Introduction
This manual provides comprehensive instructions for the installation, operation, maintenance, and troubleshooting of the Dahao E866 Series Electronic Control Main Board, including models E866E and E866E-1305. This main board is a critical component for computer embroidery machines, facilitating precise control over embroidery processes. Please read this manual thoroughly before attempting any installation or operation.

Setup and Installation
Proper installation of the E866 main board is crucial for the correct functioning of your embroidery machine. This board is designed for industrial sewing machines only.
Pre-Installation Steps
- Verify Machine Compatibility: Before ordering, ensure the main board's part number matches your machine's existing board. If unsure, contact customer service with photos of your machine (operation panel, motor front, barcode, machine model, electric cabinet front, back interface) for confirmation.
- Provide Version Number: After placing an order, it is mandatory to provide the version number of your machine's original E866 motherboard. This allows the technical department to copy the corresponding program to the new board. Failure to provide the correct version number will result in an unusable board. Refer to the video below for guidance on locating your machine's version number.
Installation Procedure
- Power Off: Ensure the embroidery machine is completely powered off and disconnected from the main power supply before beginning installation.
- Access Main Board: Carefully open the machine's control cabinet to access the existing main board.
- Disconnect Old Board: Disconnect all cables and connectors from the old main board, noting their positions for re-connection. Take photos if necessary.
- Remove Old Board: Unscrew and remove the old main board from its mounting.
- Install New Board: Place the new E866 main board into position and secure it with screws.
- Connect Cables: Reconnect all cables and connectors to the new main board, ensuring they are firmly seated in their correct ports.
- Close Cabinet: Securely close the machine's control cabinet.
- Power On: Reconnect the machine to the power supply and power it on.

Operation
The Dahao E866 main board controls the embroidery process, including needle color changes. A significant update in newer versions is the transition to USB for pattern transfer.
Pattern Transfer via USB
Modern E866 main boards utilize USB for transferring embroidery patterns, replacing older disk-based methods. The chips responsible for pattern handling on older boards are now integrated into a small circuit board located in the upper right corner, accessible via USB.

To transfer patterns:
- Prepare your embroidery pattern files on a USB drive.
- Insert the USB drive into the designated USB port on the main board (refer to Figure 3).
- Follow your embroidery machine's interface instructions to import the pattern from the USB drive.
Needle Color Change Control
The DAHAO system provides precise control over needle color changes, a key feature for multi-color embroidery designs. Consult your machine's specific operational manual for detailed instructions on programming and executing color changes.
Maintenance
To ensure the longevity and optimal performance of your E866 main board, follow these maintenance guidelines:
- Regular Cleaning: Periodically inspect the main board for dust accumulation. Use compressed air or a soft, dry brush to gently remove dust. Ensure the machine is powered off and disconnected before cleaning.
- Environmental Control: Keep the operating environment clean, dry, and free from excessive humidity or extreme temperatures. Electronic components are sensitive to moisture and heat.
- Handle with Care: When handling the main board, avoid touching the electronic components directly. Always hold it by the edges to prevent static discharge or damage.
- Inspect Connections: Regularly check all cable connections to the main board to ensure they are secure and free from corrosion.

Troubleshooting
If you encounter issues with your E866 main board, consider the following troubleshooting steps:
- Incorrect Part Number: Ensure the installed main board's part number precisely matches your machine's requirements. Incompatible part numbers will prevent the board from functioning correctly.
- Version Number Mismatch: A common issue is an incorrect program version loaded onto the main board. Verify that the version number provided during purchase matches your machine's original board. If there's a mismatch, the board will not operate.
- Loose Connections: Check all cables and connectors for secure attachment to the main board and other machine components. Loose connections can cause intermittent or complete failure.
- Power Supply Issues: Confirm that the machine is receiving stable power and that the power supply unit is functioning correctly.
- USB Pattern Transfer Failure: If patterns are not transferring, ensure the USB drive is formatted correctly and the files are compatible. Check the USB port for any physical damage.
- Contact Customer Service: If basic troubleshooting does not resolve the issue, contact customer service. Be prepared to provide detailed information about your machine, the problem encountered, and any steps you have already taken. Providing photos of your machine and the main board can assist in diagnosis.
Specifications
| Feature | Specification |
|---|---|
| Type | Sewing Machine Parts |
| Use | Embroidery |
| Material | Plastic |
| Origin | Mainland China |
| Needle Color Change Control | DAHAO |
| Technology | High quality (Japanese technology) |
| Package Length | 10 cm |
| Package Width | 10 cm |
| Package Height | 5 cm |
| Package Weight | 1.45 kg |

Warranty and Support
All products are customized and undergo testing by the technical department before shipping to ensure quality. Due to the specialized nature of these products, all sales are final. Returns, refunds, or disputes based on 'no reason' are not accepted.
Customer Support
For any questions or concerns regarding product compatibility, installation, or troubleshooting, please contact customer service before making a purchase or attempting installation. Our team is committed to providing the best customer service and support for genuine product quality.
Important Notes
- These products are specifically for industrial sewing machines. They are not compatible with other machine types.
- Some parts may exhibit minor cosmetic defects (e.g., dust, oxidation) due to storage, but these do not affect normal functionality.
User Tips
- Always double-check your machine's model and the main board's part number for compatibility before purchase to avoid issues.
- When transferring patterns, ensure your USB drive is properly formatted and the files are compatible with the embroidery machine's software.
- Handle the main board with anti-static precautions to prevent damage to sensitive electronic components.
- Keep the machine's environment clean and stable to protect electronic components from dust and humidity.





