Service Support

Rongda RP400 Thermal Transfer Label Printer LED Indicator Lights and Button Function Description

2026-01-13

RongdaRP400 Thermal Transfer Label PrinterLED indicator lights and button function descriptions

This printer has one button and one indicator light. Pressing the button or using the power switch in conjunction with the indicator light will activate multiple functions of the printer, such as: paper feed, pause printing, print self-test page, and initialize the printer. Please see the description below.

1. LED indicator lights

The LED indicator light is matched with the buzzer, as shown below:

Rongda RP400 Thermal Transfer Label Printer LED Indicator Lights and Button Function Description

2. General button functions

1) Paper feed

When the printer is ready (LED is fixed in blue), press a button and the label will move to the front of the next label.

2) Printing paused

If the printer is printing, pressing the FEED button once will pause printing. Simply press the button again to resume printing.

3. Power-on function

This printer has three power-on functions that can be used to configure or test the printer hardware. These functions are activated by pressing and releasing the power button while the printer is powered on.

Please follow these steps to enable the power-on function:

Rongda RP400 Thermal Transfer Label Printer LED Indicator Lights and Button Function Description

3.1 Carbon ribbon detection

This setting is used during printing to determine if the ribbon is installed, depleted, and functioning properly. This function requires thermal printing to be enabled.

3.2 Print the self-test page

This function displays the printer's internal parameters after the printer is turned on, allowing users to view the machine's settings and determine if the machine is functioning correctly.

Please follow these steps to calibrate the sensor on the label:

1) Please confirm that the label paper has been installed properly.

2) Turn off the printer.

3) Press and hold the paper feed button while turning on the printer.

4) Release the paper feed button when the printer feeds paper and prints content.

5) The printed content is the self-test page style.

Self-test page style

Before connecting the printer to the computer, it can print out a self-test value, which you can use to confirm whether the printer is functioning properly. The printed self-test value can be used to check the print quality of the print head and understand the internal settings of the printer.

3.3 Printer Initialization

The printer initialization function clears the downloaded files in the memory (DRAM) and restores the printer parameters to their factory settings.

Please follow these steps to initialize the function:

1. Turn off the power.

2. Open the printhead cover, press and hold the FEED button on the printer, then turn on the printer power and hold the FEED button for 10 seconds.

3. When all the printer indicator lights are off, release the FEED button. The printer will then restart, indicating that the printer initialization process is complete.

After initialization, the printer configuration will revert to the default settings as follows:

The printhead pressure is adjustable, located only below the ribbon recovery shaft at the top of the printhead. There are two adjustable levels. It is essential to ensure that the two levels are the same, otherwise the printing effect will be severely affected.