Troubleshooting Guide for POS Terminal System

Checking Power Connections

Verify Power Supply:

  • Ensure that all devices are plugged into a power source.
  • Check that the power outlets are working by plugging in another device.

Device-Specific Power Checks:

  • Adyen P400 plus (wired): Ensure the power adapter is securely connected to both the terminal and the power outlet. If the terminal is unresponsive, remove the power cord from the terminal (either by pulling it from the socket or removing it from the terminal itself).
  • Adyen P400 plus (wireless): Ensure the power adapter is securely connected to both the terminal and the power outlet.
    If the terminal is unresponsive, press and hold (9) and the GREEN button at the same time, then enter the admin pin (contact for pin) and select Restart/Power Off (6).
  • Star mC-print3 Printer: Check that the printer's power cable is firmly connected to the printer and the power source.
  • EloTouch Computer: Verify that the computer is receiving power. If not, check the USB or power cable connections.

Checking Network Connections

WiFi Connection

  • Ensure WiFi is Enabled: Check the wireless settings on each device to confirm WiFi is turned on.
  • Reconnect to WiFi Network: Go to the network settings on each device and reconnect to the WiFi network. Enter the password if prompted.
  • Restart Router: If none of the devices connect, try restarting the WiFi router.
  • Adyen P400 plus (wireless): On the terminal, press and hold (9) + GREEN button at the same time. This will take you to the admin menu.
    Press (1) Network (2) Wi-Fi The connected Wi-Fi will now be displayed. Press (3) Scan networks.
    Tap the name of the network and enter the password. Note that the Wi-Fi selected must belong to the same network as your other wired POS hardware devices are connected to. The terminal sets the network as default automatically and connects to it. Press the RED button to return to Start.

Ethernet Connection

  • Check Ethernet Cables: Ensure all Ethernet cables are securely plugged into the devices and the network switch or router.
  • Verify Network Status: Check the network status indicators on the devices. Typically, a green light indicates a good connection.
  • Restart Devices: Restart the devices after confirming the Ethernet connections to refresh the network settings.
  • Adyen P400 plus (wired): Ensure that an Ethernet cable is connected to the ETH port on the dongle, and that the other end of the Ethernet cable is correctly connected to the network source.

Adyen Credit Card Terminal


  • Restart the Terminal: For the Adyen P400 plus (wired), unplug the terminal from the power source, wait for 10 seconds, and plug it back in. For the Adyen P400 plus (wireless), press and hold (9) and the GREEN button at the same time, then enter the admin pin (found in Adyen Backoffice) and select Restart/Power Off (6).
  • Check for Error Messages: Note any error messages displayed and refer to the Adyen user manual for specific troubleshooting steps.
  • Update Software: Ensure the terminal's software is up to date. Follow the manufacturer's instructions for updating firmware and software. On the Adyen P400 plus, press and hold (9) + the GREEN button, enter the admin pin (contact for pin), then press (2) Software GREEN to update software. Please call Adyen support if you need help updating the configuration.

Star mC-print3 Printer

Recommended Receipt Printer: mC-Print3 Troubleshooting – Dutchie

  • Check Printer Status: Ensure the printer is turned on and check for any error lights or messages.
  • Wireless LAN Unit: If using the optional Wireless LAN unit, ensure it is properly installed and connected to the WiFi network.
  • Print Printer Self-Test: Turn off the printer by pressing the power button. Hold down the feed button while turning the printer back on. A test page will print, providing information about the printer and its network status.
  • Additional Resources: For more help, visit the Star mC-print3 Support Page.

EloTouch Android Computer

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  • Check WiFi/Ethernet Connection: Ensure the computer is connected to the internet either via WiFi or Ethernet.
  • Restart the Computer: Hold down the power button until the restart option appears, then restart the device.
  • Additional Resources: For more help, visit the EloTouch Touchscreen Computers Support Page.

Additional Resources

By following these troubleshooting steps, you should be able to resolve most common connectivity and power issues with your POS terminal system. For persistent problems, consider reaching out to your hardware manufacturer’s support or your IT department for further assistance.

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