1. Product Overview
The YIHUA 959D-II hot air soldering station is designed for precise soldering and desoldering of Surface Mount Device (SMD) components. It features advanced temperature control and user-friendly functions to enhance efficiency and component safety during rework tasks.
- Adjustable Temperature: Temperature range from 100°C to 480°C.
- Adjustable Airflow: Air volume is adjustable up to 120 liters per minute (L/Min).
- PID Temperature Control: Integrated PID program ensures stable and accurate temperature output, protecting sensitive components.
- Automatic Start/Stop: The hot air gun automatically cools to 100°C and enters standby mode when placed in its holder, extending the heating element's lifespan.
- Quick-Change Nozzles: Interchangeable hot air nozzles can be quickly replaced without tools.
- Versatile Application: Suitable for various SMD components including QFP, DIP, PLCC, BGA, and for heat shrink tubing applications.

2. Safety Instructions
To ensure safe operation and prevent damage to the unit or injury, please observe the following safety precautions:
- Always operate the soldering station in a well-ventilated area to avoid inhaling fumes.
- Wear appropriate personal protective equipment (PPE), including safety glasses, to protect against splashes or flying debris.
- Do not touch the hot air gun nozzle or heated components directly. Allow them to cool before handling.
- Ensure the power cord is in good condition and free from damage. Do not use if the cord is frayed or cut.
- Keep the unit away from flammable materials, liquids, and gases.
- Unplug the unit from the power outlet when not in use, during maintenance, or when changing accessories.
- Do not immerse the unit or its components in water or other liquids.
- Keep out of reach of children.
3. Setup
Follow these steps to set up your YIHUA 959D-II hot air soldering station:
- Unpack the Unit: Carefully remove all components from the packaging. Verify that all parts are present: the main station, hot air gun, hot air gun holder, and various nozzles.
- Connect the Hot Air Gun: Plug the hot air gun cable into the designated port on the front panel of the main station. Ensure a secure connection.
- Install the Nozzle Rack: Attach the nozzle rack to the side of the main station using the provided screws. This rack provides convenient storage for unused nozzles.

- Power Connection: Connect the power cord to the main station and then to a suitable 230V AC power outlet (EU plug).
4. Operating Instructions
4.1 Power On/Off
- To power on, flip the main power switch located on the front panel. The LCD display will illuminate.
- To power off, flip the main power switch back to the off position. The unit will cool down before completely shutting off.
4.2 Adjusting Temperature and Airflow
Use the control knobs and buttons on the front panel to set your desired temperature and airflow.

- Temperature Adjustment: Use the '+' and '-' buttons next to the temperature display to increase or decrease the temperature. The range is 100°C to 480°C.
- Airflow Adjustment: Rotate the 'MIN/MAX' knob to adjust the airflow volume. The maximum airflow is 120 L/Min.
4.3 Changing Nozzles
The YIHUA 959D-II features quick-change nozzles for different applications.
- Ensure the hot air gun is cool before changing nozzles to prevent burns.
- Gently pull the current nozzle off the hot air gun.
- Select the desired nozzle size and push it firmly onto the hot air gun until it is securely seated.

4.4 Automatic Standby Function
When the hot air gun is placed into its holder, the unit will automatically detect this and initiate a cooling process. The temperature will drop to 100°C, and the unit will enter a temporary shutdown state. This feature conserves energy and prolongs the life of the heating element. When the hot air gun is lifted from the holder, it will automatically resume operation at the last set temperature and airflow.

5. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your soldering station.
- Cleaning Nozzles: Periodically clean the hot air nozzles to remove any flux residue or debris that may obstruct airflow. Use a soft brush or non-abrasive cleaning solution.
- Unit Cleaning: Wipe the exterior of the main station and hot air gun with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure the unit is unplugged before cleaning.
- Cable Inspection: Regularly inspect all cables for any signs of wear, cuts, or damage. Replace damaged cables immediately.
- Storage: When not in use, store the soldering station in a dry, dust-free environment.
6. Troubleshooting
If you encounter issues with your YIHUA 959D-II, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power/Display off | Power cord unplugged; Power switch off; Blown fuse. | Check power cord connection; Ensure power switch is ON; Check and replace fuse if necessary (refer to service manual). |
| Hot air gun not heating | Heating element failure; Loose connection; Incorrect temperature setting. | Ensure hot air gun is securely connected; Verify temperature setting is above 100°C; Contact support if heating element is suspected. |
| No airflow or weak airflow | Air pump failure; Airflow knob set to minimum; Obstructed nozzle. | Adjust airflow knob; Clean or replace nozzle; Contact support if air pump is suspected. |
| Temperature unstable/fluctuating | Sensor issue; PID calibration needed; Environmental factors. | Ensure proper nozzle attachment; Operate in a stable environment; Contact support for sensor or calibration issues. |
If the problem persists after attempting these solutions, please contact YIHUA customer support.
7. Specifications
Key technical specifications for the YIHUA 959D-II Hot Air Soldering Station:
- Model: YIHUA 959D-II
- Brand: YIHUA
- Display Type: LCD
- Temperature Range: 100°C to 480°C
- Temperature Stability: PID controlled
- Airflow Volume: Up to 120 L/Min (Max)
- Input Voltage: 230V AC (EU Plug)
- Number of Channels: 1
- Country of Origin: China
8. Warranty and Support
YIHUA provides comprehensive support for your product:
- Warranty: The YIHUA 959D-II comes with a 12-month technical coverage for the EU.
- Technical Support: Professional technical support is available 24/7 via Amazon. For inquiries or assistance, please contact the YIHUA EU Official Store through the Amazon platform.
- Online Resources: Visit the official YIHUA store on Amazon for additional product information and resources: YIHUA Amazon Store.