Introduction
This manual provides detailed instructions for the operation and maintenance of your Casio A158WA Series Digital Watch. Please read this manual thoroughly to ensure proper use and to maximize the lifespan of your timepiece. The Casio A158WA is a classic digital watch featuring timekeeping, daily alarm, stopwatch, and an LED backlight.
Image: Casio A158WA Series Digital Watch. This image displays the watch face, showing the digital time, day, and date, along with the function labels for the buttons.
Button Functions
Your Casio A158WA watch has four buttons, typically located on the sides of the watch case. Refer to the diagram below for their general functions:
- Top Left (LIGHT/LAP-RESET): Activates the LED backlight; used for lap/reset in stopwatch mode.
- Bottom Left (MODE): Cycles through the watch's modes (Timekeeping, Alarm, Stopwatch).
- Top Right (START-STOP/12-24H): Used to start/stop the stopwatch; toggles between 12-hour and 24-hour time formats.
- Bottom Right (ADJUST/SET): Used to adjust settings within each mode (e.g., setting time, alarm).
Note: Button labels may vary slightly on the watch face, but their positions and primary functions are consistent.
Setup
Setting the Time and Date
- In Timekeeping Mode, press the MODE button until the seconds begin to flash. This indicates the setting mode.
- Press the ADJUST/SET button to cycle through the settings: Seconds → Hour → Minute → Month → Date → Day of Week.
- While a setting is flashing, use the START-STOP/12-24H button to increase the value. Hold the button to change values rapidly.
- Once all settings are correct, press the MODE button to exit the setting mode and return to normal timekeeping.
Adjusting the Bracelet
The stainless steel bracelet can be adjusted to fit your wrist. This typically involves moving the clasp mechanism along the bracelet or removing links. For precise adjustment, it is recommended to consult a jeweler or watch repair professional. If adjusting yourself, use a small, flat-head tool to lift the clasp's locking plate and slide it to the desired position, then press the plate back down to secure it.
Operating Modes
Timekeeping Mode
This is the default mode, displaying the current time (hour, minute, second), day, and date. From any other mode, press the MODE button repeatedly until the current time is displayed.
- 12/24-Hour Format: In Timekeeping Mode, press the START-STOP/12-24H button to toggle between 12-hour (with 'PM' indicator) and 24-hour formats.
- LED Light: Press the LIGHT/LAP-RESET button to illuminate the display for a few seconds in low-light conditions.
Alarm Mode
To set the daily alarm:
- From Timekeeping Mode, press the MODE button once to enter Alarm Mode. The alarm time will be displayed.
- Press the ADJUST/SET button. The hour digits will flash.
- Use the START-STOP/12-24H button to set the desired hour.
- Press the ADJUST/SET button again to select the minute digits, then use the START-STOP/12-24H button to set the desired minutes.
- Press the MODE button to exit alarm setting.
- To turn the alarm ON/OFF, in Alarm Mode, press the START-STOP/12-24H button. An alarm indicator will appear on the display when the alarm is active.
Stopwatch Mode
The stopwatch measures elapsed time, split times, and two finishes. It has a capacity of 59 minutes, 59.99 seconds.
- From Timekeeping Mode, press the MODE button twice to enter Stopwatch Mode. The display will show "00'00"00".
- Press the START-STOP/12-24H button to start the stopwatch.
- Press the START-STOP/12-24H button again to stop the stopwatch.
- Press the LIGHT/LAP-RESET button to reset the stopwatch to "00'00"00".
- Split Time: While the stopwatch is running, press the LIGHT/LAP-RESET button to display a split time. The stopwatch continues to run internally. Press LIGHT/LAP-RESET again to return to elapsed time display.
- Two Finishes: Start the stopwatch. Press LIGHT/LAP-RESET when the first runner finishes to record their time. Press START-STOP/12-24H when the second runner finishes. Press LIGHT/LAP-RESET to display the second runner's time. Press LIGHT/LAP-RESET again to reset.
Maintenance
Battery Information
Your Casio A158WA watch is equipped with a CR2016 Lithium Metal battery, designed to last approximately 7 years under normal usage conditions. When the display becomes dim or the light function weakens, it may be an indication that the battery needs replacement. Battery replacement should ideally be performed by a qualified watch technician to ensure proper sealing and water resistance.
Water Resistance
The watch is water-resistant to 30 meters (3 ATM / 99 feet). This means it is suitable for daily use and can withstand splashes or brief immersion in water. It is not suitable for showering, swimming, diving, or any water sports where it would be subjected to continuous water pressure or submersion. Do not operate buttons while the watch is wet.
Cleaning
To clean your watch, wipe it with a soft, dry cloth. For stubborn dirt, a slightly damp cloth can be used, followed by a dry cloth. Avoid using chemical cleaners, solvents, or abrasive materials, as these can damage the watch's finish or internal components.
Troubleshooting
| Problem | Solution |
|---|---|
| Display is blank or dim. | The battery may be low or depleted. Replace the CR2016 battery. |
| Time is incorrect. | Re-set the time and date following the "Setting the Time and Date" instructions. Ensure 12/24-hour format is correct. |
| Alarm does not sound. | Ensure the alarm is turned ON (alarm indicator visible on display). Check if the battery is low. |
| Buttons are unresponsive. | The watch may be in a specific setting mode. Try pressing the MODE button to return to Timekeeping Mode. If wet, ensure the watch is dry before operating buttons. |
Specifications
- Model: A158WA Series (e.g., A158WEA-9CF)
- Movement: Japanese Quartz with Digital Display
- Case Material: Resin
- Band Material: Stainless Steel
- Water Resistance: 30 Meters (3 ATM / 99 Feet)
- Battery: CR2016 Lithium Metal (approx. 7-year life)
- Functions: Timekeeping (Hour, Minute, Second, PM, Date, Day), Daily Alarm, 1/100 Second Stopwatch, LED Backlight, 12/24-Hour Format
- Accuracy: ±30 seconds per month
- Weight: Approximately 3.21 ounces
Warranty and Support
Casio watches typically come with a manufacturer's warranty covering defects in materials and workmanship. Please refer to the warranty card included with your purchase for specific terms, conditions, and duration. For technical support, service, or warranty claims, please contact Casio customer service or visit the official Casio website. Keep your proof of purchase for warranty validation.
For more information, you may visit the Official Casio Store on Amazon.
