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Turn on your MK540 keyboard and mouse.
To connect the MK540 mouse and keyboard, plug the provided Unifying receiver into a
USB port on your computer.
Product Overview
1. Media hotkeys
2. Battery indicator light
3. On/Off
4. Caps Lock indicator light 8. Battery indicator light
Keyboard Features
Hotkeys
1. Backward 4. Mute
2. Play/Pause 5. Volume down 8. Battery check
3. Forward
6. Volume up
5. Palm rest
6. Shortcut keys
7. USB receiver
7. Calculator
9. Lock PC
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Table of Contents
Related Manuals for Logitech MK540
Summary of Contents for Logitech MK540
- Page 1 Turn on your MK540 keyboard and mouse. To connect the MK540 mouse and keyboard, plug the provided Unifying receiver into a USB port on your computer. Product Overview 1. Media hotkeys 5. Palm rest 2. Battery indicator light 6. Shortcut keys 3.
- Page 2 12. PC standby 11. Contextual menu (right-click) You can reprogram some of the F-keys shortcuts and hotkeys using the Logitech® Options software available for download below or from www.logitech.com/options. TIP: In the software settings, you can invert the FN mode if you prefer to access the enhanced functions without having to press the FN key.
- Page 3 LED indicators LED lights remind you when the battery needs to be changed or Caps Lock is engaged. You can also check your keyboard battery status at any time by pressing the Battery Check key below the LED light. When the battery level is good, the LED will glow green. When it is critical, the LED will glow red.
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Do you have a question about the MK540 and is the answer not in the manual?
Questions and answers
My 1 month old keyboard is now making loud clicking noises and the backspace key is no longer working. Is there a key I hit in error that is causing this? or just a defective keyboard?
The provided context does not mention loud clicking noises or issues with the backspace key as symptoms of a defective Logitech MK540 keyboard. Common troubleshooting steps include ensuring the keyboard is connected properly, checking the NumLock and other toggle keys, verifying keyboard settings in the operating system, and updating drivers. Testing the keyboard on another computer could help confirm if the problem persists. If the issue remains unresolved, contacting Logitech support may be necessary.
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my numbers pad does not work.
The number pad on the Logitech MK540 may not be working due to several reasons:
1. Num Lock is Disabled – Ensure that the Num Lock key is enabled. If pressing it once doesn’t work, try holding it for five seconds.
2. Incorrect Keyboard Layout – Verify that the correct keyboard layout is selected in Windows settings and matches your keyboard.
3. Toggle Keys Interference – Try enabling and disabling Caps Lock, Scroll Lock, and Insert while checking if the number keys work in different applications.
4. Mouse Keys Enabled – Disable "Turn on Mouse Keys" in the Ease of Access Center under "Make the mouse easier to use."
5. Sticky, Toggle, and Filter Keys Enabled – Disable these keys in the Ease of Access Center under "Make the keyboard easier to use."
6. Connection Issues – Ensure the keyboard or receiver is directly connected to the computer, not through a hub or extender.
7. Outdated Drivers – Update the keyboard drivers to the latest version.
8. User Profile Issue – Try using the keyboard with a new or different user profile.
9. Hardware Issue – Test the keyboard or receiver on a different computer to check if the issue persists.
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Some keys are incorrectly programmed on new MK540.
You can fix incorrectly programmed keys on the Logitech MK540 using Logitech Options software. Follow these steps:
1. Install Logitech Options if you haven't already by downloading it from logitech.com/options.
2. Open Logitech Options:
- Go to Start > Programs > Logitech > Logitech Options.
3. In the main window, click on the keyboard.
4. Select the framed key you want to reprogram.
5. Choose the correct function from the drop-down list.
6. The new function assignment will be highlighted in green.
If the key is not framed, it is not programmable.
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can i use the keyboard with another mouse the MK anywhere
Yes, the Logitech MK540 keyboard can be used with the Logitech MX Anywhere mouse, but they do not come as a bundled set. The MK540 keyboard uses a USB receiver for connectivity, while the MX Anywhere mouse typically supports both Bluetooth and USB receiver connections. As long as the computer has the necessary ports or Bluetooth support, both devices can be used together.
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my hotkey keyboard class filter driver is unable to load. PLEAS HELP
What does it mean when the battery indicator light is on for a little bit & then goes out?
The battery indicator light on the Logitech MK540 keyboard turns on for a short time and then goes out to show the battery status when the device is powered on. This is normal behavior and does not indicate a problem.
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HOW TORIGHT CLICK
You can right-click with the Logitech MK540 mouse by pressing the right mouse button. The mouse included in the MK540 combo has a standard left and right-click button.
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how do I reset the MK 540 keyboard
My Logitech keyboard is always on even when the switch is in the off position
The Logitech MK540 keyboard has a physical power switch that moves between red (off) and green (on) positions. If your keyboard remains on even when switched off, possible reasons include:
1. Battery Connection Issue – The power switch may not be fully disconnecting the battery. Try removing and reinserting the batteries.
2. Stuck or Faulty Switch – The switch might be defective or stuck in the "on" position internally.
3. Residual Power – Some keyboards retain minimal power briefly after switching off, but it should not stay on indefinitely.
4. Unifying Receiver Issue – If multiple Logitech devices are connected via the same receiver, check if another device is affecting power behavior.
Try removing the batteries for a few minutes and reinserting them. If the issue persists, the power switch may be faulty.
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Key board won’t type all letters