1. Introduction
This manual provides essential information for the installation, operation, and maintenance of the Sunon SL28 series quartz watch movements. These movements are designed as reliable replacements for various watch models, including alternatives to the 2115-20z movement.
The SL28 series movements are 100% brand new and high quality, featuring a 3-hand display with day/date or date-only functions and a sweep second hand.
2. Specifications
| Feature | Specification |
|---|---|
| Movement Type | Quartz |
| Diameter | Φ23.70mm |
| Height | 4.15mm |
| Accuracy | ±60 seconds per month |
| Functions | 3 Hands (Hour, Minute, Sweep Second), Day/Date or Date only |
| Recommended Use | Accessories replacement for watches |
3. Available Models
The Sunon SL28 series includes several variations to suit different watch designs:
- SL28-6: Features 3 hands with Day and Date display.
- SL28D-3: Features 3 hands with Date display only.
- SL28DD: Features 3 hands with Date display only (may have minor aesthetic differences from SL28D-3).
4. Installation and Setup
Replacing a watch movement requires precision and appropriate tools. If you are not experienced with watch repair, it is recommended to seek assistance from a professional watchmaker.
4.1 Tools Required
- Watch case opener
- Movement holder
- Tweezers
- Screwdrivers (precision set)
- Hand removers
- Dust blower
- Finger cots or gloves
4.2 Installation Steps
- Prepare Workspace: Ensure a clean, dust-free, and well-lit area. Wear finger cots or gloves to prevent oils and dust from contaminating the movement.
- Open Watch Case: Carefully open the watch case using the appropriate case opener.
- Remove Crown and Stem: Locate the stem release button or lever on the old movement. Gently press it while pulling the crown and stem out.
- Remove Old Movement: Unscrew any movement clamps or screws holding the old movement in place. Carefully lift the old movement out of the watch case.
- Transfer Components (if necessary): If the new movement does not come with a dial or hands, carefully transfer them from the old movement using hand removers and tweezers. Ensure hands are aligned correctly (e.g., 12 o'clock position for all hands).
- Insert New Movement: Place the new Sunon SL28 series movement into the watch case. Ensure it sits correctly and secure it with movement clamps/screws.
- Insert Crown and Stem: Gently re-insert the crown and stem into the new movement. You should feel a slight click as it engages.
- Test Functions: Before closing the case, test the movement's functions:
- Time Setting: Pull the crown to the furthest position and adjust the hands.
- Date Setting: Pull the crown to the first click position and rotate to change the date.
- Day Setting (for SL28-6): If applicable, rotate the crown in the date-setting position or advance the time past midnight to change the day.
- Close Watch Case: Once all functions are verified, carefully close and secure the watch case.
5. Operating Instructions
The Sunon SL28 series movements operate similarly to standard quartz watch movements.
5.1 Setting Time
- Pull the crown out to the furthest position (usually the second click).
- Rotate the crown clockwise or counter-clockwise to set the hour and minute hands to the desired time.
- Push the crown back into the normal operating position.
5.2 Setting Date
- Pull the crown out to the first click position.
- Rotate the crown (direction may vary, typically clockwise) to adjust the date.
- For movements with a day function (SL28-6), rotating the crown in the opposite direction in this position may adjust the day.
- Once the date (and day, if applicable) is set, push the crown back into the normal operating position.
Important Note:
- Avoid setting the date or day between 9 PM and 3 AM, as this is when the movement's date change mechanism is engaged, and manual adjustment can cause damage.
- Always set the time forward to avoid potential issues with the date change mechanism.
6. Maintenance
Proper maintenance ensures the longevity and accuracy of your Sunon SL28 series movement.
6.1 Battery Replacement
The movement is powered by a standard watch battery (type not specified, typically SR626SW or similar for quartz movements). When the watch stops or runs intermittently, the battery likely needs replacement.
- Open the watch case and carefully remove the movement as described in the installation section.
- Locate the battery compartment on the back of the movement.
- Gently unclip or unscrew the battery retainer.
- Remove the old battery and insert a new, compatible battery with the correct polarity (+ side up).
- Secure the battery retainer and reassemble the watch.
6.2 General Care
- Avoid Shocks: While robust, excessive shocks can damage the delicate internal components.
- Temperature Extremes: Protect the watch from extreme temperatures, which can affect battery life and movement accuracy.
- Magnetic Fields: Keep the watch away from strong magnetic fields, as they can temporarily or permanently affect quartz accuracy.
- Water Resistance: The movement itself is not inherently water-resistant. The watch case provides water resistance. Ensure the case is properly sealed after any repair or battery change.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Watch stops or runs intermittently | Dead or low battery | Replace the battery (see Section 6.1). |
| Watch runs too fast or too slow | Exposure to strong magnetic fields | Demagnetize the watch or consult a professional. |
| Date/Day not changing correctly | Incorrect setting time (9 PM - 3 AM) or damaged mechanism | Avoid setting date/day during restricted hours. If issue persists, professional repair may be needed. |
| Hands are loose or misaligned | Improper installation or shock | Re-seat the hands carefully using appropriate tools, or seek professional help. |
| Crown does not engage properly | Stem not fully inserted or damaged | Ensure the stem is fully inserted and clicks into place. Check for damage to the stem or movement. |
8. User Tips
- When replacing the movement, always handle it by the edges or use specialized tools to avoid touching the delicate components.
- Ensure the correct battery type is used for optimal performance and to prevent damage.
- If you are unsure about any step of the installation or repair process, it is always best to consult a qualified watch repair technician.
9. Warranty and Support
For any issues or questions regarding your Sunon SL28 series quartz movement, please contact the seller or manufacturer directly. Keep your purchase records for warranty claims.
This product is intended for replacement and repair purposes. Professional installation is recommended.
