Lenovo ThinkPad T420si Hardware Maintenance Manual - Page 5
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About this manual This manual contains service and reference information for the following ThinkPad® products. ThinkPad T420s and T420si Machine types (MT) 4170, 4171, 4172, 4173, 4174, 4175, and 4176 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 31. © Copyright Lenovo 2012 iii
About this manual
This manual contains service and reference information for the following ThinkPad
®
products.
ThinkPad T420s and T420si
Machine types (MT) 4170, 4171, 4172, 4173, 4174, 4175, and 4176
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 31.
© Copyright Lenovo 2012
iii