Introduction
The YUNZII QL75 is a versatile wireless mechanical keyboard designed with a retro typewriter aesthetic. It offers multiple connectivity options, including Bluetooth, 2.4GHz wireless, and wired USB-C, making it compatible with a wide range of devices and operating systems. This keyboard features hot-swappable switches, durable PBT keycaps, and a built-in stand for enhanced ergonomics and multi-device use.
Image: Overview of the YUNZII QL75 keyboard highlighting its key features such as tri-mode connectivity, hot-swappable design, built-in stand, 4000 mAh battery, RGB backlighting, removable keycaps, 75% layout, multifunction knobs, clicky typing sound, and QMK/VIA programmability. Dimensions are 12.92 x 8.44 x 2.52 inches, weighing 3.22 lbs.
Setup
Package Contents
Before proceeding, ensure all components are present:
- YUNZII QL75 Mechanical Keyboard
- USB-C Cable
- 2.4GHz Wireless Receiver (USB dongle)
- Keycap Puller
- Switch Puller
- User Manual (this document)
Charging the Keyboard
Connect the provided USB-C cable to the keyboard's USB-C port and the other end to a power source (e.g., computer USB port, wall adapter). The keyboard features a built-in 4000 mAh battery. An indicator light will show charging status, typically turning off or changing color when fully charged.
Connectivity Options
The QL75 keyboard supports three connection modes: wired USB-C, 2.4GHz wireless, and Bluetooth 5.0. Use the mode switch located on the keyboard to select your preferred connection type.
Image: Visual representation of the YUNZII QL75 keyboard demonstrating its tri-mode connection capabilities: Bluetooth, 2.4GHz Wireless, and Type-C wired. The image shows the keyboard connected to a monitor and a tablet, illustrating its versatility.
1. Wired Connection (USB-C)
- Ensure the mode switch on the keyboard is set to the wired (USB-C) position.
- Connect the USB-C cable from the keyboard to your computer's USB port.
- The keyboard will be automatically recognized and ready for use.
2. 2.4GHz Wireless Connection
- Set the mode switch on the keyboard to the 2.4GHz wireless position.
- Insert the 2.4GHz USB receiver into an available USB port on your computer.
- The keyboard should connect automatically. If not, press Fn + 4 to initiate pairing.
3. Bluetooth Connection
The QL75 can connect to up to 3 Bluetooth devices. Use Fn + 1, Fn + 2, or Fn + 3 to select a Bluetooth channel.
- Set the mode switch on the keyboard to the Bluetooth position.
- Press and hold Fn + 1 (or Fn + 2 / Fn + 3) for 3-5 seconds until the indicator light flashes rapidly, indicating pairing mode.
- On your device (computer, tablet, smartphone), open Bluetooth settings and search for new devices.
- Select "YUNZII QL75" from the list of available devices to pair.
- Once paired, the indicator light will stop flashing.
Video: A comprehensive overview and setup guide for the YUNZII QL75 keyboard, demonstrating its features and initial connection processes across different modes.
Operating Instructions
Switching Connection Modes
Use the physical switch on the keyboard to toggle between Wired, 2.4GHz Wireless, and Bluetooth modes. Ensure the switch is firmly set to the desired mode.
Multi-Device Switching (Bluetooth)
The QL75 allows seamless switching between up to 3 paired Bluetooth devices and 1 2.4GHz wireless device, plus the wired connection. To switch between paired Bluetooth devices, simply press Fn + 1, Fn + 2, or Fn + 3 corresponding to the device's channel. To switch to 2.4GHz wireless, press Fn + 4. For wired mode, ensure the physical switch is set to wired.
Image: The YUNZII QL75 keyboard shown in a multi-device setup, illustrating its compatibility with various operating systems like Android, iOS, macOS, and Windows, and its ability to connect to phones, tablets, and PCs. It highlights the ease of switching between up to 5 devices.
RGB Backlight Control
The keyboard features customizable RGB backlighting. Use the following key combinations to control the lighting effects:
- Fn + \|: Cycle through backlight modes.
- Fn + [ {: Decrease backlight brightness.
- Fn + ] }: Increase backlight brightness.
- Fn + ; :: Decrease backlight speed.
- Fn + ' ": Increase backlight speed.
QMK/VIA Programmability
The YUNZII QL75 supports QMK/VIA firmware, allowing for advanced key remapping, macro creation, and custom layer configurations. To utilize QMK/VIA, download the appropriate software from the official YUNZII website or the QMK/VIA community resources. Connect the keyboard in wired mode for programming.
Using the Built-in Stand
The keyboard includes a built-in stand designed to hold tablets or smartphones, providing an ergonomic setup for multi-device workflows. Simply pull up the stand located at the top of the keyboard to secure your device.
Image: The YUNZII QL75 keyboard with a tablet securely placed in its integrated stand, demonstrating its ergonomic design for multi-device use and enhanced productivity.
Video: A demonstration of the YUNZII QL75 keyboard's features, potentially including its multi-device switching, RGB lighting, or the use of its built-in stand.
Maintenance
Cleaning the Keyboard
To maintain optimal performance and appearance, regularly clean your keyboard:
- Disconnect the keyboard from all power sources and devices.
- Use a soft brush or compressed air to remove dust and debris from between the keycaps.
- For keycap cleaning, use a damp cloth with a mild cleaning solution. Avoid harsh chemicals.
- The PBT keycaps are durable and resistant to oil and fading due to dye-sublimation technology.
Image: Close-up view of the YUNZII QL75's PBT keycaps, highlighting the dye-sublimation process which ensures anti-oil and non-fading legends for enhanced durability and aesthetic retention.
Hot-Swapping Switches
The QL75 is a hot-swappable mechanical keyboard, allowing you to change switches without soldering. It is compatible with 3-pin and 5-pin MX-style switches.
- Using the provided keycap puller, carefully remove the desired keycap.
- Using the provided switch puller, gently grip the top and bottom clips of the switch and pull it straight up.
- Align the pins of the new switch with the holes on the PCB. Ensure the pins are straight.
- Press the new switch firmly into place until it clicks. Do not force it if resistance is met; check pin alignment.
- Replace the keycap.
Keycap Replacement
The keyboard comes with durable PBT keycaps. You can replace them with other compatible keycap sets to customize the keyboard's appearance.
Image: A full set of Spring Tea themed keycaps, demonstrating the aesthetic customization options available for the YUNZII QL75 keyboard.
To replace keycaps:
- Use the keycap puller to carefully remove the existing keycap by hooking it onto the keycap and pulling straight up.
- Align the new keycap with the switch stem and press down gently until it is securely seated.
Troubleshooting
Connection Issues
- Wired: Ensure the USB-C cable is securely connected to both the keyboard and the computer. Try a different USB port or cable.
- 2.4GHz Wireless: Ensure the 2.4GHz receiver is properly inserted and the keyboard mode switch is set to 2.4GHz. Re-pair by pressing Fn + 4.
- Bluetooth: Ensure the keyboard is in pairing mode (flashing indicator light) and your device's Bluetooth is enabled. Forget the device on your computer/phone and try pairing again. Ensure the correct Bluetooth channel (Fn+1/2/3) is selected.
- All Modes: Check the keyboard's battery level. A low battery can cause connection instability.
Keys Not Responding
- Ensure the keyboard is properly connected and powered on.
- If a specific key is not working, carefully remove its keycap and switch. Re-seat the switch firmly or try a different switch in that position to determine if the issue is with the switch or the PCB.
- Perform a factory reset if available (refer to QMK/VIA documentation for specific key combinations).
Charging Problems
- Verify the USB-C cable is functional and securely connected.
- Try a different USB power adapter or computer USB port.
- Ensure the charging indicator light is active when connected.
Specifications
| Model | YUNZII QL75 |
| Connectivity | USB-C Wired, 2.4GHz Wireless, Bluetooth 5.0 |
| Battery Capacity | 4000 mAh |
| Keycap Material | Dye-Sublimated PBT |
| Switch Compatibility | 3-pin/5-pin MX-style mechanical switches (Hot-swappable) |
| Layout | 75% |
| Backlighting | RGB |
| Programmability | QMK/VIA |
| Compatibility | Windows, macOS, Android, iOS |
| Dimensions | 12.92 x 8.44 x 2.52 inches |
| Weight | 3.22 lbs |
Warranty and Support
YUNZII products are covered by a limited warranty against manufacturing defects. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official YUNZII website.
For technical support, troubleshooting assistance, or any inquiries regarding your YUNZII QL75 keyboard, please contact YUNZII customer service through their official website or the retailer where the product was purchased. Please have your product model and purchase information ready when contacting support.
