HP Pavilion Dv9400 Entertainment Notebook Pc Series Service Guide

							Product Description
Maintenance and Service Guide 1–13
Ta b l e  1 - 4
Keyboard Components
Item Component Function
1 Function keys Execute frequently used system functions 
when pressed in combination with the 
fnkey.
2caps lock key Enables caps lock and turns on the caps 
lock light.
3fn
 key Executes frequently used system 
functions when pressed in combination 
with a function key or the esc key.
4 Windows logo key Displays the Microsoft Windows Start 
menu.
5 Windows 
applications keyDisplays a shortcut menu for items 
beneath the pointer.
6 Arrow keys Move the cursor around the screen.
7 Numeric keypad keys Can be used like the keys on an external 
numeric keypad.
8num lock key Enables numeric lock, turns on the 
embedded numeric keypad, and turns 
on the num lock light. 
						

							1–14 Maintenance and Service Guide
Product Description
The computer top components are shown below and described in 
Table 1-5.
To p  Co m p o n e n t s,  Pa r t  1 
						

							Product Description
Maintenance and Service Guide 1–15
Table 1-5
Top Components, Part 1
Item Component Function
1 Integrated camera 
(select models only)Records video and captures still photos.
2 Internal microphones 
(2, select models only)Record sound.
✎A microphone icon next to each 
microphone opening indicates that 
the computer has internal 
microphones.
3 Speakers (2) Produce sound.
4 Power button When the computer is
■Off, press to turn on the computer.
■On, press to enter hibernation.
■In standby, briefly press to exit standby.
■In hibernation, briefly press to 
exit hibernation.
If the computer has stopped responding 
and Microsoft® Windows® shutdown 
procedures cannot be used, press and hold 
the power button for at least 5 seconds to 
turn off the computer.
5 Caps lock light On: Caps lock is on.
6 Volume mute button Mutes and restores speaker sound.
7 Volume scroll zone Adjusts speaker volume. Slide your finger 
to the left to decrease volume and to the 
right to increase volume. You can also tap 
the minus sign on the scroll zone to 
decrease volume, or tap the plus sign on 
the scroll zone to increase volume.
8 Num lock light On: Num lock is on. 
						

							1–16 Maintenance and Service Guide
Product Description
The computer top components are shown below and described in 
Table 1-6.
To p  Co m p o n e n t s,  Pa r t  2 
						

							Product Description
Maintenance and Service Guide 1–17
Table 1-6
Top Components, Part 2
Item Component Function
1 Media button If QuickPlay is not installed and the 
computer is
■On, opens the music program or Media 
menu, which allows you to select a 
multimedia program.
■Off, does not function.
■In standby, resumes from standby into 
Windows.
If QuickPlay is installed and the computer is
■On, opens the music program or Media 
menu, which allows you to select a 
multimedia program.
■Off, opens the music program or the 
Media menu, which allows you to select 
a multimedia program.
■In standby, resumes from standby into 
Windows.
✎The media button does not affect the 
procedure for restoring from 
hibernation.
2 DVD button When the computer is
✎On, opens the default DVD program 
to start a DVD in the optical drive.
✎Off, opens QuickPlay to start a DVD 
in the optical drive. If the QuickPlay 
software is not installed, the DVD 
button starts in Windows.
✎In hibernation, opens QuickPlay to 
start a DVD in the optical drive. If 
QuickPlay is not installed, the 
computer resumes from hibernation. 
						

							1–18 Maintenance and Service Guide
Product Description
3 Previous/rewind 
buttonWhen a disc is playing in the optical drive:
■Plays the previous track or chapter, 
when pressed once.
■Rewinds when pressed with the fn key.
4 Play/pause button When a disc is in the optical drive and is
■Not playing, plays the disc.
■Playing, pauses the disc.
5 Next/fast forward 
buttonWhen a disc is playing in the optical drive:
■Play the next track or chapter, when 
pressed once.
■Fast forwards when pressed with the 
fnkey.
6 Stop button When a disc is playing in the optical drive, 
stops the current disc activity.
Table 1-6
Top Components, Part 2 (Continued)
Item Component Function 
						

							Product Description
Maintenance and Service Guide 1–19
The computer TouchPad components are shown below and 
described in Table 1-7.
TouchPad Components
Table 1-7
Touchpad Components
Item Component Function
1 TouchPad light Blue: TouchPad is enabled.
Amber: TouchPad is disabled.
2 TouchPad Moves the pointer and selects or activates 
items on the screen.
3 Left and right 
TouchPad buttonsFunction like the left and right buttons on an 
external mouse.
4 TouchPad on/off 
buttonEnables/disables the TouchPad.
5 TouchPad vertical 
scroll zoneAllows you to scroll up or down. 
						

							1–20 Maintenance and Service Guide
Product Description
The external components on the bottom of the computer are 
shown below and described in Table 1-8.
Bottom Components
Ta b l e  1 - 8
Bottom Components
Item Component Function
1 Battery bay Holds the battery.
2 Battery release latch Releases the battery from the 
battery bay. 
						

							Product Description
Maintenance and Service Guide 1–213 Optical drive Reads an optical disc.
4 Secondary hard drive bay Holds an optional secondary hard drive.
Primary hard drive bay Hold the primary hard drive.
5 Vents (6) Enable airflow to cool internal 
components.
✎The computer fan starts up 
automatically to cool internal 
components and prevent 
overheating. It is normal for the 
internal fan to cycle on and off 
during routine operation.
6 Memory module 
compartmentContains the memory module slots, the 
Mini Card slot, and the RTC battery.
Ta b l e  1 - 8
Bottom Components (Continued)
Item Component Function 
						

							1–22 Maintenance and Service Guide
Product Description
1. 5 D e s i g n  o v e r v i e w
This section presents a design overview of key parts and features 
of the computer. Refer to Chapter 3, “Illustrated Parts Catalog,” 
to identify replacement parts, and Chapter 5, “Removal and 
Replacement Procedures,” for disassembly steps.
The system board provides the following device connections:
■AMD Mobile Turion and Mobile AMD Athlon processors
■Audio
■Display
■ExpressCard
■Fan
■Hard drive
■Intel Core Duo processors
■Keyboard and TouchPad
■Memory module
■Mini Card module
ÄCAUTION: To properly ventilate the computer, allow at least a 7.6-cm 
(3-inch) clearance on the left and right sides of the computer.
The computer uses an electric fan for ventilation. The fan is 
controlled by a temperature sensor and is designed to turn on 
automatically when high temperature conditions exist. These 
conditions are affected by high external temperatures, system 
power consumption, power management/battery conservation 
configurations, battery fast charging, and software. Exhaust air is 
displaced through the ventilation grill located on the left side of 
the computer.