On the standard W-800H module, pad ch3 or digit 4 (depending on your specific module iteration) is bridged with a tiny blob of solder. Use a hot soldering iron to carefully wick away this solder blob. Alternatively, you can use a sharp hobby knife to scrape and cut the connection, though soldering is safer for the board.
Opening the case involves removing the factory seal. If the gasket is not perfectly reseated or lubricated, the watch will lose its 100m water resistance rating.
If you are looking to explore watch customization further, there are many non-invasive aesthetic modifications to consider, such as:
Before we break out the screwdrivers and bezel inserts, we must answer: Why this model? Casio produces dozens of square and rectangular digitals. Why mod the W-800H? casio w-800h mod
Reassemble the module. Crucially , locate the "AC" (All Clear) pad on the module. Use your tweezers to touch the battery to the AC pad for a second to reset the watch.
Optional: A small scraper or needle if not using a soldering iron Step-by-Step Timer Mod Procedure
: Similar jumper modifications can expand the single stock alarm into a multi-alarm system (up to 5 alarms), though the display lacks specific indicators for which alarm you are currently editing. Solder Tip : While risky, users often use solder wick On the standard W-800H module, pad ch3 or
Reset the module (short the "AC" pad to the battery) to refresh the firmware and display the new "TR" (Timer) mode.
: Most modders use a heated, sharpened screwdriver or a soldering iron with solder wick to disconnect the specific jumper pad.
Disclaimer: This guide is for informational purposes only. Clockwork modifications and the use of soldering tools should be approached with caution and appropriate safety measures. YouTube·Sam's Watch Review Opening the case involves removing the factory seal
The W-800H is rated for 100 meters. Once the factory seal is broken, it is very difficult to guarantee the same level of water resistance without professional pressure testing and proper lubrication of the gasket.
Place the module back into the case. Press the Mode button to cycle through the screens. You will now see a TR (Timer) mode added to your menu, and the alarm mode will allow you to cycle through five separate alarms instead of just one. Replace the gasket and screw the back plate down evenly. 🎨 Aesthetic and Comfort Modifications
to cleanly remove the jumper connection to avoid damaging other components. 2. Display & Aesthetic Mods