Introduction
This manual provides essential instructions for the safe and effective use of your Syofeetked 10-12V AC-DC Adaptor. This power supply is designed to provide reliable power to compatible electronic devices, specifically the Yamaha PSR-215 Portasound Electronic Piano Keyboard. Please read this manual thoroughly before use and retain it for future reference.
Safety Information
To ensure safe operation and prevent damage, please observe the following safety precautions:
- Indoor Use Only: This adapter is designed for indoor use in dry locations. Do not expose it to water, moisture, or high humidity.
- Correct Voltage: Ensure the wall outlet voltage matches the adapter's input voltage range (AC 100V - 240V).
- Proper Connection: Connect the adapter securely to your device before plugging it into a power outlet.
- Avoid Overloading: Do not connect the adapter to devices that exceed its specified power output.
- Inspect for Damage: Regularly inspect the adapter, cord, and plug for any signs of damage. Do not use if damaged.
- Ventilation: Ensure adequate ventilation around the adapter during use to prevent overheating.
- Children and Pets: Keep the adapter out of reach of children and pets.
Setup
Follow these steps to set up your Syofeetked AC-DC Adaptor:
- Unpack the Adaptor: Carefully remove the adapter from its packaging.
- Identify Connectors: Locate the DC barrel connector on the adapter cable and the AC prongs on the adapter body.
- Connect to Device: Insert the DC barrel connector firmly into the power input jack of your Yamaha PSR-215 Portasound Electronic Piano Keyboard. Ensure a snug fit.
- Plug into Wall Outlet: Insert the AC prongs of the adapter into a standard wall power outlet.

Image: The Syofeetked AC-DC Adaptor showing the DC barrel connector end, which connects to your electronic device.

Image: The Syofeetked AC-DC Adaptor showing the AC prongs, which plug into a wall outlet.
Operating
Once the adapter is correctly connected to your Yamaha PSR-215 keyboard and plugged into a live wall outlet, your device should receive power. The adapter may feature a small indicator light (often red) to confirm it is receiving power from the wall outlet. Refer to your Yamaha PSR-215 manual for specific instructions on powering on your keyboard.
Maintenance
Proper maintenance ensures the longevity and safe operation of your adapter:
- Cleaning: Disconnect the adapter from the power outlet and your device before cleaning. Use a soft, dry cloth to wipe the surface. Do not use liquid cleaners or solvents.
- 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.
- Cable Inspection: Periodically check the power cord for any cuts, fraying, or kinks. If any damage is observed, discontinue use immediately and replace the adapter.
Troubleshooting
If you encounter issues with your adapter, refer to the following common problems and solutions:
- Device Not Powering On:
- Ensure the adapter's DC barrel connector is fully inserted into the device's power jack.
- Verify the AC prongs are securely plugged into a functional wall outlet. Test the outlet with another device.
- Check if the adapter's indicator light (if present) is illuminated, indicating it is receiving power.
- Confirm that your Yamaha PSR-215 keyboard is switched on.
- Unusual Noise or Smell:
- Immediately disconnect the adapter from both the wall outlet and your device.
- Do not attempt to use the adapter again. Contact customer support for assistance.
Specifications
| Brand | Syofeetked |
| Model Number | HM-21 |
| Input Voltage Range | AC 100V - 240V |
| Output Voltage | 10-12V DC (as per product title) |
| Connector Type | DC Barrel Connector (compatible with Yamaha PSR-215) |
| Safety Features | Over-voltage protection, over-current protection, short-circuit protection |
Warranty and Support
Your Syofeetked AC-DC Adaptor comes with a 12 Months Warranty and a 30 Days Money Back Guarantee. We also provide Lifetime Support Customer Service. For any questions, concerns, or warranty claims, please contact Syofeetked customer service through your purchase platform or the contact information provided with your product.





