Lenovo C540 Touch All-in-One - Manual (Page 8)

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User Guide
Left and right views of the computer
Attention: Be sure not to block any air vents on the computer. Blocked
air vents may cause thermal problems.
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USB connector Headphone connector
Microphone connector USB connector
Memory card reader Power button
Optical drive eject button Optical drive
Attention: Do not insert 3-inch discs into the optical drive.