HP dc73 Service Reference Guide - HP Compaq dc7800 Business PC - Page 168

Computer Setup, F10 Utility Guide

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8. Remove the four screws that secure the backwall assembly to the chassis (1), slide the backwall assembly toward the front of the chassis (2), and then lift it out of the chassis (3). To replace the backwall, reverse the removal procedures. Battery The battery that comes with your computer provides power to the real-time clock and has a lifetime of about three years. When replacing the battery, use a battery equivalent to the battery originally installed on the computer. The computer comes with a 3-volt lithium coin cell battery. NOTE: The lifetime of the lithium battery can be extended by plugging the computer into a live AC wall socket. The lithium battery is only used when the computer is NOT connected to AC power. WARNING! This computer contains an internal lithium manganese dioxide battery. There is a risk of fire and burns if the battery is not handled properly. To reduce the risk of personal injury: Do not attempt to recharge the battery. Do not expose to temperatures higher than 140°F (60°C). Do not disassemble, crush, puncture, short external contacts, or dispose of in fire or water. Replace the battery only with the HP spare designated for this product. CAUTION: Before replacing the battery, it is important to back up the computer CMOS settings. When the battery is removed or replaced, the CMOS settings will be cleared. Refer to the Computer Setup (F10) Utility Guide for information on backing up the CMOS settings. NOTE: HP encourages customers to recycle used electronic hardware, HP original print cartridges, and rechargeable batteries. For more information about recycling programs, go to http://www.hp.com/ recycle. 156 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis

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8.
Remove the four screws that secure the backwall assembly to the chassis (1), slide the backwall
assembly toward the front of the chassis (2), and then lift it out of the chassis (3).
To replace the backwall, reverse the removal procedures.
Battery
The battery that comes with your computer provides power to the real-time clock and has a lifetime of
about three years. When replacing the battery, use a battery equivalent to the battery originally installed
on the computer. The computer comes with a 3-volt lithium coin cell battery.
NOTE:
The lifetime of the lithium battery can be extended by plugging the computer into a live AC wall
socket. The lithium battery is only used when the computer is NOT connected to AC power.
WARNING!
This computer contains an internal lithium manganese dioxide battery. There is a risk of
fire and burns if the battery is not handled properly. To reduce the risk of personal injury:
Do not attempt to recharge the battery.
Do not expose to temperatures higher than 140°F (60°C).
Do not disassemble, crush, puncture, short external contacts, or dispose of in fire or water.
Replace the battery only with the HP spare designated for this product.
CAUTION:
Before replacing the battery, it is important to back up the computer CMOS settings. When
the battery is removed or replaced, the CMOS settings will be cleared. Refer to the
Computer Setup
(F10) Utility Guide
for information on backing up the CMOS settings.
NOTE:
HP encourages customers to recycle used electronic hardware, HP original print cartridges,
and rechargeable batteries. For more information about recycling programs, go to
recycle
.
156
Chapter 8
Removal and Replacement Procedures Small Form Factor (SFF) Chassis