YIHUA 948-I Desoldering Gun Soldering Iron 2-in-1 Digital Soldering Station User Manual

1. Introduction

The YIHUA 948-I is a versatile 2-in-1 digital soldering and desoldering rework station designed for precision electronics work. It integrates a powerful desoldering gun with a vacuum suction pump and a high-performance soldering iron, offering efficient and clean removal and application of solder. This manual provides essential information for safe operation, setup, maintenance, and troubleshooting to ensure optimal performance and longevity of your device.

2. Safety Instructions

Always operate the unit in a well-ventilated area to avoid inhaling solder fumes.
The soldering iron and desoldering gun tips reach very high temperatures. Avoid direct contact with skin or flammable materials.
Always place the tools in their designated holders when not in use.
Ensure the power supply matches the unit's rated voltage (110-127V or 220-240V AC).
Do not use the unit near water or in damp conditions.
Unplug the unit from the power outlet before cleaning or maintenance.
Wear appropriate personal protective equipment, such as safety glasses, during operation.
Keep out of reach of children.

3. Package Contents

Please check the package contents upon receipt. If any items are missing or damaged, contact your supplier.

YIHUA 948-I Control Unit
Desoldering Gun with Vacuum Suction Pump
Soldering Iron
Soldering Iron Stand
Desoldering Gun Holder
Filter Tube (pre-installed in desoldering gun)
Cleaning Needles for Desoldering Nozzle
Multiple Desoldering Nozzles (0.8mm, 1.0mm, 1.8mm, 2.0mm)
Solder Wire
Cleaning Sponge/Steel Wool
Power Cord
User Manual

Figure 1: YIHUA 948-I Desoldering Station and included accessories.

4. Specifications

Feature	Specification
Brand Name	YIHUA
Model Number	948-I
Origin	Mainland China
Certification	CE, FCC
Voltage	110-127V AC / 220-240V AC
Rated Power	90W
Operating Ambient Temp.	0~40°C (32°F~104°F)
Display	LED
Soldering Iron Temperature Range	200-480°C (392°F-896°F)
Desoldering Gun Temperature Range	380-480°C (716°F-896°F)
Desoldering Gun Suction	≤ 0.05MPa
Tip to Ground Resistance	<2 ohms
Nozzle to Ground Resistance	<2 ohms
Control Unit Dimensions	L234W202H134mm
Function 1	Sleep Mode
Function 2	Auto-shutdown
Function 3	Temperature calibration

5. Setup

5.1 Connecting the Tools

Connect the desoldering gun's vacuum hose to the 'VACUUM' port on the control unit. Secure it by twisting the connector.
Connect the desoldering gun's electrical connector to the 'DESOLDERING' port.
Connect the soldering iron's electrical connector to the 'IRON' port.
Place the desoldering gun and soldering iron in their respective holders.

Video 1: Product overview and demonstration of connections and features.

5.2 Assembling the Desoldering Gun

The desoldering gun features an anti-clog design. To assemble or disassemble for cleaning:

Unscrew the front cap of the desoldering gun.
Carefully remove the spring, filter tube, and filter.
Insert the desired desoldering nozzle (0.8mm, 1.0mm, 1.8mm, 2.0mm) onto the heating element.
Reassemble the filter, filter tube, spring, and cap in reverse order.

Figure 2: Exploded view of the desoldering gun components for assembly.

5.3 Powering On

Connect the power cord to the control unit and a suitable power outlet. Flip the 'POWER' switch to the 'ON' position. The LED display will illuminate.

6. Operating Instructions

6.1 Tool Selection

Use the toggle switch on the control unit to select between 'SOLDERING' (for the soldering iron) or 'DESOLDERING' (for the desoldering gun). The 'VAC' position activates the vacuum pump for desoldering.

Figure 3: Toggle switch for selecting soldering or desoldering function.

6.2 Preheating (Desoldering Gun)

When the desoldering gun is selected, the display will show "Pht" indicating preheating. The vacuum pump will not activate until the preheating process is complete, which typically takes about 10 minutes. Wait for the display to show the set temperature and for the unit to beep before starting desoldering operations.

Figure 4: Display showing 'Pht' during desoldering gun preheating, indicating the vacuum pump is not yet active.

6.3 Temperature Control

Use the '+' and '-' buttons on the control unit to adjust the desired temperature for either the soldering iron or desoldering gun. The LED display will show the current temperature.

6.3.1 °C/°F Temperature Display Options

The unit supports both Celsius (°C) and Fahrenheit (°F) temperature displays. To switch between modes, press the designated button (often marked with a star or specific symbol, as shown in Figure 5) or refer to the specific instructions for your unit's button layout.

Figure 5: Temperature display options in Celsius and Fahrenheit, and buttons for adjustment and calibration.

6.3.2 Temperature Calibration

Temperature calibration ensures accurate temperature readings, which is crucial for optimal soldering and desoldering. Calibration is recommended in the following scenarios:

First-time use of a new soldering station.
After replacing the heating element or soldering tip.
Noticeable temperature deviation after long-term use.
Switching between different types of soldering tips.
Experiencing cold solder joints or difficulty melting solder.
When performing high-precision soldering tasks.
Large ambient temperature shifts (e.g., seasonal changes).

Calibration Steps:

Set the desired temperature on the station. Once the temperature stabilizes, use a soldering thermometer to measure the actual temperature of the soldering iron tip or desoldering nozzle.
Press and hold the '+' and '-' buttons simultaneously on the control unit. The display will show the current measured temperature.
Adjust the displayed temperature using the '+' and '-' buttons to match the reading from your soldering thermometer.
Release the buttons to save the calibrated temperature.

Figure 6: Three-step process for temperature calibration using a soldering thermometer.

6.4 Soldering Operation

Select the 'SOLDERING' function. Allow the soldering iron to reach the set temperature. Apply a small amount of solder to the tip to tin it. Then, apply the heated tip to the component lead and pad to be soldered, followed by applying solder to the joint. Remove the solder and then the iron once a good joint is formed.

Soldering iron and desoldering gun in use on a circuit board — Figure 7: Soldering iron (top) and desoldering gun (bottom) in operation on a circuit board, showing their respective temperature ranges.

6.5 Desoldering Operation

Select the 'DESOLDERING' function and ensure preheating is complete. Place the desoldering gun nozzle over the solder joint you wish to remove. Allow the solder to melt, then press the trigger on the desoldering gun to activate the vacuum pump and suck away the molten solder. Repeat if necessary until the pad is clean.

Step-by-step desoldering process: heating, melting, and vacuum suction — Figure 8: Step-by-step desoldering process: heating the original point, melting the solder, pressing the trigger to suck, resulting in clean desoldering.

6.6 Sleep Mode

The unit features a sleep mode to extend the lifespan of the heating element, save energy, and enhance safety. You can set the sleep time from 0 to 99 minutes. When the tool is inactive for the set duration, it will enter sleep mode, reducing the tip temperature.

Display showing 'SLP' for sleep mode and setting options — Figure 9: Display showing 'SLP' for sleep mode, indicating the unit is in a low-power state. Sleep time can be set from 0-99 minutes.

6.7 Automatic Shutdown Timer

For added safety, the unit includes an automatic shutdown timer, configurable from 0 to 99 minutes. If the soldering iron or desoldering gun remains in sleep mode for the set shutdown time, the unit will automatically power off.

Figure 10: Automatic shutdown timer setting on the control unit, configurable from 0-99 minutes for enhanced safety.

6.8 Buzzer Configuration

The unit features a configurable buzzer for audible alerts. You can turn the buzzer sound on or off according to your preference. Refer to the control unit's buttons (often indicated by a speaker icon or similar) to access this setting.

Figure 11: Buzzer configuration options on the control unit, showing how to turn the buzzer sound on or off.

7. Maintenance

7.1 Desoldering Gun Cleaning

Regular cleaning of the desoldering gun is essential to prevent clogging and maintain optimal suction performance.

Nozzle Cleaning: Use the provided cleaning needle to unclog the desoldering nozzle after each use or when suction decreases.
Filter Tube Cleaning: Periodically disassemble the desoldering gun (refer to Section 5.2) and empty the accumulated tin from the filter tube. Clean the filter and filter tube thoroughly.

Instructions for cleaning the desoldering gun nozzle and filter tube — Figure 12: Instructions for cleaning the desoldering gun nozzle with a cleaning needle and disassembling the filter tube to remove accumulated tin.

7.2 Soldering Tip Care

Proper care of soldering tips extends their life and ensures efficient heat transfer.

Tinning: Always tin the soldering iron tip with a thin layer of solder before and after use, and during prolonged idle periods. This prevents oxidation.
Cleaning: Use a damp sponge or brass wool to wipe the tip clean of excess solder and flux residue.
Storage: Store tips properly tinned and in a dry environment.

Comparison of a new tip and a tinned tip after heating — Figure 13: Illustration of a soldering tip before use (left) and after heating and tinning (right), showing proper tinning for optimal performance.

8. Troubleshooting

Unit not powering on: Check power cord connection and ensure the power switch is ON. Verify the power outlet is functional.
Tools not heating up: Ensure the correct tool (soldering iron or desoldering gun) is selected via the toggle switch. Check connections to the control unit.
Desoldering gun has weak suction: Check for clogs in the nozzle or filter tube (refer to Section 7.1). Ensure the vacuum hose is securely connected.
Temperature deviation: Perform temperature calibration as described in Section 6.3.2.
Solder not melting easily: Increase the set temperature. Ensure the tip is clean and properly tinned.

9. User Tips

Identify Accessories: Some accessories, like the rubber item with a square and pointer, are often cleaning tools or specialized components. Refer to the detailed parts diagram (if available in a separate PDF manual) or experiment carefully to understand their function, typically for cleaning nozzles or handling small parts.
Preheat Patience: The desoldering gun requires a full 10 minutes to preheat. Do not attempt to use the vacuum function before the 'Pht' indicator disappears and the unit beeps, as this can lead to inefficient desoldering and potential damage.
Regular Cleaning: To maintain strong vacuum suction and prevent frustrating clogs, clean the desoldering gun's nozzle and filter tube frequently, especially after working with lead-free solder which can be more prone to clogging.
Temperature for Lead-Free: When working with lead-free solder, you may need to set slightly higher temperatures for both soldering and desoldering compared to traditional leaded solder.

10. Warranty and Support

For warranty information, technical support, or to inquire about spare parts and consumables, please contact your original point of purchase or the manufacturer directly. Keep your purchase receipt as proof of purchase.

YIHUA 948-I