1. Product Overview
The SUNON SP28D-3 is a high-quality quartz watch movement featuring a sweep second hand and a date display. Designed for watch repair and replacement, this movement offers reliable timekeeping and functionality for various watch models.
Figure 1: Front view of the SUNON SP28D-3 movement, showing the date wheel and winding stem.
2. Specifications
| Feature | Detail |
|---|---|
| Model | SP28D-3 |
| Type | Quartz Movement |
| Item Type | Repair Tools & Kits, Accessories replacement |
| Size (Diameter) | Φ23.70mm |
| Height | 4.15mm |
| Accuracy | ±60 seconds per month |
| Function | 3 Hands (Hour, Minute, Sweep Second), Date Display |
| High-concerned chemical | None |
| Origin | Mainland China |
Figure 2: Typical watch face layout compatible with the SP28D-3 movement.
3. Setup and Installation
This movement is intended for professional watch repair and assembly. Proper tools and expertise are required for installation.
- Preparation: Ensure your workspace is clean, dust-free, and well-lit. Have all necessary watchmaking tools ready, including tweezers, hand-setting tools, and a movement holder.
- Crown and Stem Installation: Carefully insert the winding stem with the crown attached into the movement's stem tube. Ensure it clicks securely into place.
- Hand Setting: With the movement secured in a holder, carefully attach the hour, minute, and sweep second hands. Ensure they are parallel and do not touch each other or the dial.
- Dial and Casing: Mount the dial onto the movement. Then, carefully place the assembled movement and dial into the watch case, securing it with movement rings or screws as appropriate for your watch case design.
- Case Back: Securely close the watch case back.
Figure 3: Rear view of the SUNON SP28D-3 movement, indicating the battery placement area.
4. Operating Instructions
Once installed, the SP28D-3 movement operates like a standard quartz watch with date function.
- Setting the Time: Pull the crown out to the furthest position (typically position 2 or 3, depending on the watch case). Rotate the crown to move the hands and set the correct time. Push the crown back in to start the movement.
- Setting the Date: Pull the crown out to the first position (typically position 1 or 2). Rotate the crown to adjust the date. Avoid setting the date between 9 PM and 3 AM, as this can interfere with the automatic date change mechanism. Push the crown back in when finished.
Video 1: Demonstration of the SUNON SP28D-3 movement's sweep second hand and date change function.
5. Maintenance
- Battery Replacement: The movement uses a standard watch battery. When the watch stops or runs erratically, it's likely time for a battery replacement. This should be performed by a qualified watch technician to avoid damaging the movement.
- Cleaning: Keep the watch case clean and dry. Avoid exposing the watch to extreme temperatures, strong magnetic fields, or harsh chemicals.
- Water Resistance: The water resistance of the watch depends on the watch case, not the movement itself. Ensure the watch case is properly sealed after any maintenance.
6. Troubleshooting
- Watch Not Running: Check if the crown is pushed all the way in. If it is, the battery may need replacement.
- Incorrect Time/Date: Ensure the time and date are set correctly as per the operating instructions. If the issue persists, the hands might be loose or the movement may require inspection.
- Compatibility Issues: This movement is designed as a replacement part. Ensure it is compatible with your specific watch case and hands before installation. If you are unsure about compatibility (e.g., with a Casio Marlin Duro), consult a professional watchmaker or refer to detailed watch specifications.
7. User Tips
- Always handle the movement with care, using appropriate tools to prevent damage to delicate components.
- When replacing a movement, ensure the new movement's dimensions and stem height match the original for proper fit and function within the watch case.
- For optimal performance, avoid exposing the watch to sudden shocks or vibrations.
8. Warranty and Support
For warranty information or technical support regarding the SUNON SP28D-3 movement, please contact the seller or manufacturer directly. Keep your purchase records for any warranty claims.
