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SUNMI T3 80mm Guide

Learn how to power on the SUNMI T3 80mm POS, identify each port, and load or replace receipt paper.

Written by Euri
Updated over a week ago

Overview

The SUNMI T3 80mm is a desktop Android POS terminal with a 15.6” Full HD touchscreen, built-in 80mm thermal receipt printer, and multiple connectivity options for peripherals and networking. It runs SUNMI OS based on Android 13 and supports USB, Ethernet, cash drawer connectivity, Bluetooth, and Wi-Fi.

Before you begin

Make sure you have:

  • The SUNMI T3 80mm POS

  • Power adapter

  • 80mm thermal receipt paper

  • Any needed accessories or connected peripherals

  • A stable power source

  • Ethernet cable, if using wired internet

Power adapter: AC 100 to 240V input with DC 24V / 2.5A output.

How to turn the terminal on

  1. Connect the power adapter to the terminal’s DC power port.

  2. Plug the adapter into a working outlet.

  3. Press the power button on the terminal.

  4. Wait for the device to boot fully.

If the device does not power on

Try the following:

  1. Confirm the power cable is securely connected at both ends.

  2. Test the outlet with another device.

  3. Check whether the power indicator light turns on.

  4. Disconnect power for a few seconds, reconnect it, and try again.

  5. Inspect the adapter and cable for damage.

If the POS still does not power on, escalate as a hardware issue and collect:

  • Device serial number

  • Store name and location

  • Photo of the power connection

  • Photo or video showing no power response

How to turn the POS off

  1. Press and hold the power button.

  2. Follow the on-screen shutdown prompt, if shown.

  3. Wait for the display to turn off fully before disconnecting power.

Port guide

The SUNMI T3 80mm includes the following ports and connections: 3 x USB 2.0 Type-A, 1 x USB 3.0 Type-A, 1 x USB Type-C, 2 x Micro USB, 1 x Micro-USB debug, 1 x RJ45, 1 x RJ11, 1 x RJ12, and 1 x DC power port.

What each port is for:


USB Type-C port (1)

Used for supported USB-C accessories or connectivity, depending on the deployment.

DC power port (2)

Used to power the terminal.

RJ11 (3)

Used for a cash drawer connection.

USB Type-A ports (4)

Used for supported accessories such as:

  • Keyboard

  • Mouse

  • Scanner

  • Payment accessories

  • Other approved USB peripherals

The terminal includes three USB 2.0 Type-A ports and one USB 3.0 Type-A port.

RJ45 (5)

Used for wired Ethernet/network connection.

Micro-USB debug port (6)

This is a service/debug port. It should generally not be used for normal day-to-day store connections unless specifically directed by hardware or engineering teams.

Printer overview

The SUNMI T3 80mm includes a built-in 80mm thermal printer with:

  • Auto cutter

  • Print speed up to 250 mm/s

  • Support for 80mm paper rolls

  • Paper roll outer diameter up to 80mm

How to load receipt paper

  1. Open the printer compartment.

  2. Insert a new 80mm thermal paper roll.

  3. Make sure the paper is feeding in the correct direction.

  4. Pull a small amount of paper out past the edge of the printer.

  5. Close the printer cover securely.

  6. Run a test print from the terminal or connected POS workflow.

If the receipt prints blank

This is usually caused by the paper being loaded backward. Thermal paper only prints on one side.

To fix:

  1. Open the printer compartment.

  2. Remove the roll.

  3. Flip the roll orientation.

  4. Reload and test again.

How to replace the receipt paper roll

Replace the paper roll when:

  • The terminal is out of paper

  • Receipts are becoming faint

  • The printer is feeding poorly because the roll is nearly empty

Steps:

  1. Open the printer compartment.

  2. Remove the old or empty roll.

  3. Clear any loose scraps of paper.

  4. Insert a new 80mm thermal roll.

  5. Pull a short section of paper outward.

  6. Close the cover fully.

  7. Test print.

How to clear a paper jam

  1. Open the printer compartment.

  2. Remove the paper roll.

  3. Carefully remove any torn or jammed paper from the feed path.

  4. Reload the roll correctly.

  5. Close the cover securely.

  6. Test print again.
    ​

If the paper continues jamming after reload:

  • Check for torn scraps near the cutter

  • Confirm the roll is the correct width

  • Escalate if the cutter or feed path appears damaged

The T3 80mm printer includes an auto cutter, so recurring jams may also indicate cutter-related hardware wear or obstruction.

Connectivity reference

The SUNMI T3 80mm supports:

  • Ethernet via RJ45

  • Wi-Fi 2.4GHz and 5GHz

  • Bluetooth 5.0 / BLE

  • Optional SIM / 4G support on supported variants

Common issues and what to check

POS will not power on

Check:

  • Outlet works

  • Power adapter is fully seated

  • Cable is not damaged

  • Indicator light comes on

Printer is not printing

Check:

  • Paper is loaded

  • Paper is loaded correctly

  • Printer cover is fully closed

  • Roll is not jammed

  • Device is fully powered on

Printer feeds paper but prints blank

Check:

  • Roll orientation is correct

  • Paper is thermal receipt paper

Paper jams repeatedly

Check:

  • Paper is not torn or wrinkled

  • Roll width is correct

  • No scraps are stuck near the cutter

Peripheral is not recognized

Check:

  • Accessory is connected to the correct port

  • Cable is fully seated

  • USB accessory is supported

  • Ethernet is connected to RJ45, not another modular port

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