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About this manual
®
This manual contains service and reference information for the following ThinkPad
products.
ThinkPad P53
Machine Types (MT) 20QN and 20QQ
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 21.
iii
© Copyright Lenovo 2019
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