1. Introduction
The Logitech Wireless Touch Keyboard K400 is designed for comfortable control of your TV-connected computer. It features a full-size keyboard layout and a large, integrated multi-touch touchpad, providing a seamless navigation experience from your couch. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your keyboard.
Image: Angled view of the Logitech Wireless Touch Keyboard K400, highlighting its compact design with a full keyboard and a large, integrated multi-touch touchpad on the right side.
2. Setup
2.1 Package Contents
- Logitech Wireless Touch Keyboard K400
- Logitech Unifying receiver
- 2 AA batteries (pre-installed)
- User documentation
2.2 Battery Installation
The keyboard comes with two AA batteries pre-installed. If you need to replace them:
- Locate the battery compartment cover on the underside of the keyboard.
- Slide the cover off.
- Insert two new AA batteries, ensuring correct polarity (+/-).
- Replace the battery compartment cover.
2.3 Connecting the Unifying Receiver
The Logitech Unifying receiver provides a reliable 2.4 GHz wireless connection.
- Locate the tiny Logitech Unifying receiver, typically stored inside the battery compartment or packaged separately.
- Plug the Unifying receiver into an available USB port on your computer or TV-connected device.
- The keyboard should automatically connect. If not, press any key to wake it up.
Image: Top-down view of the Logitech Wireless Touch Keyboard K400, providing a clear perspective of the keyboard layout and the integrated touchpad.
2.4 System Requirements
The Logitech Wireless Touch Keyboard K400 is compatible with the following operating systems:
- Windows XP
- Windows Vista
- Windows 7
- Windows 8
3. Operating Instructions
3.1 Keyboard Functions
The keyboard features quiet, low-profile keys for comfortable typing. It includes dedicated hotkeys and media keys for quick access to common functions.
- Volume Controls: Dedicated keys for volume up, volume down, and mute are located above the function keys.
- Media Playback: Control media playback with dedicated keys for play/pause, previous track, and next track.
- Windows Hotkeys: Access Windows-specific functions with dedicated keys.
3.2 Touchpad Usage
The large 3.5-inch multi-touch touchpad allows for intuitive navigation.
Image: A diagram illustrating various touchpad gestures, including single-finger pointing, two-finger vertical/horizontal scrolling, and Windows 8 edge gestures for enhanced navigation.
- Pointing: Touch and slide one finger anywhere on the touchpad to move the onscreen pointer for quick navigation and precise cursor control.
- Scrolling: Drag two fingers up or down to easily scroll through web pages, documents, or lists.
- Clicking: Use the integrated left and right click buttons below the touchpad, or tap the touchpad surface for a left click.
- Windows 8 Gesture Support: The keyboard supports one-touch Windows 8 shortcut keys. For example, swipe one finger from the left edge of the touchpad to switch applications, or from the right edge to bring up Windows 8 Charms.
Image: A person comfortably using the Logitech Wireless Touch Keyboard K400 from a couch, demonstrating its utility for controlling a laptop connected to a television, ideal for home entertainment setups.
4. Maintenance
4.1 Cleaning the Keyboard
To maintain the performance and appearance of your keyboard:
- Use a soft, lint-free cloth slightly dampened with water or a mild cleaning solution.
- Avoid using abrasive cleaners, solvents, or aerosol sprays directly on the keyboard.
- For dust and debris between keys, use compressed air.
4.2 Battery Life
The keyboard is designed for extended battery life. When the battery indicator light turns red, it's time to replace the batteries. Refer to section 2.2 for battery replacement instructions.
5. Troubleshooting
5.1 No Connection or Intermittent Connection
- Check Batteries: Ensure batteries are correctly installed and have sufficient charge. Replace if necessary.
- Receiver Connection: Make sure the Unifying receiver is securely plugged into a working USB port. Try a different USB port.
- Distance and Obstacles: Ensure the keyboard is within the 10-meter (33 feet) wireless range and there are no large metal objects between the keyboard and the receiver that could interfere with the signal.
- Re-pair Device: If issues persist, you may need to re-pair the keyboard with the Unifying receiver using Logitech's Unifying software (available for download from Logitech's official website).
5.2 Touchpad Not Responding
- Clean Touchpad: Ensure the touchpad surface is clean and free of dirt or moisture.
- Driver Issues: Ensure your operating system's drivers are up to date. Visit Logitech's support website for the latest drivers.
5.3 Keys Not Working
- Check Connection: Verify the wireless connection as described in section 5.1.
- Clean Keys: Ensure no debris is lodged under the keys.
6. Specifications
| Brand | Logitech |
| Model Number | 920-003070 (K400) |
| Connectivity Technology | Wireless (2.4 GHz radio frequency) |
| Wireless Range | Up to 10 meters (33 feet) |
| Integrated Touchpad | 3.5-inch multi-touch touchpad |
| Power Source | 2 AA Alkaline batteries |
| Compatible Operating Systems | Windows XP, Windows Vista, Windows 7, Windows 8 |
| Dimensions (L x W x H) | 35.31 x 13.59 x 2.39 cm (13.9 x 5.35 x 0.94 inches) |
| Weight | 360.04 g (0.79 lbs) |
| Material | Plastic |
7. Warranty and Support
7.1 Warranty Information
Logitech products are manufactured to the highest quality standards. For detailed warranty information, please refer to the warranty card included with your product or visit the official Logitech website.
7.2 Customer Support
If you encounter any issues not covered in this manual or require further assistance, please visit the official Logitech support website at support.logi.com. You can find FAQs, troubleshooting guides, and contact information for technical support.
