Introduction
This user manual provides detailed instructions for the installation, operation, and maintenance of your SUNMI NT311 Thermal Receipt Printer. Designed for efficiency and reliability, this printer is ideal for various point-of-sale environments. Please read this manual thoroughly before using the printer to ensure proper functionality and to prevent damage.
Safety Information
- Always use the original power adapter provided with the printer.
- Do not expose the printer to water, moisture, or extreme temperatures.
- Avoid placing the printer in direct sunlight or near heat sources.
- Do not attempt to disassemble or repair the printer yourself. Contact qualified service personnel for assistance.
- Ensure proper ventilation around the printer during operation.
Product Overview
The SUNMI NT311 is a high-performance direct thermal receipt printer featuring multiple connectivity options and automatic paper cutting. Its compact design makes it suitable for various business settings.
Key Features:
- Direct thermal printing method.
- Maximum print width: 80 mm.
- Connectivity: IEEE 802.11 b/g/n 2.4G Wi-Fi, BT4.2 BLE 2.4 GHz, USB TYPE-C USB2.0, Ethernet RJ45 (max. 100 Mbps).
- Cash Drawer Port: RJ12 24V/1A.
- Dimensions: 130 x 130 x 130 mm.
- Supports ESC/POS command set.
- Protection Level: IP52.
- Memory: 64 MB RAM, 256 MB Flash.
- Automatic Paper Cutting: Full Cutting/Half Cutting Mode.
Printer Components:
Setup Guide
1. Unpacking
Carefully remove the printer and all accessories from the packaging. Verify that all components are present:
- SUNMI NT311 Printer
- Power Adapter
- USB Cable (if included)
- Quick Start Guide
2. Connecting Power
- Connect the power adapter to the DC 24V/2.5A power input port on the back of the printer.
- Plug the power adapter into a suitable electrical outlet.
- The power indicator light on the printer should illuminate.
3. Loading Thermal Paper
- Open the printer cover by pushing the cover open lever.
- Insert a roll of 80mm thermal paper into the paper compartment, ensuring the paper feeds from the bottom of the roll towards the front of the printer.
- Pull a small amount of paper out past the cutting blade.
- Close the printer cover firmly until it clicks into place.
4. Connecting to Devices
USB Connection:
Connect the printer to your computer or POS system using the provided USB TYPE-C USB2.0 cable.
Ethernet (LAN) Connection:
Connect an Ethernet cable from your network router or switch to the RJ45 LAN port on the printer. The printer supports speeds up to 100 Mbps.
Bluetooth Connection:
- Ensure Bluetooth is enabled on your host device (e.g., smartphone, tablet, computer).
- Search for available Bluetooth devices. The printer will typically appear as "SUNMI NT311" or a similar name.
- Select the printer and pair it. You may be prompted for a PIN (default is usually "0000" or "1234").
Cash Drawer Connection:
Connect your cash drawer to the RJ12 24V/1A port on the printer. The printer will trigger the cash drawer when a print command is sent.
Operating Instructions
Basic Printing:
Once the printer is connected and drivers (if required for your operating system, e.g., Windows) are installed, you can send print commands from your application. The printer will automatically print and cut the receipt.
Indicator Lights:
- Power Indicator: Indicates the printer's power status.
- Paper Exhaustion Sensor: Alerts when paper is low or out.
- Anomality Indicator: Indicates an error condition (e.g., cover open, print head overheat).
- Network Indicator: Shows network connectivity status (for Ethernet/Wi-Fi models).
Maintenance
Cleaning the Printer:
Regular cleaning helps maintain print quality and extends the printer's lifespan.
- Turn off the printer and unplug the power cord.
- Open the printer cover.
- Use a soft, lint-free cloth dampened with isopropyl alcohol to gently clean the thermal print head (the dark strip inside the printer). Allow it to dry completely before closing the cover.
- Clean the paper path and rollers with a dry, soft cloth to remove any paper dust.
- Wipe the exterior of the printer with a slightly damp cloth.
Caution: Do not touch the print head immediately after printing as it may be hot. Avoid using abrasive cleaners or solvents.
Replacing Paper Roll:
When the paper exhaustion sensor indicates low paper, or when the print quality degrades due to the end of the roll, replace the paper following the steps in the "Loading Thermal Paper" section.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Printer does not power on. | Power cable not connected; power outlet faulty. | Ensure power cable is securely connected. Try a different power outlet. |
| No print output. | Paper out; printer cover open; incorrect driver/connection. | Load new paper. Close cover firmly. Check driver installation and connection (USB/Ethernet/Bluetooth). |
| Poor print quality. | Thermal head dirty; low quality paper; paper loaded incorrectly. | Clean the thermal print head. Use high-quality thermal paper. Ensure paper is loaded correctly. |
| Paper jam. | Paper loaded incorrectly; foreign object in paper path. | Open cover, remove jammed paper carefully. Reload paper correctly. Check for obstructions. |
| Printer not connecting via Bluetooth. | Bluetooth not enabled on host; incorrect pairing. | Ensure Bluetooth is on and discoverable on host device. Re-pair the printer. Check PIN. |
Specifications
| Feature | Description |
|---|---|
| Brand | SUNMI |
| Model Number | Sunmi NT311 |
| Print Method | Direct Thermal |
| Max Print Width | 80 mm |
| Connectivity Technology | Bluetooth 2.4 GHz, Ethernet (RJ45), USB (Type-C USB2.0) |
| Wireless Connectivity | IEEE 802.11 b/g/n 2.4G, BT4.2 BLE 2.4 GHz |
| Cash Drawer Port | RJ12 24V/1A |
| Dimensions (L x W x H) | 130 x 130 x 130 mm |
| Protection Level | IP52 |
| Memory | 64 MB RAM, 256 MB Flash |
| Paper Thickness | 0.075 - 0.008 mm |
| Print Speed | 250 mm/s |
| Automatic Paper Cutting | Full Cutting / Half Cutting Mode |
| Compatible Operating Systems | Windows, Android |
| Power Consumption | 3 Watt |
Warranty and Support
For warranty information, please refer to the documentation provided at the time of purchase or contact your retailer/seller directly. SUNMI provides technical support for its products.
For further assistance, troubleshooting, or to inquire about service, please visit the official SUNMI support website or contact their customer service department. Keep your purchase receipt and product serial number handy when seeking support.
