1. Introduction
This manual provides essential instructions for the safe and effective use of your Kircuit AC/DC Adapter. This power supply is designed to provide reliable power to compatible electronic keyboards, specifically the Meike MK-931 and MK-939 models. Please read this manual thoroughly before use and retain it for future reference.
2. Product Overview
The Kircuit AC/DC Adapter is a high-quality power solution featuring robust design and safety mechanisms.
2.1 Key Features
- Universal Input: Supports 100V-240V AC input, suitable for various regions.
- Safety Protections: Built-in dynamic IC, charger IC, and power fuse for rapid charging and protection against overcharge, short circuit, excess voltage, over temperature, and overcurrent.
- Durable Construction: Features a power cable made of high-quality materials with thick insulation and abrasion resistance.
- Secure Connection: Plugs are designed for a stable and secure connection, capable of handling electrical loads without overheating.

Image: Illustration of the adapter's durable cable design, highlighting high-quality materials and thick insulation for protection against wear and external factors.

Image: Comparison diagram showing the secure and stable design of the Kircuit adapter's plug versus less robust alternatives.
2.2 Package Contents
- 1 x Kircuit AC/DC Adapter
3. Setup Instructions
Follow these steps to properly connect your Kircuit AC/DC Adapter to your electronic keyboard.
- Verify Compatibility: Ensure your electronic keyboard is a Meike MK-931 or MK-939 model. This adapter is specifically designed for these models.
- Connect to Keyboard: Locate the power input port on your electronic keyboard. Insert the barrel connector of the Kircuit AC/DC Adapter firmly into this port.
- Connect to Power Outlet: Plug the AC prongs of the adapter into a standard wall power outlet (100V-240V AC).
- Power On: Once connected, you can power on your electronic keyboard.

Image: The Kircuit AC/DC Adapter showing the main unit and the connected power cord with its barrel connector.

Image: The Kircuit AC/DC Adapter displaying its 6.5 ft cord length, indicating ample reach for power connections.
4. Operating Instructions
The Kircuit AC/DC Adapter operates automatically once connected. No user intervention is required for its basic function.
- Ensure the adapter is securely plugged into both the keyboard and the wall outlet.
- The adapter will supply continuous power to your keyboard as long as it is connected to a live power source.
- To disconnect, always unplug the adapter from the wall outlet first, then from the keyboard.
5. Maintenance and Care
Proper care ensures the longevity and safe operation of your adapter.
- Cleaning: Disconnect the adapter from all power sources before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use liquid cleaners or solvents.
- Storage: Store the adapter in a cool, dry place away from direct sunlight and extreme temperatures when not in use. Avoid tightly coiling the cable to prevent damage.
- Inspection: Periodically inspect the adapter and cable for any signs of damage, such as frayed wires, bent prongs, or cracks in the casing. Discontinue use if damage is observed.
6. Troubleshooting
If you encounter issues with your Kircuit AC/DC Adapter, refer to the following common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Keyboard not powering on. | Adapter not properly connected. No power from outlet. Keyboard issue. | Ensure adapter is fully plugged into both keyboard and wall outlet. Test the wall outlet with another device. Check keyboard's power switch. |
| Adapter feels warm. | Normal operation. Overload or poor ventilation. | A slight warmth is normal. If it's excessively hot, disconnect immediately. Ensure adequate ventilation around the adapter. Verify keyboard power requirements match adapter output. |
| Adapter or cable is damaged. | Physical damage. | Discontinue use immediately. Do not attempt to repair. Contact customer support for replacement. |
7. Specifications
Technical details for the Kircuit AC/DC Adapter.
- Input: 100V-240V AC, 50/60Hz, 0.3A
- Output: Compatible with Meike MK-931 and MK-939 Electronic Keyboards
- Connector Type: Barrel connector
- Cord Length: Approximately 6.5 feet
- Weight: 8 ounces
- Special Features: Portable, Travel-friendly
8. Safety Information
Adhere to these safety guidelines to prevent injury or damage to the product.
- Do not expose the adapter to water, moisture, or extreme temperatures.
- Do not disassemble or attempt to repair the adapter. Refer servicing to qualified personnel.
- Avoid placing heavy objects on the power cord.
- Ensure the adapter is used in a well-ventilated area.
- Unplug the adapter during lightning storms or when unused for extended periods.
- Keep out of reach of children.

Image: Diagram highlighting the adapter's built-in safety features, including protection against short circuits, excess voltage, over temperature, and overcurrent.
9. Warranty and Support
For warranty information or technical support, please refer to the product packaging or contact Kircuit customer service directly. Details for contacting support are typically provided with your purchase or on the manufacturer's official website.