1. Product Overview
This Onerbl AC-DC adapter is designed to provide reliable power for various electronic music devices. It converts standard AC power from electrical outlets into the DC power required by your compatible device, ensuring stable operation or battery charging. Manufactured with high-quality materials, this adapter is a suitable replacement or travel solution.

Figure 1: The Onerbl AC-DC Adapter, showing the main unit and the connected power cord with a barrel connector.
Compatible Devices:
- Korg DDM-110 Super Drums Programmable Digital Drum Machine
- Korg DDM-220 Super Percussion Programmable Digital Drum Machine
- Korg DDD-5 Dynamic Digital Drum Programmable Digital Drum
- Korg microKORG 141228 N222 Micro KORG Synthesizer
- KORG Model VFK-980B1, Part No. KAC-303
2. Setup Instructions
2.1 Unpacking
Carefully remove the AC-DC adapter from its packaging. Ensure all components are present and undamaged.
2.2 Connecting the Adapter
- Identify the power input port on your compatible Korg device. This is typically a circular port designed for a barrel connector.
- Insert the barrel connector of the Onerbl AC-DC adapter firmly into the power input port of your device. Ensure a secure connection.
- Plug the AC plug of the adapter into a standard 120V AC electrical outlet. Ensure the outlet is easily accessible and not overloaded.
- Once connected, your device should receive power. Refer to your device's manual for specific power-on procedures.

Figure 2: The AC-DC adapter connected to a compatible electronic device, demonstrating a typical setup.
3. Operating Instructions
3.1 Powering On
After connecting the adapter as described in the Setup section, your device should be ready to power on. Use the power switch on your Korg device to turn it on. The adapter provides continuous power as long as it is plugged into a live electrical outlet and connected to the device.
3.2 Usage Guidelines
- Ensure the adapter is used with compatible devices only. Refer to the "Compatible Devices" list in Section 1.
- Do not expose the adapter to water, excessive moisture, or extreme temperatures.
- Avoid placing the adapter in poorly ventilated areas during operation to prevent overheating.
- Always unplug the adapter from the wall outlet when not in use for extended periods or during electrical storms.
4. Maintenance and Care
- Cleaning: Disconnect the adapter from both the power outlet and your device before cleaning. Use a soft, dry cloth to wipe the surface. Do not use liquid cleaners or abrasive materials.
- Storage: When not in use, store the adapter in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid tightly coiling the cable to prevent damage.
- Cable Care: Do not bend, twist, or pull the cable excessively. Avoid placing heavy objects on the cable, which can cause internal damage.
- Safety: Do not attempt to open or repair the adapter. Refer all servicing to qualified personnel.
5. Troubleshooting
If you encounter issues with your AC-DC adapter, please refer to the table below for common problems and their solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on. | Adapter not properly connected to device or outlet. | Ensure the barrel connector is fully inserted into the device and the AC plug is securely in the wall outlet. Try a different outlet. |
| Device powers on intermittently. | Loose connection or faulty outlet. | Check all connections for looseness. Test the outlet with another device. |
| Adapter feels hot. | Normal operation, or poor ventilation. | A slight warmth is normal. Ensure the adapter is in a well-ventilated area and not covered. If excessively hot, disconnect immediately and contact support. |
| Device not compatible. | Incorrect voltage or connector type. | Verify your device's power requirements match the adapter's specifications (9V DC, 0.7A, barrel connector). |
6. Technical Specifications
| Feature | Detail |
|---|---|
| Brand | onerbl |
| Input Voltage | 100-240V AC, 50/60Hz |
| Output Voltage | 9V DC |
| Output Current | 0.7A (700mA) |
| Connector Type | Barrel Connector |
| Special Feature | Short Circuit Protection |
| Color | Black |
| Cable Length | Approx. 76 inches (193 cm) |
| Dimensions (Adapter Body) | Approx. 2.6 inch (L) x 1.6 inch (W) x 1.2 inch (H) |

Figure 3: Detailed dimensions of the adapter unit and the cable length.

Figure 4: Front and side views of the AC-DC adapter, showing the input/output labels and design.
7. Warranty and Support
For information regarding warranty coverage, returns, or technical support for your Onerbl AC-DC adapter, please refer to the seller's policy or contact the manufacturer directly. Specific warranty details are typically provided at the point of purchase or on the manufacturer's official website.
For general inquiries, you may also visit the onerbl brand page on Amazon.