Removal and replacement procedures 4–5
7. Replace the RTC battery and reassemble the computer.
8. Connect AC power to the computer. Do not reinsert any batteries at this time.
9. Turn on the computer.
All passwords and all CMOS settings have been cleared.
Component replacement procedures
This chapter provides removal and replacement procedures.
There are as many as 72 screws, in 9 different sizes, that must be removed, replaced, or loosened when servicing
the computer. Make special note of each screw and standoff size and location during removal and replacement.
Serial number
The service tag, affixed to the bottom of the computer, provides information that may be needed when
troubleshooting system problems. The service tag provides the following information:
When ordering parts or requesting information, provide the computer serial number and model number located on
the bottom of the computer.
Item Component Description
1 Product name This is the product name affixed to the front of the computer.
2 Serial number (s/n) This is an alphanumeric identifier that is unique to each product.
3 Part number/Product number (p/n) This number provides specific information about the product's
hardware components. The part number helps a service techni-
cian to determine what components and parts are needed.
4 Model description This is the number used to locate documents, drivers, and sup-
port for the computer.
5 Warranty period This number describes the duration of the warranty period for the
computer.
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