Chapter 2. Important Service Information; Strategy For Replacing Frus; Strategy For Replacing A Hard Disk Drive - Lenovo ThinkPad T420i Hardware Maintenance Manual

Chapter 2. Important service information

This chapter presents following important service information that applies to all machine types supported by
this manual:
• "Strategy for replacing FRUs" on page 23
– "Strategy for replacing a hard disk drive" on page 23
– "Important notice for replacing a system board" on page 24
– "How to use error message" on page 24
• "Strategy for replacing FRUs for CTO, CMV, and GAV" on page 25
– "Product definition" on page 25
– "FRU identification for CTO, CMV, and GAV products" on page 25
Important:
Advise customers to contact the Lenovo Customer Support Center if they need any assistance in obtaining or
installing any software fixes, drivers, and UEFI BIOS downloads. Telephone numbers forLenovo Support are
available at http://www.lenovo.com/support.
System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo
service technicians are available in the following support site:
http://www.lenovoservicetraining.com/ion/

Strategy for replacing FRUs

Before replacing parts:
Make sure that all software fixes, drivers, and UEFI BIOS downloads are installed before replacing any
FRUs listed in this manual.
After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before
completing the service action.
To download software fixes, drivers, and UEFI BIOS, go to http://www.lenovo.com/support and click
Download Drivers & Software. Then follow the instructions on the screen to install the necessary software.
Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs:
• If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall
the original FRU before you continue.
• Some computers have both a processor board and a system board. If you are instructed to replace either
the processor board or the system board, and replacing one of them does not correct the problem,
reinstall that board, and then replace the other one.
• If an adapter or a device consists of more than one FRU, any of the FRUs may be the cause of the error.
Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change.
Replace only the FRU that changed the symptoms.
Attention: The setup configuration on the computer you are servicing may have been customized. Running
Automatic Configuration may alter the settings. Note the current configuration settings (using the View
Configuration option); then, when service has been completed, verify that those settings remain in effect.

Strategy for replacing a hard disk drive

Always try to run a low-level format before replacing a hard disk drive. This will cause all customer data on
the hard disk to be lost. Be sure that the customer has a current backup of the data before doing this task.
© Copyright Lenovo 2012
®
authorized
23