Introduction
This manual provides detailed instructions for the operation and care of your TIMEX TX T3B901 730 Series Classic Fly-Back Chronograph Dual-Time Zone Watch. Please read this manual thoroughly to ensure proper use and to maximize the lifespan of your timepiece. This watch features a proprietary six-hand movement with four independent motors, a fly-back chronograph, an electronic compass, and dual-time zone functionality.

Image: Front view of the TIMEX TX T3B901 watch, showcasing its black sculpted dial, luminous hands, dot hour markers, and stainless steel case and bracelet. The bi-directional black ion-plated bezel with a compass scale is also visible.
Setup
1. Initial Time and Date Setting
- Unscrew the Crown: Locate the crown on the right side of the watch case. Gently unscrew it counter-clockwise until it is free.
- Pull Out the Crown: Pull the crown out to the first or second click position, depending on whether you are setting the date or time. Refer to the specific movement instructions for precise crown positions.
- Set Time/Date: Rotate the crown to adjust the hands or date display. For time, ensure you differentiate between AM and PM if the watch has a 24-hour indicator or date change mechanism.
- Push In and Screw Down the Crown: Once set, push the crown back in and screw it clockwise firmly against the case to ensure water resistance.
2. Bracelet Adjustment
The stainless steel bracelet can be adjusted by adding or removing links. This procedure typically requires specialized tools and is best performed by a qualified watch technician to avoid damage to the bracelet or watch case.

Image: The TIMEX TX T3B901 watch packaging, including a black presentation box, a watch cushion, and the instruction manual. This image illustrates the typical contents upon purchase.
Operating Functions
1. Fly-Back Chronograph
The fly-back chronograph allows for rapid consecutive timing events. Press the top pusher to start the chronograph. Press it again to stop. To reset and immediately restart, press the bottom pusher while the chronograph is running. To reset to zero when stopped, press the bottom pusher.
2. Dual-Time Zone
Your watch features a dual-time zone display, allowing you to track a second time zone simultaneously. Consult the detailed movement instructions for specific button operations to set and adjust the second time zone. This typically involves using one of the pushers or a specific crown position.
3. Electronic Compass
The integrated electronic compass provides directional readings. To activate, typically press a dedicated pusher. Hold the watch flat and rotate slowly until the compass hand stabilizes. The compass features magnetic declination compensation for improved accuracy based on your geographical location. Refer to the full manual for calibration procedures.
4. Tachymeter
The tachymeter scale on the bezel is used in conjunction with the chronograph to measure speed over a known distance (e.g., 1 kilometer or 1 mile). Start the chronograph at the beginning of the distance. When the distance is covered, stop the chronograph. The number on the tachymeter scale corresponding to the chronograph second hand's position indicates the average speed in units per hour.
5. Water Resistance
This watch is water resistant to 100 meters (330 feet). This rating makes it suitable for snorkeling and swimming. It is not suitable for diving. Always ensure the crown is fully screwed down before exposing the watch to water. Avoid operating pushers or the crown while the watch is wet or submerged.
Maintenance
1. Cleaning
Wipe the watch case and bracelet regularly with a soft, dry cloth. For stainless steel, a slightly damp cloth can be used, followed by a dry cloth. Avoid using harsh chemicals or abrasive materials, which can damage the finish or seals.
2. Battery Replacement
As a quartz watch, your T3B901 is powered by a battery. The battery life typically ranges from 2 to 5 years, depending on usage of functions like the chronograph and compass. When the battery needs replacement, it is highly recommended to have it done by an authorized service center to ensure proper sealing and maintain water resistance.
3. Storage
When not wearing the watch, store it in a cool, dry place away from direct sunlight and extreme temperatures. The original watch box or a watch case is ideal for protection.
Troubleshooting
- Watch Not Running: Check if the crown is fully pushed in and screwed down. If the watch still does not run, the battery may need replacement.
- Incorrect Time/Date: Refer to the "Initial Time and Date Setting" section. Ensure the crown is pulled out to the correct position for adjustment.
- Chronograph Not Resetting to Zero: This may require a chronograph hand calibration. Consult the full instruction manual or an authorized service center for specific calibration steps.
- Compass Inaccuracy: The compass may require recalibration, especially after exposure to strong magnetic fields. Refer to the detailed manual for compass calibration procedures. Ensure you are not near large metal objects or strong magnetic sources when using the compass.
- Water Inside Watch: If condensation or water appears inside the watch, immediately take it to an authorized service center. Do not attempt to open the watch yourself, as this will void the warranty and likely cause further damage.
Specifications
| Model Number | T3B901 |
| Movement Type | Quartz (Proprietary six-hand movement with four independent motors) |
| Case Material | Stainless Steel |
| Case Diameter | 46 mm |
| Band Material | Stainless Steel |
| Crystal | Scratch Resistant Sapphire Crystal |
| Water Resistance | 100 meters (330 feet) |
| Functions | Chronograph, Date, Compass, Second Time Zone, Hour, Minute, Second, Tachymeter |
| Item Weight | 184 g |

Image: A visual guide illustrating various watch case diameters, ranging from 14-16mm up to 50-54mm, with a ruler for scale. This helps in understanding the 46mm case size of the T3B901 in context.
Warranty and Support
Your TIMEX TX T3B901 watch is covered by a manufacturer's warranty. The specific terms and duration of the warranty are typically provided with your purchase documentation. For warranty claims or technical support, please contact the seller of record or an authorized TIMEX service center. Retain your proof of purchase for warranty validation.
For further assistance, you may visit the official TIMEX website or contact their customer service department. Do not attempt to repair the watch yourself, as this may void the warranty.





