1. Вступ
The Futaba S-U400 Digital Standard Servo is engineered for precision and reliability in various remote-controlled applications, particularly for airplanes. This high-voltage, S.Bus2 capable servo features durable plastic gears, offering a balance of performance and cost-effectiveness. This manual provides essential information for the proper installation, operation, and maintenance of your S-U400 servo to ensure optimal performance and longevity.
2. Заходи безпеки
- Always ensure the servo is connected to the correct voltage supply as specified in the product specifications. Incorrect voltage can cause damage to the servo or other components.
- Avoid applying excessive force to the servo horn or output shaft, as this can strip gears or damage internal mechanisms.
- Keep the servo away from water, dust, and corrosive materials unless explicitly stated as waterproof.
- Ensure all connections are secure to prevent intermittent operation or power loss.
- Do not attempt to disassemble or modify the servo, as this will void the warranty and may lead to malfunction.
3. Вміст упаковки
Перевірте наявність усіх предметів у вашій упаковці:
- Futaba S-U400 Digital Standard Servo
- Accessory Pack (includes various servo horns and mounting screws)

Image of the Futaba S-U400 Standard Servo, showing its compact design and wiring.
4. Технічні характеристики
| Особливість | опис |
|---|---|
| Модель | S-U400 (FUT011023333) |
| Тип | Digital Standard Servo |
| томtage Сумісність | Високий волtage (HV) |
| S.Bus2 Compatibility | так |
| Матеріал спорядження | пластик |
| Швидкість @ 6.6 В | 0.14 sec/60 degrees |
| Швидкість @ 7.4 В | 0.13 sec/60 degrees |
| Крутний момент @ 6.6 В | 98.6 oz/in |
| Крутний момент @ 7.4 В | 109.7 oz/in |
| Розміри (ДxШxВ) | 40 x 20 x 36.1 мм (1.6 x 0.8 x 1.5 дюймів) |
| вага | 1.38 унцій |
| Сплайн | 6mm/25T |
| Тип двигуна | 3-Pole Cored |
5. Налаштування
5.1 Mounting the Servo
- Identify a suitable mounting location in your RC model that provides adequate clearance for servo movement and linkage.
- Use the provided mounting screws to secure the servo firmly to the servo mount. Avoid overtightening, which can crack the servo case.
- Attach the appropriate servo horn from the accessory pack to the servo output shaft. Ensure it is centered before securing it with the small screw.
5.2 Електричне підключення
- Connect the servo's three-wire cable to the corresponding channel on your receiver. The standard color code is typically: Коричневий (Ground), Червоний (Positive Voltagд), Orange/Yellow/White (Signal).
- Ensure your power supply (battery/BEC) provides the correct high voltage (6.6V to 7.4V) for optimal servo performance.
- If using S.Bus2, connect the servo to an S.Bus2 port on your compatible receiver or S.Bus hub. Refer to your receiver's manual for specific S.Bus2 setup instructions.
6. Операційна
Once the servo is correctly mounted and connected, power on your RC system (transmitter first, then receiver/model). The servo should initialize and move to its neutral position. Test the servo's movement by operating the corresponding control on your transmitter. Observe for smooth and consistent motion throughout its range.
- Центрування: Ensure the servo horn is perfectly centered when the transmitter stick is at neutral. Adjust the trim settings on your transmitter if necessary.
- Коригування подорожі: Set the servo's travel limits (endpoints) on your transmitter to prevent over-travel, which can bind the linkage or damage the servo.
- напрямок: If the servo moves in the opposite direction to your control input, reverse the servo direction on your transmitter.
7. Технічне обслуговування
- Regularly inspect the servo for any signs of physical damage, loose screws, or worn gears.
- Keep the servo clean and free from dirt, dust, and debris. Use a soft, dry brush or cloth for cleaning.
- Check servo linkages for smooth movement and ensure they are not binding, which can put undue strain on the servo.
- Avoid exposing the servo to extreme temperatures or direct sunlight for prolonged periods.
8. Вирішення проблем
8.1 Servo Not Responding
- Check all electrical connections to ensure they are secure and correctly plugged into the receiver.
- Verify that the receiver and transmitter are powered on and properly bound.
- Confirm the battery has sufficient charge and is providing the correct voltage.
- Test the servo on a different receiver channel or with another known working servo to isolate the issue.
8.2 Erratic or Jerky Movement
- Inspect servo linkages for any binding or obstruction.
- Check for interference from other electronic components. Ensure proper spacing and shielding.
- Verify that the servo horn is securely attached and not slipping on the spline.
- Переконайтеся, що джерело живлення стабільне та не перевантажуєтьсяtage drops under load.
8.3 Servo Making Noise
- A slight buzzing sound is normal for digital servos. However, excessive noise may indicate binding in the linkage or damaged gears.
- Перевірте наявність будь-яких фізичних перешкод, що перешкоджають плавному руху.
- If the noise is accompanied by poor performance, inspect the gears for wear or damage.
9. Гарантія та підтримка
Futaba products are manufactured to high standards and undergo rigorous quality control. For warranty information, please refer to the official Futaba website or contact your local distributor. For technical support, please visit the Futaba support portal or consult your product retailer.
Примітка: Зберігайте чек про покупку як підтвердження покупки для гарантійних претензій.





