If the Power LED does not light up when the power is turned on, it may mean that the power cable or AC adapter is not correctly connected. Please check the connection. And make sure that the power socket is correctly connected.

To turn the power on, press the Power button. When the Power LED lights up, release the Power button.

Please check that the Power LED is turned on.

If the Power LED does not light up when the power is turned on, it may mean that the power cable or AC adapter is not correctly connected. Please check the connection. It may also mean that the power socket is loose. Check and make sure that the power socket is correctly connected.

Check that the Power LED has lit up blue and that the Network LED has lit up green.

The Network LED is turned off.

The LED display shows "Link down: Physically disconnected". Check and make sure that the LAN cable is correctly connected.

• It may also mean that the connector is loose. Confirm that both the LAN connectors of the printer and network device (router, hub and such) are securely connected.
• The LAN cable may have been damaged. When the Network LED does not light up even if the LAN cable is reconnected, confirm by connecting a different LAN cable.
• Check and make sure that the network device to be connected is working correctly.

The Network LED is blinking.

The LED display shows "Link down: IP address cannot be obtained". When a DHCP server is provided, check whether it is available.

If the printer network setting has been changed using Web Configuration or Telnet and the printer has become unable to be connected, it may be possible for the printer to connect to the network when the network setting is initialized.

Perform "Initialize Communication Settings (Network)" once, and check the connection.

To connect to Web Configuration, please enable the JavaScript setting in your web browser (Active Scripting in Internet Explorer).

Up to 2 devices can access Web Configuration at the same time.
If more than 2 devices need to access the site, please try after data of the previous 2 devices is completely read (after more than 5 seconds)

The Web Configuration may display incorrectly if connecting with "https://[Printer IP address]" (SSL/TLS encryption).

Use "http://[Printer IP address]" (No SSL/TLS encryption) when opening the Web Configuration.

The SteadyLAN function cannot be used with the MCP20B, MCP20 model.
With the MCP21LB, MCP21LBNH model, this function can be used only with iOS devices (iPad, iPhone, etc.).
Use Star SteadyLAN

To check the model name of your printer, refer to Check Model.

To use SteadyLAN, SteadyLAN must be set to "Enable for iOS".
Use the dedicated app to check the printer SteadyLAN setting.
Use Star SteadyLAN

In order to use SteadyLAN, the LAN cable and Lightning cable must be connected.
Check and make sure that the LAN cable is correctly connected to the printer and network device. Also check that the Lightning cable is correctly connected to the printer USB-A (2.4A) port and the iOS device.
Use Star SteadyLAN

In order to use SteadyLAN, it is necessary to configure the printer network settings. Check and make sure that the printer network communications are functioning correctly.
Connect Tablet/PC (LAN)

The mC-Print2 firmware version must be Ver. 2.3 or later in order to use the SteadyLAN function with mC-Print2. Check the firmware version of the mC-Print2 that you are using. The firmware version is shown in the title section of the printer information (page 1) that is printed using the Self-Printing function.
Self-Printing

If the firmware version of the mC-Print2 that your are using is earlier than Ver. 2.2, use the dedicated app and update the firmware.
Use App

In order to create a stable wired LAN connection, set the iOS device [Settings]-[Wi-Fi] to "OFF".
Use Star SteadyLAN

If SteadyLAN is enabled, when an iOS device is connected to USB port 2.4A on the printer that is wired to a network, the connection takes priority over the wireless LAN connection, and the device switches to a wired LAN connection via USB-A (2.4A).

Wired LAN connection via USB-A (2.4A) with SteadyLAN stabilizes communication, however the transmission rate is approx. 1Mbps, which might be less than wireless LAN.
Use App

Bluetooth communication is not supported when the MCP20 model is used.
To check the model name of your printer, refer to Check Model.

Please check that the Power LED is turned on.
If the Power LED does not light up when the power is turned on, it may mean that the power cable or AC adapter is not correctly connected. Please check the connection. It may also mean that the power socket is loose. Check and make sure that the power socket is correctly connected.

iOS devices
Please check that the Power LED and Bluetooth LED have lit up blue.
If the LED display shows "Bluetooth not connected" (the Power LED lights up blue and the Bluetooth LED is turned off), Bluetooth connection is disabled.
Open the Bluetooth Setting of the host device, and check whether the connection with the desired printer is completed.

Other than iOS devices (Android, etc.)
Please check that the Power LED has lit up blue.
The Bluetooth LED only lights up blue when printing or status acquirement is performed via Bluetooth.
Open the Bluetooth Setting of the host device, and check whether the pairing with the desired printer is completed.

Check whether the printer is already connected to another iOS device via Bluetooth.

If connected, then remove the connection to the connected iOS device, and then try to connect to the Bluetooth from another host device.

A single iOS device (iPad, iPhone, etc.) cannot be connected simultaneously via Bluetooth and USB-A (2.4A).

When the iOS device connected via Bluetooth is connected to USB-A (2.4A), communication and power supply are established for the device connected to USB-A (2.4A), and the Bluetooth connection is released.

When [New Pairing Permission], in which you can check or change the setting with the dedicated app, is set to OFF (disable), a printer search or new pairing from a device other than the connected tablet is not available due to enhanced security.

To set [New Pairing Permission] to ON (enable), initialize the network settings (Bluetooth).

The communication status of the Bluetooth printer will depend on any nearby radio waves, presence of interference, and the environment in which it is installed. When installing this product, perform a thorough evaluation beforehand.

Take the necessary measures after referring to Precautions on Bluetooth printer use.

USB connection of iOS devices (iPad, iPhone, etc.) is not supported when the MCP20 or MCP20B model is used.
To check the model name of your printer, refer to Check Model.

The USB cable connection method varies depending on the operating system of your PC, smartphone, or tablet. Check whether the cable is correctly set to suit your environment.

• It may also mean that the connector is loose. Check that the USB cable or Lightning cable is correctly connected between the printer and the PC, smartphone, or tablet.
• The USB cable or Lightning cable may have been damaged. If this error recurs after the cable is connected again, connect another cable, and check the status.

If you connect the USB cable before installing the Windows printer driver to use the Windows printer driver in a Windows device, the printer is not correctly recognized by the operating system.

If you have failed to connect the USB cable and create a printer queue before installing the Windows printer driver, follow the steps below to erase or uninstall the device.

1. Start Device Manager while the printer remains connected.
2. Right-click "Other Device" - "StarMCP21(STR-001)", and select "Uninstall Device (Windows 10)" or "Delete (Other than Windows 10)" from the pull-down menu.
3. When "Check Device Uninstallation" is displayed, check the status, and execute uninstallation.
4. Disconnect the USB cable from the printer or turn the printer off.

After installing the Windows printer driver, connect the USB cable and turn the printer on again.

USB-A (2.4A) and USB-B cannot be used simultaneously as the host device.

When both devices are connected while the printer remains turned on, only communication with the first connected device is established. When the printer is turned on while both devices are connected, the machine preferentially communicates with the Windows or Android device connected to USB-B while only providing power at a maximum of 1.5A to the iOS device connected to USB-A (2.4A).

If an unnecessary cable is connected, disconnect it.
Otherwise, examine connecting either device to another interface.

All models
USB-B is available for communication with Windows, Android, Mac, and Linux devices. It is not available for connection with other USB devices.

MCP21LB, MCP21LBNH model
The USB-A (2.4A) provides communication and power supply to iOS devices (iPhone, iPad, etc.) and USB-connectable devices*; it provides power supply only (1.5A max.) to other USB devices.
USB-A (0.5A) only provides communication with USB-connectable devices*; it only supplies power (0.5A max.) to other USB devices.

*USB-connectable devices : BSH-20U, BSH-20B, BSD-40U, BSH-32U, BSH-32B, SCD222U, BCP-POP1 and USB HID (Keyboard) class Devices

Please check that the Power LED is turned on.
If the Power LED does not light up when the power is turned on, it may mean that the power cable or AC adapter is not correctly connected. Please check the connection. It may also mean that the power socket is loose. Check and make sure that the power socket is correctly connected.

Check that the Power LED has not lit up red.

If the printer cover is not closed securely, it causes a cover open error (the Power LED lights up red), which results in a printing failure.
To close the printer cover, push both of its sides.

If a white sheet is being ejected, then it may be possible that the paper roll is set in the opposite direction. Check the direction of the paper roll to make sure that the paper is set correctly.

As this product is a thermal printer, it will not print on ordinary paper. Also, if there are issues such as faint printing of words, the cause may be that the paper does not meet the specifications, or the paper has become old and deteriorated.

Check the appropriate paper roll specifications and use paper that meets the printer's specification.

If the Power LED is blinking or it has lit up or is blinking in a color other than blue, refer to the LED Display and check the product status.

If you can hear the printer operating but the paper is not being ejected, there is a possibility that a paper jam is occurring or the paper is being rolled onto the rubber roller. If a paper jam occurs, remove the paper in question, referring to "Paper Jam".

Check whether Self-Printing works correctly.

When Self-Printing works correctly, check whether the app, software, and printer settings are correctly configured.

Do not touch the paper or block the outlet while the paper is being discharged.

When the width, thickness, or other details do not meet the required specifications, it may easily cause paper jams.

Check the appropriate paper roll specifications and use paper that meets the printer's specification.

If the printer cover does not close, confirm that the diameter of the paper roll is 50mm or smaller.

Check the appropriate paper roll specifications and use paper that meets the printer's specification.

To set paper, check whether any foreign matter such as a paper core is in the paper roll holder.

The tablet charging function is not supported when the MCP20 or MCP20B model is used.
To check the model name of your printer, refer to Check Model.

Check that the Power LED of the main unit has lit up.

USB peripherals such as tablets can only be charged while the power of the main unit is on.

Check that the USB cable or Lightning cable of the tablet is securely connected to USB-A (2.4A) or USB-A (0.5A) of the main unit.

If the device is connected to USB-B, charging is not performed. In Windows, Android, Mac, or Linux, USB communication and charging cannot be performed simultaneously.

To charge a device, use USB-A (2.4A) or USB-A (0.5A). While USB-B is connected, power at a maximum of 1.5A is supplied to USB-A (2.4A) even when an iOS device is used.

The electric energy supplied from USB-A (2.4A) is at a maximum of 2.4A when an iOS device is connected, and at a maximum of 1.5A when a USB device other than an iOS device is connected. When you want to charge a USB device other than an iOS device, check the amount of energy required to charge the USB device.

When an iOS device is connected to USB-A (2.4A) during USB-B connection, power at a maximum of 1.5A is supplied to the iOS device.

Using the dedicated app, you can easily check the printer configuration information.

You can also check settings using the self-printing function.

To use a Mac or Linux device, you need to install the dedicated driver.
For details on the connection procedure and how to install the driver, refer to here.

This machine provides the de-curl function to correct curls generated in thermal paper roll. The de-curl mechanism is always running during paper feeding.

• However, this function cannot remove curls completely.
• A receipt may be slightly folded near the top depending on the time in which receipt paper is left during the period from when a receipt is printed until the next one.
• The de-curl effect varies depending on the paper you use or your environment.
• Depending on the type or remaining amount of thermal paper roll, a receipt may be warped in a direction opposite to the normal direction by the de-curl function.