ensure the threads are lined up, place the back on the watch and turn it counterclockwise about 1/2 turn or until you feel the ends of the threads "fall" into place). Screw the caseback down as far as possible by hand, then use the removal tool to tighten it the rest of the way.

The plastic wrist band doesn't have to be cut away. You need to dislodge the spring-loaded end of the pin from the hole in the plastic with the blade of a sharp thin knife.

The you proceed to lift one of the 4 snaps to open the cover. The battery is under a white translucent inside cover.

The original battery was Sony SR621SW.

Pay attention to the rubber seal ring when putting the watch back together.