Introduction
This manual provides detailed instructions for the Keychron K4 Pro Custom Wireless Mechanical Keyboard. The K4 Pro is a 96% layout keyboard featuring QMK/VIA programmability, hot-swappable switches, and RGB backlighting, designed for compatibility with macOS, Windows, and Linux operating systems. Please read this manual thoroughly to ensure proper setup and operation of your keyboard.
Image: Keychron K4 Pro Custom Wireless Mechanical Keyboard. This image displays the full keyboard layout, highlighting the brown switches and keycap design.
Setup
1. Package Contents
Before proceeding, verify that all items are present in the package:
- 1x Fully Assembled Keyboard (Keychron K4 Pro)
- 1x Set of Keycaps (Double-Shot PBT, for Windows and macOS)
- 1x Set of Switches (Keychron K Pro Brown Switch)
- 1x PCB (Pre-installed)
- 1x Steel Plate (Pre-installed)
- 1x Sound Absorbing Foam (Pre-installed)
- 1x Silicone Bottom Pad (Pre-installed)
- 6 Sets of Stabilizers (PCB Screw-In, Pre-installed)
- 1x Type-A to Type-C Cable
- 1x Switch Puller
- 1x Keycap Puller
- 1x Screwdriver
Image: Keychron K4 Pro Fully Assembled Version. This image illustrates the keyboard and all components included in the package, such as the USB cable, keycap puller, and switch puller.
2. Connectivity
The Keychron K4 Pro supports both wireless Bluetooth and wired USB Type-C connections.
- Wired Mode: Connect the keyboard to your device using the provided USB Type-C cable. The keyboard will automatically switch to wired mode.
- Bluetooth Mode: To connect wirelessly, ensure the keyboard's mode switch (located on the back or side) is set to Bluetooth. Press and hold Fn + 1 (or Fn + 2, Fn + 3) for 4 seconds to enter pairing mode. The backlight will flash rapidly. On your device, search for "Keychron K4 Pro" in Bluetooth settings and connect. The keyboard can connect to up to three devices.
Image: Keyboard connected to multiple devices. This image shows the Keychron K4 Pro keyboard wirelessly connected to a laptop, tablet, and smartphone, demonstrating its multi-device Bluetooth capability.
3. Operating System Compatibility
The K4 Pro is compatible with macOS, Windows, and Linux. Use the OS switch on the keyboard to select the appropriate operating system mode for optimal key functionality.
4. Ergonomic Support
The keyboard features three levels of adjustable typing angles (3°, 7°, and 10°) to provide ergonomic support. Adjust the feet on the underside of the keyboard to your preferred angle.
Image: Adjustable ergonomic support. This image highlights the adjustable feet on the underside of the keyboard, allowing for 3°, 7°, and 10° typing angles.
Operating Instructions
1. QMK/VIA Programmability
The K4 Pro supports full QMK and VIA programmability, allowing you to remap keys, create macros, and customize keyboard layouts. Connect the keyboard to your computer via USB and use the VIA software to access these features. The VIA software can be downloaded from the Keychron official website.
Image: Program with QMK & VIA. This image displays the VIA software interface, showing how users can remap keys and create macros for the Keychron K4 Pro.
2. Hot-swappable Switches
The K4 Pro features hot-swappable sockets, enabling you to change switches without soldering. The PCB is compatible with most 3-pin and 5-pin MX-style mechanical switches. Use the included switch puller to carefully remove and install switches.
Image: Hot-swappable switches. This close-up image shows the hot-swappable sockets on the keyboard's PCB with switches installed and removed, illustrating the ease of switch replacement.
3. RGB Backlight Settings
The keyboard offers over 22 types of RGB backlight settings. You can adjust the RGB hue, saturation, brightness, and effect speed directly from the keyboard using key combinations (refer to the keyboard's quick start guide for specific key commands) or through the VIA software.
Image: 22 types of RGB Backlight. This image shows a close-up of the keyboard's keys illuminated with vibrant RGB backlighting, demonstrating the various lighting effects.
4. Internal Construction and Stabilizers
The K4 Pro is engineered with multiple layers including sound-absorbing foam, a silicone dampening bottom pad, and a steel plate to provide a responsive and quiet typing experience. The large keys (space bar, Shift, Enter, Delete) utilize screw-in PCB stabilizers for enhanced stability and smoother actuation. The keyboard supports third-party stabilizers like Cherry or Durock.
Image: Exploded view of keyboard layers. This image illustrates the internal construction of the Keychron K4 Pro, showing the keycaps, switches, frame, sound-absorbing foam, plate, PCB, silicone bottom pad, and bottom case.
Maintenance
1. Cleaning
To clean your keyboard, disconnect it from power. Use a soft, dry cloth to wipe the keycaps and frame. For deeper cleaning, remove keycaps using the included keycap puller and use compressed air to clear debris from between switches. Avoid using harsh chemicals or abrasive materials.
2. Switch Replacement
To replace a switch, gently pull off the keycap using the keycap puller. Then, use the switch puller to carefully grip and extract the switch from its socket. Align the pins of the new switch with the holes on the PCB and press firmly until it clicks into place. Ensure the pins are not bent before insertion.
Troubleshooting
If you encounter issues with your Keychron K4 Pro, refer to the following common troubleshooting steps:
- Keyboard Not Responding: Ensure the keyboard is properly connected via USB or successfully paired via Bluetooth. Check the OS switch position.
- Bluetooth Connectivity Issues: Try re-pairing the keyboard with your device. Ensure no other strong wireless signals are interfering. Fully charge the keyboard.
- Keys Not Registering: If a specific key is not working, it might be a faulty switch. Since the keyboard is hot-swappable, try replacing the switch with a spare one or swapping it with a less frequently used key to diagnose.
- Backlight Not Working: Check backlight settings using key combinations or VIA software. Ensure the keyboard is sufficiently charged if in wireless mode.
- Firmware Update: Visit the Keychron official website for the latest firmware updates and instructions, which can resolve various performance issues.
For further assistance, please contact Keychron customer support.
Specifications
| Feature | Detail |
|---|---|
| Model Number | Keychron K4P-H3 |
| Connectivity | Bluetooth, USB Type-C |
| Layout | 96% Layout, 100 Keys |
| Switches | Keychron K Pro Brown (Hot-swappable) |
| Keycaps | OSA Profile Double-shot PBT |
| Backlighting | RGB (22+ types) |
| Compatible Devices | PC (macOS, Windows, Linux) |
| Ergonomic Features | Three levels of adjustable typing angle (3°, 7°, 10°) |
| Material | Silicone, Steel |
| Item Weight | 3.79 pounds |
| Package Dimensions | 18.5 x 7 x 2 inches |
| Batteries | 1 Lithium Polymer battery (included) |
Image: Keychron K Pro Switch Features. This table provides detailed specifications for the Keychron K Pro Brown switches, including operating force, pre-travel, travel distance, behavior (tactile), pre-lubed status, sound level (gentle), and suitability (midway office/gaming).
Warranty and Support
Keychron provides a limited warranty for its products. For detailed warranty information, product registration, and technical support, please visit the official Keychron website. You can also find FAQs and additional resources there.
Official Website: www.keychron.com
