1. Introduction
The GOOJPRT QR204 is a compact and efficient 58mm mini embedded thermal printer designed for various commercial applications. It supports TTL, RS232, and USB interfaces, offering versatility for integration into different systems. This manual provides essential information for the proper setup, operation, and maintenance of your printer.
Figure 1: GOOJPRT QR204 Mini Embedded Thermal Printer
2. Safety Information
- Do not expose the printer to water or moisture.
- Avoid operating the printer in extremely hot or cold environments.
- Use only the specified power supply (DC 5V-9V) to prevent damage.
- Keep the printer away from strong electromagnetic fields.
- Do not attempt to disassemble or repair the printer yourself. Contact qualified personnel for service.
3. Package Contents
Please check the package for the following items:
- 1 x GOOJPRT QR204 Thermal Printer
- 1 x USB Cable
- 1 x Wiring Harness
- 1 x Thermal Paper Roll (for initial testing)
Figure 2: Package Contents
4. Product Overview and Features
The QR204 printer boasts a decent mini body, making it practical and portable for various embedded applications. Its design allows for convenient paper replacement from the front panel. It utilizes low-noise thermal printing technology, ensuring quiet operation. With a printing speed of up to 80mm/s, it significantly enhances working efficiency. The printer requires no ribbon or cartridge, reducing consumables and promoting environmental friendliness. It supports ESC/POS print commands for broad compatibility.
Figure 3: Printer Detail Diagram
Applications
This printer is suitable for a wide range of commercial and industrial applications, including:
- Medical Equipment
- Industrial Instruments
- Food Detectors
- Weighing Equipment
- Gas Stations
- Register Machines
Figure 4: Range of Application
5. Specifications
| Feature | Specification |
|---|---|
| Color | White, Black |
| Interface | RS-232+USB/ TTL+USB (Optional) |
| Printing Method | Thermal |
| Resolution | 8 dots/mm, 384 dots/line (203dpi) |
| Effective Print Width | 48mm |
| Character Set | ASCII, GB2312-80 (Chinese) |
| Print Fonts | ANK: 5 x 7, Chinese: 12 x 24, 24 x 24 |
| Paper Type | Thermal paper |
| Paper Width | 57.5 +/- 0.5mm |
| Roll Diameter | 30mm (max) |
| Reliability (MCBF) | 500 million lines |
| Embed Depth | 43mm |
| Power Supply (Adapter) | DC 5V-9V |
| Operating Temperature | 5℃-50℃ |
| Operating Humidity | 10%-80% |
| Storage Temperature | -20℃-60℃ |
| Storage Humidity | 10%-90% |
| Compatible System | Windows, iOS, Android |
| Item Size | 8 x 5.7 x 4.3cm / 3.1 x 2.2 x 1.7in |
| Item Weight | 106g / 3.7oz |
6. Setup
6.1 Driver Installation
Before using the printer, you must install the necessary drivers and setup tools. There is no driver CD included in the package. Please download the driver, setup tool, and detailed instructions from the following link:
https://u.pcloud.link/publink/show?code=XZTEmD0Z4y12UNfMhvRhK5PgyxChRbKpikM7
Follow the instructions provided in the downloaded package for proper installation on your operating system (Windows, iOS, Android).
6.2 Paper Roll Installation
The QR204 printer features an easy paper structure for convenient loading.
- Open the paper outlet cover on the front panel of the printer.
- Insert a 58mm thermal paper roll into the compartment, ensuring the paper feeds from the bottom and the leading edge extends out of the paper outlet.
- Close the paper outlet cover securely.
Video 1: Demonstration of paper roll installation and test printing.
Figure 5: Easy Paper Structure for replacement from the front panel.
6.3 Connecting the Printer
The printer offers multiple interface options:
- USB Interface: Connect the printer to your host device using the provided USB cable.
- TTL/RS232 Serial Interface: Use the wiring harness to connect the 5-Pin Serial Port to your system's TTL or RS232 interface, depending on your printer model. Ensure correct pin assignments (TX, RX, GND, etc.).
- Power Connection: Connect the 3-Pin Power Port to a DC 5V-9V power source.
Figure 6: Printer Interface Ports
Figure 7: Detailed view of the Power Outlet, TTL & RS232 Outlet, and USB Outlet.
7. Operating Instructions
7.1 Basic Printing
Once the printer is connected and drivers are installed, you can initiate printing from your application. The printer supports ESC/POS print commands, allowing for flexible control over print content and formatting.
Figure 8: Example of Thermal Printing
7.2 Low-Noise Operation
The QR204 printer is designed for low-noise thermal printing, making it suitable for environments where quiet operation is desired.
Figure 9: Low-noise Printing
7.3 Printing Effect
The printer delivers clear and consistent print quality. The print density can be adjusted via software settings if needed.
Figure 10: Printing Effect Examples
8. Maintenance
8.1 Cleaning the Print Head
To ensure optimal print quality and prolong the life of your printer, regularly clean the thermal print head.
- Turn off the printer and disconnect the power cable.
- Open the paper cover.
- Use a soft cloth dampened with isopropyl alcohol to gently wipe the print head surface.
- Allow the print head to dry completely before closing the cover and reconnecting power.
8.2 Paper Handling
- Use only high-quality thermal paper to prevent damage to the print head and ensure clear prints.
- Store thermal paper in a cool, dry place away from direct sunlight and heat.
- Avoid using wrinkled or damaged paper rolls.
9. Troubleshooting
- No Power: Ensure the power cable is securely connected and the power supply is providing the correct voltage (DC 5V-9V).
- No Print: Check if the paper roll is installed correctly and has enough paper. Verify the interface connection (USB, TTL, RS232) and driver installation.
- Unclear Print: The print head might be dirty. Refer to the cleaning instructions in Section 8.1. Ensure you are using good quality thermal paper.
- Paper Jam: Open the paper cover, remove any jammed paper, and ensure the paper path is clear before re-inserting the paper roll.
- Communication Error: Verify that the correct interface (USB, TTL, RS232) is selected in your software settings and that the baud rate matches the printer's configuration.
10. User Tips
- For embedded applications, consider the printer's compact size (8 x 5.7 x 4.3cm) and embed depth (43mm) for seamless integration.
- If using the TTL or RS232 interface, double-check the wiring harness connections to ensure proper data transmission.
- Regularly check the paper roll diameter (max 30mm) to avoid overfilling the compartment, which can lead to feeding issues.
- Keep the driver and setup tool downloaded from the provided link handy for future re-installations or configuration changes.
11. Warranty and Support
This product is covered by the 'Shop's Three Guarantees' as per the seller's policy. For technical support, driver issues, or warranty claims, please contact your point of purchase or the manufacturer directly. Ensure you have your product model number (QR204) and purchase details available when seeking support.
