About this manual
This manual contains service and reference information for the following ThinkPad® Notebook products.
ThinkPad L420
Machine Type (MT) 7826, 7827, 7829, 7853, 7854, and 7856
ThinkPad L421
MT 7826, 7827, 7829, 7853, 7854, and 7856
ThinkPad L520
MT 5015, 5016, 5017, 5019, 7859, and 7860
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 25.
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