1. Introduction
This manual provides detailed instructions for the safe and efficient operation, maintenance, and troubleshooting of your PROBON Signal fire AI-6A Optical Fiber Fusion Splicer. Please read this manual thoroughly before using the device to ensure optimal performance and longevity.
Key Features:
- Faster Splicing & Heating: Achieves an 8-second splice time and 18-second heat time, capable of approximately 160 continuous splices and heats.
- Professional Design: Utilizes core alignment technology with auto-focus and six motors for precise splicing and minimal loss.
- 3-in-1 Fiber Holder: Compatible with SM (G.652 & G.657), MM (G.651), DS (G.657), NZDS (G.655) fibers, including bare fiber, pigtail, rubber-insulated, and multi-fiber cables.
- Clear LCD & Long Time Standby: Features a 5-inch high-resolution screen with up to 300x focus magnification (X/Y Axis separately) or 150x (X/Y Axis simultaneously). Equipped with a 5200 mAh lithium battery for approximately 160 continuous splices and heats.
- Intelligent Interaction: Connects to a mobile app, supports ten languages (English, French, Russian, Italian, Portuguese, Polish, Spanish, Thai, Arabic), allowing data checking, download, and indefinite storage of splicing records.

2. Setup
2.1 Unpacking and Inspection
Carefully unpack all components and inspect for any damage. Ensure all accessories listed in the product packaging are present. The package typically includes the fusion splicer, fiber cleaver, wire stripping pliers, miller stripper, and adapter.
2.2 Charging the Battery
The AI-6A is equipped with a 5200 mAh high-capacity lithium battery. Connect the provided adapter to the charging port. A full charge takes approximately 3.5 hours. The device features dual charging paths, allowing continued charging even if one path experiences a fault.

2.3 Mobile App Connection (Optional)
For enhanced functionality, download the "SignalFire2" mobile application from Google Play or the App Store. This allows for viewing, setting parameters, managing data, and upgrading the device via your mobile phone. Refer to the on-screen QR code for direct download links.
3. Operating Instructions
3.1 Preparing the Fiber
- Strip the Fiber: Use the provided wire stripping pliers or miller stripper to remove the outer jacket and coating from the fiber, exposing the bare fiber.
- Clean the Fiber: Clean the stripped fiber with an alcohol wipe to remove any residue.
- Cleave the Fiber: Place the cleaned, stripped fiber into the fiber cleaver (e.g., S07 Fiber Cleaver) and perform a precise cleave to create a clean, perpendicular end face.

3.2 Splicing Operation
- Place Fiber in Holder: Open the splicer lid and carefully place the prepared fibers into the 3-in-1 fiber holders. Ensure the fiber ends are correctly positioned in the V-grooves. The holder supports bare fiber, pigtail fiber, and drop cable fiber.
- Close Lid and Initiate Splicing: Close the splicer lid. The device will automatically align the fibers using its six motors and perform the fusion splice. The splicing process takes approximately 8 seconds.
- Inspect Splice: After splicing, the estimated splice loss will be displayed on the 5-inch LCD screen. Typical splice loss for SM fiber is 0.025dB.

3.3 Heating and Protection
- Position Splice in Heater: Once the splice is complete, carefully move the spliced fiber into the heating oven.
- Initiate Heating: Close the heater cover. The device will automatically heat the splice protector sleeve. The heating process takes approximately 18 seconds.
- Cool Down: After heating, allow the splice to cool down before handling.
3.4 Additional Features
- USB Power Output: The USB interface can provide 5 volts output, allowing you to charge mobile phones or other small electronic devices.
- Built-in Night Light: Activate the built-in night light for improved visibility when working in dark environments.
- Portable Strap: The splicer comes with a portable strap and a toolbox strap, enabling hands-free operation for high-place installations.
4. Maintenance
4.1 Cleaning
- Regularly clean the V-grooves, electrodes, and objective lenses with a lint-free swab and alcohol to ensure optimal splicing performance.
- Keep the screen clean and free from dust and debris.
4.2 Electrode Replacement
Electrodes have a limited lifespan. When the splicer indicates electrode wear or splicing performance degrades, replace them according to the instructions provided in the full user manual or contact customer support.
4.3 Battery Care
- Charge the battery fully before first use.
- Avoid completely discharging the battery to prolong its lifespan.
- Store the device in a cool, dry place when not in use for extended periods.
5. Troubleshooting
This section provides solutions to common issues. For more complex problems, refer to the full user manual or contact customer support.
5.1 Common Issues and Solutions
- High Splice Loss:
- Ensure fibers are clean and properly cleaved.
- Check for dirty V-grooves or objective lenses.
- Inspect electrodes for wear and replace if necessary.
- Verify fiber type settings match the actual fiber being spliced.
- Splicer Not Powering On:
- Check battery charge level.
- Ensure the power adapter is correctly connected if charging.
- Heating Failure:
- Ensure the heater cover is fully closed.
- Check for any obstructions in the heating oven.
6. Specifications
| Feature | Specification |
|---|---|
| Model Number | AI-6A |
| Splicing Time | 8 seconds |
| Heating Time | 18 seconds |
| Fiber Alignment | Core Alignment (Six Motors, Auto-focus) |
| Applicable Fibers | SM (G.652 & G.657), MM (G.651), DS (G.657), NZDS (G.655), Bare Fiber, Pigtail, Rubber-insulated, Multi Fiber Cable |
| Typical Splice Loss | 0.025dB (SM), 0.01dB (MM), 0.04dB (DS/NZDS) |
| Screen | 5-inch High-Resolution LCD |
| Magnification | 300x (X/Y separately), 150x (X/Y simultaneously) |
| Battery Capacity | 5200 mAh Lithium Battery |
| Battery Life | Approx. 160 continuous splices and heats |
| Charging Time | ≤ 3.5 hours |
| Power Source | Battery Powered |
| USB Output | 5V (for charging mobile devices) |
| Included Components | Fusion splicer, Fiber Cleaver, Wire stripping pliers, Miller stripper, Adapter |
| Manufacturer | Signal fire |
7. Warranty and Support
For detailed warranty information, please refer to the warranty card included with your product or contact the manufacturer directly. For technical support, service, or spare parts, please reach out to PROBON customer service through their official channels.
You can visit the PROBON Store on Amazon for more information: PROBON Store