Keychron K2 Max QMK/VIA Wireless Mechanical Keyboard User Manual

Introduction

The Keychron K2 Max is a versatile 75% layout mechanical keyboard designed for seamless integration across multiple operating systems and connectivity options. It supports 2.4 GHz wireless, Bluetooth 5.1, and Type-C wired connections, offering a 1000Hz polling rate in 2.4G and wired modes for optimal performance in both gaming and professional environments. This manual provides detailed instructions for setting up, operating, maintaining, and troubleshooting your K2 Max keyboard.

Keychron K2 Max keyboard with a single banana switch shown above it. — The Keychron K2 Max 75% layout mechanical keyboard, featuring a compact design and a sample of the Keychron Super Banana switch.

Setup

Package Contents

Before you begin, ensure all components are present in your package:

1x Fully Assembled Keyboard
1x Keycap & Switch Puller
1x Screwdriver
1x Type-A 2.4GHz Receiver
1x Extension Adapter For Receiver
1x Type-A to Type-C Cable
Extra keycaps for Windows layout

Diagram showing the contents of the Keychron K2 Max Fully Assembled Version package, including the keyboard, tools, receiver, and cable. — Illustration of the items included with the Keychron K2 Max Fully Assembled Version.

Initial Charging

The keyboard comes with a built-in 4000mAh rechargeable battery. For optimal performance, it is recommended to fully charge the keyboard before first use. Connect the provided Type-A to Type-C cable to the keyboard's USB-C port and a power source (e.g., computer USB port or wall adapter).

Connectivity Options

The K2 Max offers three connection modes:

2.4 GHz Wireless: For a stable and fast connection, ideal for gaming. Insert the 2.4GHz receiver into a USB port on your device. The receiver can be stored in a dedicated slot on the keyboard's underside when not in use.
Bluetooth 5.1: For wireless convenience with up to 3 devices. Pair the keyboard with your laptop, tablet, or smartphone.
Type-C Wired: For a direct and reliable connection, also allowing charging.

Close-up of the Keychron K2 Max keyboard's underside, showing the storage slot for the 2.4 GHz wireless dongle. — The 2.4 GHz wireless dongle can be conveniently stored in a dedicated slot on the keyboard's underside.

Keychron K2 Max keyboard connected wirelessly to a smartphone, tablet, and laptop, illustrating its tri-mode connectivity. — The Keychron K2 Max supports Bluetooth 5.1, 2.4 GHz Wireless, and Type-C Wired connections for versatile use across multiple devices.

Operating Instructions

Switching Operating Systems

The K2 Max is optimized for both macOS and Windows. Use the dedicated toggle switch on the keyboard to switch between macOS and Windows layouts. Extra keycaps for Windows are included to match the layout.

The K2 Max is compatible with both Mac and Windows operating systems, and includes additional keycaps for Windows users.

QMK/VIA Customization

The keyboard supports QMK open-source firmware, allowing extensive customization of key remapping, macros, and shortcuts. Access the Keychron Launcher web app for configuration without requiring any software installation.

Screenshot of the Keychron Launcher Web App interface, showing options for keymap, lighting, macro, firmware update, and key test. — Customize your Keychron K2 Max using the Keychron Launcher Web App, which requires no installation.

Backlight Control

The K2 Max features South-Facing RGB Backlight. Use the dedicated function keys to cycle through various lighting effects, adjust brightness, and change colors. Refer to the keyboard's quick start guide for specific key combinations.

Battery Life Management

The 4000mAh battery provides long-lasting performance. With the backlight off, the keyboard can last up to 190 hours. At the lowest brightness setting, it can provide approximately 100 hours of continuous use. Recharge the keyboard when the battery indicator shows low power.

Infographic illustrating the battery life of the Keychron K2 Max, showing 190 hours with backlight off and 100 hours with backlight on (lowest brightness), powered by a 4000mAh battery. — The Keychron K2 Max features a 4000mAh battery, offering extended usage times.

Maintenance

Cleaning the Keyboard

To clean your keyboard, first disconnect it from all power sources. Use a soft, lint-free cloth slightly dampened with water or a mild cleaning solution. For cleaning between keycaps, use compressed air or a small brush. Avoid spraying liquids directly onto the keyboard.

Keycap and Switch Replacement

The Keychron K2 Max features hot-swappable switches, allowing you to change switches without soldering. Use the provided keycap and switch puller tools for safe removal and installation.

Removing Keycaps: Gently pull the keycap straight up using the keycap puller.
Removing Switches: Insert the switch puller's prongs under the top and bottom clips of the switch and gently rock it while pulling upwards.
Installing Switches: Align the pins of the new switch with the holes on the PCB and press down firmly until it clicks into place. Ensure pins are not bent.
Installing Keycaps: Align the keycap with the switch stem and press down firmly.

Close-up view of several mechanical keyboard switches with RGB lighting, showing their clear housing and yellow stems. — A close-up of the mechanical switches, illustrating their design and the RGB lighting capabilities.

Diagram explaining 'What is Double-shot?', showing a keycap composed of two plastic injections: the main housing and the legend. — Explanation of double-shot keycap construction, which ensures legends do not fade over time.

Image of keyboard stabilizers, which are components used to ensure larger keys press down evenly. — Keyboard stabilizers, essential for consistent keypresses on larger keys like the spacebar and shift keys.

Troubleshooting

Connectivity Issues

2.4 GHz Wireless: Ensure the receiver is securely plugged into a USB port. Try a different USB port. Ensure the keyboard is in 2.4G mode.
Bluetooth: Ensure Bluetooth is enabled on your device. Unpair and re-pair the keyboard if connection is lost. Ensure the keyboard is in Bluetooth mode and selected the correct device slot (BT1, BT2, BT3).
Wired: Check the USB-C cable connection at both ends. Try a different USB-C cable or port.

Keys Not Responding

If a specific key is not responding, it might be a faulty switch. If your model is hot-swappable, try replacing the switch with a spare one or swapping it with a less frequently used key to diagnose.
Ensure the keyboard is not in sleep mode.
Check for any debris under the keycap or switch.

Backlight Issues

If the backlight is off, check if it's disabled or set to the lowest brightness. Adjust using the backlight control keys.
Ensure the keyboard has sufficient battery charge.

Charging Issues

Ensure the charging cable is properly connected.
Try a different USB port or power adapter.
Allow the keyboard to charge for a few hours.

Specifications

Model Name	K2M-B4
Connectivity Technology	2.4G Wireless, Bluetooth 5.1, Type-C Wired
Keyboard Description	Mechanical
Special Feature	Backlit (South-Facing RGB)
Color	Keychron Super Banana Switch (Black keyboard chassis)
Compatible Devices	Gaming Console, Laptop, PC (Mac/Windows/Linux)
Battery	4000mAh Lithium Polymer (included)
Item Weight	3.08 pounds
Package Dimensions	15.27 x 6.42 x 2.24 inches
Manufacturer	Keychron

Exploded diagram of the Keychron K2 Max keyboard layers, showing keycaps, switches, plate, sound absorbing foam, IXPE foam, PET film, PCB, EPDM foam, bottom case PET film, silicone bottom pad, battery, and bottom case. — Detailed internal structure of the Keychron K2 Max, highlighting its enhanced acoustic foams and layered design for a premium typing experience.

Warranty and Support

For warranty information, technical support, or further assistance, please visit the official Keychron website or their Amazon store. Keychron offers various protection plans for extended coverage.

Visit the Keychron Store on Amazon for more products and support resources.

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Keychron K2M-B4