EPOMAKER RT85 Wireless Mechanical Keyboard User Manual

1. Introduction

The EPOMAKER RT85 is a 75% layout wireless mechanical keyboard designed for versatility and performance. It features a unique DIY screen and a multi-functional joystick, offering extensive customization and control. The keyboard is built with a durable retro-inspired design, high-capacity battery, and advanced sound-dampening gasket structure for a premium typing experience.

Figure 1: EPOMAKER RT85 Wireless Mechanical Keyboard overview with key features.

2. Package Contents

Please ensure all items are present in the package:

• EPOMAKER RT85 Mechanical Keyboard
• USB Cable
• Keycap Puller
• User Manual
• Extra Switches (if included with your specific model)

Figure 2: Contents included in the EPOMAKER RT85 package.

3. Setup

3.1 Connectivity Modes

The RT85 keyboard supports three connection modes: Wired (USB-C), 2.4GHz Wireless, and Bluetooth (BT).

• Wired Mode: Connect the keyboard directly to your device using the provided USB-C cable. This mode offers stable connection and 1000Hz polling rate.
• 2.4GHz Wireless Mode: Insert the 2.4GHz USB dongle into your device. Switch the keyboard to 2.4GHz mode using the switch on the back or side of the keyboard. This mode provides a 1000Hz polling rate for low-latency gaming.
• Bluetooth Mode: Switch the keyboard to Bluetooth mode. On your device, search for "EPOMAKER RT85" in the Bluetooth settings and pair. The keyboard supports convenient connection to Mac and Android tablets.

Figure 3: Tri-mode connectivity options for the RT85 keyboard.

3.2 Initial Charge

Before first use, it is recommended to fully charge the keyboard using the USB-C cable. The battery indicator on the DIY screen will show charging status.

4. Operating Instructions

4.1 DIY Screen and Joystick Functions

The RT85 features a custom TFT screen and a high-sensitivity joystick for quick adjustments without interrupting your workflow or game.

• Joystick Control: Located next to the arrow keys, the joystick allows for smooth adjustment of game volume and RGB lighting effects.
• Screen Display: The 3-in-1 screen functions as a smartwatch, control panel, and display center. It can show time, battery status, connection mode, and custom pixel art or animated GIFs.
• Customization: Use the programmable software to upload your own pixel art or GIFs to the screen, and customize RGB brightness and colors.

Figure 4: Detailed view of the multi-functional joystick and DIY screen.

4.2 Programmable Software

The RT85 comes with dedicated programming software to personalize your keyboard experience. This software allows you to:

• Key Remapping: Reassign keys to create a personalized layout.
• Macro Recording: Record complex key sequences for one-touch execution, automating repetitive tasks or in-game combos.
• Backlight Control: Adjust RGB backlight effects, brightness, and sensitivity.
• Screen Customization: Upload custom images or GIFs to the DIY screen.

The software can be downloaded from the official EPOMAKER website. Refer to the software's interface for detailed instructions on each function.

Figure 5: Overview of the EPOMAKER RT85 programmable software.

4.3 Hot-Swappable Switches

The RT85 features a hot-swappable PCB, allowing you to easily change mechanical switches without soldering. This enables customization of typing feel and sound.

• To remove a switch, use the provided switch puller to gently grip and pull the switch upwards.
• To install a new switch, align its pins with the holes on the PCB and press down firmly until it clicks into place. Ensure the pins are not bent.

Figure 6: Illustration of the hot-swappable switch feature.

5. Features

5.1 Design and Build

The RT85 boasts a classic retro aesthetic with a durable build. It is available in two color combinations: Army Green with dark grey, or Retro White with grey and vibrant orange accents. The rounded frame, screen, and joystick evoke a classic gaming machine feel, while the south-facing full RGB backlight adds modern functionality. Weighing 1kg, its sturdy construction ensures stability during intense use. Double-shot PBT keycaps resist shine over time, maintaining legibility.

5.2 Battery Life and Polling Rate

Equipped with a large 8000mAh battery, the RT85 offers extended usage:

• Up to 90 hours of continuous use with the screen at maximum brightness.
• Up to 320 hours of continuous use with the screen and lighting off.

Both wired and 2.4GHz wireless modes achieve a 1000Hz polling rate, ensuring immediate and consistent key input response for a smooth typing experience.

Figure 7: Battery performance of the RT85 keyboard.

5.3 Gasket Structure and Sound Profile

The RT85 features a meticulously designed sound-dampening gasket system for a rich, deep "Thocky" typing sound. This system comprises a 5-layer structure:

1. PORON Sandwich Foam
2. IXPE Switch Pad
3. PET Acoustic Enhancement Pad
4. EPDM Switch Socket Foam
5. Silicone Base

These layers work in harmony with pre-lubed linear switches and tuned stabilizers to deliver exceptionally smooth and satisfying keystrokes.

Figure 8: Exploded view of the RT85's 5-layer gasket structure.

5.4 Ergonomics

The RT85 is designed with wrist comfort in mind, promoting comfortable typing, gaming, and creative work. The innovative gasket structure combined with a flex-cut PC plate provides a softer, more cushioned typing feel, significantly reducing hand fatigue during long sessions. Ergonomic Cherry profile keycaps support your fingertips for a natural and comfortable typing posture. Adjustable kickstands offer three angles (5°, 6.7°, 10°) to suit your desk setup and sitting position, ensuring your wrists are always supported at an ideal height.

6. Maintenance

• Cleaning Keycaps: Use a keycap puller to remove keycaps. Clean them with a mild soap solution and a soft brush, then rinse and dry thoroughly before reattaching.
• Cleaning the Case: Wipe the keyboard case with a soft, damp cloth. Avoid harsh chemicals.
• Dust Removal: Use compressed air to remove dust and debris from between the keys.
• Switch Maintenance: If you have hot-swappable switches, you can remove and clean them or replace them if they become faulty.

7. Troubleshooting

• Keyboard not responding: Ensure the keyboard is charged. Check the connection mode (wired, 2.4GHz, or Bluetooth) and ensure it matches your device's connection. Try reconnecting the USB cable or re-pairing Bluetooth.
• Keys not registering: If specific keys are not working, try removing and reinserting the switch for that key (if hot-swappable). Ensure the switch pins are not bent.
• 2.4GHz wireless issues: Ensure the USB dongle is securely plugged in and the keyboard is in 2.4GHz mode. Try moving the dongle to a different USB port or closer to the keyboard to reduce interference.
• Bluetooth pairing issues: Ensure the keyboard is in Bluetooth pairing mode. Remove any previous pairings of the keyboard from your device's Bluetooth settings and try pairing again.
• DIY screen display issues: If the screen displays incorrectly or is blank, ensure the keyboard firmware and software are up to date. A user review mentioned that installing the driver fixed a misaligned time display.
• Software not detecting keyboard: Ensure the keyboard is connected via USB-C when attempting to use the programming software. Download the latest software version from the EPOMAKER website.

8. Specifications

9. Warranty and Support

The EPOMAKER RT85 keyboard comes with a 1-year manufacturer's warranty. For technical support, warranty claims, or further assistance, please visit the official EPOMAKER website or contact their customer service directly.

Official Website: www.epomaker.com