Lenovo 27523KU, Hardware Maintenance Manual, Page: 31 / 218

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 25
– “Strategy for replacing a hard disk drive” on page 26
– “Important notice for replacing a system board” on page 26
– “How to use error message” on page 26
• “Strategy for replacing FRUs for CTO, CMV, and GAV” on page 26
– “Product definition” on page 26
– “FRU identification for CTO, CMV, and GAV products” on page 27
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 for
Lenovo Support are available at:http://www.lenovo.com/support/phone
System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo
®
authorized service technicians are available in the following support site:
Advise customers to contact the Customer Support Center at 800-426-7378 if they need assistance in
obtaining or installing any software fixes, drivers, and BIOS downloads.
Customers in Canada should call the Customer Support Center at 800-565-3344 for assistance or download
information.
Strategy for replacing FRUs
Before replacing parts:
Make sure that all software fixes, drivers, and BIOS downloads are installed before replacing any FRUs
listed in this manual.
After a system board is replaced, ensure that the latest BIOS is loaded to the system board before
completing the service action.
To download software fixes, drivers, and BIOS, do as follows:
1. Go to http://www.lenovo.com/support.
2. Enter the product number of the computer or press Auto-detect button on the screen.
3. Select Downloads and drivers .
4. Follow the directions on the screen and 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.
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