Introduction
This manual provides essential information for the proper installation, operation, maintenance, and troubleshooting of the SunStar SWF X-Y Motor Encoder. This component is designed for use with Korean computerized embroidery machines, specifically models utilizing the STMO1-000001 and SANYO 103H7823-0416 encoder types, including B-T901C and E-T901 series.
The X-Y Motor Encoder is a critical part of your embroidery machine's motion control system, ensuring precise movement of the embroidery frame for accurate stitch placement. Please read this manual thoroughly before attempting any installation or maintenance.
Product Overview

The X-Y Motor Encoder is an electronic sensor that converts the angular position or motion of the embroidery machine's X and Y axis motors into an analog or digital signal. This signal is then used by the machine's control system to determine the exact position and speed of the embroidery frame, ensuring precise pattern execution.
Safety Information
- Always disconnect power to the embroidery machine before installing, removing, or servicing any components.
- Wear appropriate personal protective equipment (PPE) if required by your workplace safety regulations.
- Only qualified technicians should perform installation and repair procedures.
- Avoid touching electronic components directly to prevent electrostatic discharge (ESD) damage.
- Ensure all connections are secure and correctly oriented before restoring power.
Installation
The X-Y Motor Encoder is a precision component. Incorrect installation can lead to machine malfunction or damage. It is highly recommended that installation be performed by a certified technician.
- Power Disconnection: Turn off the embroidery machine and unplug it from the power source.
- Access Motor Area: Carefully open the machine panels to access the X and Y axis motors and their existing encoders. Refer to your embroidery machine's specific service manual for panel removal instructions.
- Identify Encoder: Locate the X-Y motor encoder to be replaced. Note its orientation and connection points.
- Disconnect Old Encoder: Gently disconnect the wiring harness from the old encoder and unmount it from the motor assembly. Be careful not to damage the motor shaft or surrounding components.
- Install New Encoder: Mount the new SunStar SWF X-Y Motor Encoder (STMO1-000001 / SANYO 103H7823-0416) onto the motor assembly, ensuring it is securely fastened and correctly aligned.
- Connect Wiring: Connect the encoder's wiring harness to the corresponding port on the machine's control board or motor driver. Ensure all pins are correctly seated and the connector is locked.
- Secure Panels: Once the encoder is installed and connected, carefully re-secure any removed machine panels.
- Initial Power-Up: Plug the machine back into the power source and turn it on. Observe for any error messages or unusual behavior.
- Calibration/Testing: Perform the X-Y axis calibration procedure as outlined in your embroidery machine's main instruction manual to ensure the new encoder is functioning correctly and providing accurate positional feedback.
Operation
The X-Y Motor Encoder operates continuously as an integral part of your computerized embroidery machine's motion control system. It requires no direct user interaction during normal operation.
- The encoder provides real-time positional data to the machine's controller.
- This data is crucial for the precise movement of the embroidery frame, allowing for accurate stitching and pattern reproduction.
- Ensure the machine's software and firmware are up-to-date to optimize encoder performance.
Maintenance
Regular maintenance helps ensure the longevity and optimal performance of your X-Y Motor Encoder.
- Cleaning: Periodically inspect the encoder and its surrounding area for dust, lint, or debris. Use a soft, dry brush or compressed air to gently clean the components. Avoid using liquid cleaners directly on the encoder.
- Connection Check: Ensure all electrical connections to the encoder are secure and free from corrosion. Loose connections can lead to intermittent errors.
- Cable Inspection: Check the encoder cable for any signs of wear, fraying, or damage. Replace damaged cables immediately to prevent electrical issues.
- Environmental Conditions: Operate the embroidery machine in a clean, dry environment with stable temperature and humidity to protect sensitive electronic components.
Troubleshooting
If you experience issues with your embroidery machine's X-Y axis movement, the encoder may be a contributing factor. Always consult your machine's primary service manual for comprehensive troubleshooting steps.
| Symptom | Possible Cause | Action |
|---|---|---|
| Erratic or inaccurate X-Y movement | Loose encoder connection, dirty encoder sensor, faulty encoder. | Check and secure connections. Clean the encoder sensor. If issues persist, consider replacing the encoder. |
| No X-Y movement or axis error message | Disconnected encoder, completely failed encoder, motor driver issue. | Verify encoder cable is fully connected. Test the encoder with diagnostic tools if available. Consult a technician. |
| Machine fails to home X-Y axes | Encoder not providing correct feedback, homing sensor issue. | Check encoder functionality. Inspect homing sensors. Recalibrate X-Y axes. |
For complex issues, it is always recommended to contact a professional embroidery machine service technician.
Specifications
- Product Type: X-Y Motor Encoder for Industrial Sewing Machines (Embroidery)
- Brand: SunStar SWF
- Model Numbers: STMO1-000001, SANYO 103H7823-0416, B-T901C, E-T901
- Stitch Formation Compatibility: Lock Stitch machines
- Origin: Mainland China
- Package Dimensions (Approx.):
- Length: 30 cm
- Width: 5 cm
- Height: 5 cm
- Package Weight (Approx.): 0.1 kg
User Tips
- When replacing the encoder, take a photo of the existing wiring before disconnecting to ensure correct reassembly.
- Always handle the encoder by its edges or housing, avoiding contact with the circuit board or sensor components.
- After installation, run a test pattern on your embroidery machine to confirm smooth and accurate X-Y axis movement.
Warranty and Support
For warranty information and technical support, please contact the seller or your authorized SunStar SWF service center. Keep your purchase records handy when seeking support.





