About this manual
This manual contains service and reference information for the following ThinkPad® products.
ThinkPad X220 Tablet and Machine Type 4294, 4296, 4297, 4298, 4299, 4300, and 4301 X220i Tablet
Use this manual along with the advanced diagnostic tests to troubleshoot problems.
Important:
This manual is intended only for trained service technicians who are familiar with ThinkPad products. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively.
Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 “Safety information” on page 1 and Chapter 2 “Important service information” on page 23.
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