About this manualThis manual contains service and reference information for the following ThinkPad® products.ThinkPad S1 Yoga Machine type (MT) 20CD and 20C0Use 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 ThinkPadproducts. 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 19.© Copyright Lenovo 2013 iii