Lenovo ThinkPad Yoga 260 User Manual page 125

Refer to "Diagnosing problems" on page 93 and run a diagnostic test of the USB connector.
A ThinkPad Pen Pro problem
Problem: The ThinkPad Pen Pro does not perform well.
Solution: If the pen does not perform well, insert the pen into the pen slot to charge it for about five minutes.
Note: Ensure that your computer is on. Otherwise, the pen will not be charged.
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Chapter 8 Troubleshooting computer problems