Flip the module over to view the PCB. Look near the battery compartment for a row of tiny, numbered solder pads (typically labeled digits 1 through 5).
If your watch is already scratched, a few minutes rub with PolyWatch compound and a microfiber cloth will restore clarity.
actually supports a countdown timer. For reasons of product segmentation (keeping it lower-featured than more expensive G-Shocks), Casio disables this feature at the factory by soldering a small jumper wire on the circuit board.
The W-800H utilizes Module 3223. Many hobbyists have discovered that while the watch is sold with basic functions, the internal chip is capable of more. casio w-800h mod
The Casio W-800H module was first introduced in the early 2000s as a replacement for earlier movements used in Casio watches. The W-800H was designed to be a more cost-effective and efficient alternative to previous modules, while still maintaining the high standards of quality and reliability that Casio is known for. Over the years, the W-800H has undergone several revisions and updates, but its core functionality has remained largely unchanged.
The most popular Casio W-800H modification requires opening the watch to alter the printed circuit board (PCB). Casio uses the same module chip across multiple watch models but limits features on budget variants by bridging specific solder pads. Removing a single solder joint unlocks a countdown timer and four additional alarms. Tools Required Precision Phillips screwdriver (size #00 or #0) Fine-tipped soldering iron or a sharp hobby knife Fine tweezers A clean, well-lit workspace Step-by-Step Instructions
A dual-function LED backlight mod that adds a red or amber "stealth" light (for preserving night vision) alongside the standard green/blue electro-luminescent (EL) panel. Flip the module over to view the PCB
For any internal hardware changes, consulting with a professional watchmaker or an electronics technician is the safest way to ensure the longevity of the timepiece. Share public link
Convert a stock DW-800H (or W-800H-1AV) into a Black & White "Stealth Explorer."
By removing a specific solder bridge, you can add a fully functional 24-hour countdown timer to the watch's mode cycle. actually supports a countdown timer
Standard digital displays can be functional but boring. These visual mods transform the watch into a custom piece. W800H-2AV | Digital Blue, Light blue - CASIO
The standard W-800H doesn't include a countdown timer in its feature set, but you can easily add it by modifying a single jumper on the PCB.