If the Logitech Unify receiver cannot detect the keyboard, first try the following steps to troubleshoot the problem: 1. Make sure the receiver and the device are normal, replace the USB interface, test the receiver's compatibility on other computers, and ensure that the keyboard battery is powered; 2. Re-pair the keyboard and receiver, insert the receiver, press the Connect button on the back of the keyboard after inserting the receiver, or use the key combination to enter the pairing mode, and can be used to assist with the binding with the help of Unifying software; 3. Update the driver and software support, install Logitech Options or Unifying software, check the driver status in the device manager, and restart the Bluetooth service if necessary; 4. Reduce signal interference, avoid the receiver from being close to Wi-Fi routers and other devices, and try to use a USB extension cable to shorten the distance from the keyboard. Most problems can be solved through the above methods. If there is still no improvement, hardware failure will be considered.

If your Logitech Unifying receiver fails to detect the keyboard, don't rush to change the device. This problem may not be a hardware corruption, but a problem with the connection or setup. Here are some common troubleshooting and fixes for most Logitech keyboards that use Unifying receivers.

1. Make sure that the receiver and the device are working normally

Sometimes the problem is not the keyboard itself, but the receiver or computer interface. You can check it in the following steps:

• Try changing the USB port : Some USB ports are insufficiently powered or have compatibility issues, especially when connected through docking stations or front panels.
• Check if other devices recognize the receiver : Plug the receiver to another computer to see if you can pair the mouse or other devices normally.
• Confirm that the keyboard battery is powered : out of power or too low will cause the keyboard to be unrecognized. Try changing to a new battery.

2. Re-pair the keyboard and receiver

If the hardware is fine but the keyboard still cannot be connected, it may be that the pairing information is lost. You need to rebind manually:

1. Plug the receiver into the computer.
2. Open the "Connect" button on the back of the keyboard (usually a small hole that requires a toothpick or needle tap).
3. Wait for a few seconds and the system may automatically recognize and connect.
4. If there is no response, it is recommended to install Logitech Unifying software to manage device pairing.

Note: Some keyboards need to press a specific key combination (such as a certain function key of Fn) to enter the pairing mode, please read the instructions for details.

3. Update driver and software support

Even if you are using a wireless keyboard, it is inseparable from the correct driver and software support. Here are a few key points:

• Install Logitech Options or Unifying software : These software not only manage devices, but also fix connection exceptions.
• Check whether the HID keyboard device in Windows Device Manager has an exclamation mark : If so, it means there is a problem with the driver. Try right-clicking to update the driver.
• Restart Bluetooth service (if you also use Bluetooth connection) : Sometimes Bluetooth and wireless receivers will conflict, try turning off Bluetooth.

4. Avoid signal interference or distance too far

Wireless keyboards rely on 2.4GHz signal communication and are susceptible to interference from other devices:

• Do not plug the receiver far from the keyboard, especially in the middle partition wall or metal objects.
• Avoid getting too close to Wi-Fi routers, microwave ovens and other devices.
• Moving the receiver closer to the keyboard using a USB extension cord can sometimes significantly improve the signal.

Basically these are the methods. In most cases, the problem can be solved by re-pairing or replacing the USB port. If it doesn't work, then consider whether the receiver is broken or the keyboard itself is malfunctioning.

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