Lenovo ThinkCentre M55 - Manual (Page 7)

Overview
This guide is intended to be used by customers who are replacing Customer
Replaceable Units (CRUs) as well as trained service personnel who are replacing
Field Replaceable Units (FRUs). In this guide CRUs and FRUs will often be
referred to as parts.
This guide does not include procedures for all parts. It is expected that cables,
switches, and certain mechanical parts can be replaced by trained service personnel
without the need for step-by-step procedures.
Note: Use only parts provided by Lenovo ™ .
This guide contains procedures for replacing the following parts:
v Power supply
v System board
v Microprocessor
v Memory modules
v Optional PCI adapter
v Hard disk drive
v Optical drive
v Diskette drive
v System fan assembly
v Keyboard
v Mouse
v Internal speaker
Safety information for customers
Do not open your computer or attempt any repair before reading the “Important
safety information” in the Safety and warranty guide that was included with your
computer. If you no longer have this copy of the Safety and warranty guide, you
can obtain one online from the Support Web site at http://www.lenovo.com/
think/support.
Safety information for service personnel
Do not attempt any repair before reading the “Important safety information” in the
Hardware Maintenance Manual (HMM) for the computer. You can find the HMM on
the Support Web site at http://www.lenovo.com/think/support.
Additional information resources
If you have Internet access, the most up-to-date information for your computer is
available from the World Wide Web.
You can find the following information:
v CRU removal and installation instructions
v Publications
v Troubleshooting information
v Parts information
v Downloads and drivers
v Links to other useful sources of information
© Lenovo 2006. Portions © IBM Corp. 2005, 2006. v