YUNZII B75 PRO Wireless Mechanical Keyboard User Manual

1. Introduction

The YUNZII B75 PRO is a 75% layout wireless mechanical keyboard designed for enhanced typing and gaming experiences. It features a gasket-mounted structure, hot-swappable switches, multi-mode connectivity, and customizable RGB backlighting. This manual provides detailed instructions for setup, operation, maintenance, and troubleshooting to ensure optimal use of your keyboard.

Figure 1: YUNZII B75 PRO Wireless Mechanical Keyboard (Pink)

2. Package Contents

Please verify that all items are present in your package:

• YUNZII B75 PRO Keyboard x1
• USB Cable (Type-C) x1
• Switch and Keycap Puller x1
• Function Card & User Manual x1
• 2.4G Dongle x1
• Dust Cover x1
• Extra Keycaps and Switches

Figure 2: Package Contents of the YUNZII B75 PRO

3. Setup

3.1 Connectivity Modes

The B75 PRO supports three connection modes: Bluetooth, 2.4GHz Wireless, and Wired (USB Type-C).

• Wired Mode: Connect the keyboard directly to your device using the provided USB Type-C cable.
• 2.4GHz Wireless Mode: Insert the 2.4G dongle into your device's USB port. Switch the keyboard to 2.4G mode using the switch on the side.
• Bluetooth Mode: Switch the keyboard to BT mode. On your device, search for available Bluetooth devices and select 'YUNZII B75 PRO' to pair.

Figure 3: Three Connection Modes

3.2 Battery Information

The keyboard is equipped with a built-in 4000mAh high-capacity battery, providing extended usage in wireless modes. To check the battery level in wireless mode, press Fn + Ctrl.

Figure 4: Battery Level Indicator

3.3 Compatibility

The YUNZII B75 PRO is compatible with both Windows and macOS operating systems. Switch between modes using Fn+A for Windows and Fn+S for Mac.

Figure 5: Operating System Compatibility

4. Operating Instructions

4.1 Key Layout and Multimedia Knob

The B75 PRO features a 75% layout with 82 keycaps and a multi-function knob. This compact design includes number keys, function keys, and arrow keys. The knob allows for quick adjustments:

• Long Press: Switch between Multimedia Mode and RGB Mode.
• Rotate in Multimedia Mode: Adjust volume (clockwise for volume up, counter-clockwise for volume down).
• Short Press in Multimedia Mode: Mute/unmute volume.
• Rotate in RGB Mode: Adjust RGB backlight brightness.
• Short Press in RGB Mode: Change RGB effect.

Figure 6: Multimedia Knob Functions

4.2 RGB Backlighting

The keyboard features 16.8 million RGB backlighting with over 20 built-in modes and south-facing LEDs. You can customize the lighting effects using the following key combinations:

• Fn + End: Change backlight color.
• Fn + Insert: Change backlight effect.

Figure 7: RGB Backlight Controls

4.3 Programmable Software

The B75 PRO supports programmable web software for Windows and Mac systems, allowing you to:

• Remap keys for improved efficiency.
• Edit macros to combine multiple shortcuts into one keystroke.
• Customize RGB lighting effects.

Figure 8: Programmable Software Features

4.4 FN Key Combinations (Windows Quick Start)

Utilize the Function (Fn) key for quick access to various commands:

Figure 9: FN Key Functions

5. Maintenance

5.1 Hot-Swappable Switches

The B75 PRO features hot-swappable sockets compatible with 3-pin/5-pin mechanical switches, allowing you to easily change switches without soldering. Use the provided switch puller to remove and install switches.

Figure 10: Hot-Swappable Switches

5.2 Cleaning

To clean your keyboard, gently wipe the keycaps and chassis with a soft, damp cloth. For deeper cleaning, remove keycaps using the keycap puller and clean the switches and plate with compressed air or a soft brush. Ensure the keyboard is powered off and disconnected before cleaning.

6. Troubleshooting

Here are solutions to common issues you might encounter:

• Q1: Why is the keyboard Red light flashing below the spacebar?
  A: When the battery is lower than 15%, the Spacebar will flash red slowly. When charging, the Spacebar will stay green. After charging is complete, the Spacebar restores to the normal RGB mode.
• Q2: The keyboard doesn't work and doesn't charge.
  A: Please download the firmware (link not provided, refer to manufacturer's website) and try updating it. Stop the software from running in the background and then update the firmware. Try it in wired mode.
• Q3: The Win button doesn't work.
  A: Please try pressing Fn+WIN to unlock it. This should resolve the issue you are experiencing with the WIN key not working.
• Q4: How to solve the problem of the spacebar key being stuck and not working?
  A: Please follow these steps to reset the spacebar stabilizer:
  1. Remove Keycap: Use the keycap puller to gently pull the spacebar keycap.
  2. Remove Stabilizer: Locate the stabilizer inside the plastic housings. Carefully unclip both ends of the stabilizer and lift it out.
  3. Reinstall Stabilizer: Place the stabilizer back into the housings, ensuring both ends snap securely into the clips.
  4. Reattach Keycap.
  5. Test: Press the spacebar to check if it moves smoothly.

Figure 11: Common Troubleshooting Steps

7. Specifications

Figure 12: Milk Linear Switch Specifications

8. Warranty and Support

For warranty information and customer support, please refer to the official YUNZII website or contact the seller directly through the platform where the product was purchased. Keep your purchase receipt for warranty claims.

Figure 13: Customer Support Information

9. Product Videos

Watch these official product videos for additional information and demonstrations: