Hood Sensor; Battery - HP dc7900 - Convertible Minitower PC Service & Reference Manual

Hood Sensor

1. Prepare the computer for disassembly
2. Remove the computer access panel
3. Remove the optical drive
4. Remove the hard drive
5. Remove the hard drive cage
6. Unplug the hood sensor cable from the system board.
7. Slide the hood sensor into the chassis to remove it from its slot.
Figure 9-37
To install the hood sensor, 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.
208 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis
(Removing the Existing Optical Drive on page
(Hard Drive on page
(Hard Drive Cage on page
Removing the hood sensor
(Preparation for Disassembly on page
(Computer Access Panel on page
195).
199).
178).
183).
191).