compaq presario 900 series User Manual

							1–16Maintenance and Service Guide
Product Description
The computer keyboard components are shown in Figure 1-4 and 
described in Table 1-6.
Figure 1-4. Keyboard Components
Table 1-6
Keyboard Components
Item Component Function
1
F1 through F12 
function keysPerform preset functions.
2
Fn key Used with hotkeys to perform preset hotkey 
functions.
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							Product Description
Maintenance and Service Guide1–17
3 Windows logo keys Display the Windows Start menu.
4 Windows application 
keyDisplays a menu when using a Microsoft 
application. The menu is the same one that 
is displayed by pressing the right mouse 
button.
5 Cursor control keys Move the cursor around the screen.
6 Embedded numeric 
keypadConverts keys to numeric keypad.
7
Num lock key Turns on the numeric lock function.
On: Num lock is on and the embedded 
numeric keypad is enabled.
Table 1-6
Keyboard Components (Continued)
Item Component Function
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							1–18Maintenance and Service Guide
Product Description
The computer top components are shown in Figure 1-5 and 
described in Table 1-7.
Figure 1-5. Top Components
Table 1-7
Top Components
Item Component Function
1 Power light On: Power is turned on.
Blinking: Computer is in Standby. The 
power light also blinks if a battery pack that 
is the only available power source reaches 
a low-battery condition.
2 Num lock light On: Num lock is on and the embedded 
numeric keypad is enabled.
3 Easy Access 
Buttons (3)Provide quick access to the Internet. Refer 
to the Hardware Guide that ships with the 
computer for information about these 
buttons.
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							Product Description
Maintenance and Service Guide1–19
4 Power button Turns on the computer. Use the operating 
system Shut Down command to turn off the 
computer.
5 Digital audio button Launches Windows Media Player to play 
MP3 music.
6 Volume control buttons Adjust the volume of the stereo speakers.
7 Caps lock light On: Caps lock is on.
8 Drive indicator light Turns on when the hard drive, CD-, or 
DVD-ROM drive is accessed.
9 Display lid switch Turns off the computer display if the 
computer is closed while on.
10 TouchPad Moves the mouse cursor, selects, and 
activates.
11 TouchPad buttons Function like the left and right mouse 
buttons on an external mouse.
12 Power/Standby light On: Power is turned on.
Off: Power is turned off.
Blinking: Computer is in Standby mode.
13 EasyScroll Scrolls the screen left, right, up, and down.
14 Battery power light On: A battery pack is charging.
Blinking: A battery pack that is the only 
available power source has reached a 
low-battery condition.
Table 1-7
Top Components (Continued)
Item Component Function
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							1–20Maintenance and Service Guide
Product Description
The external components on the bottom of the computer are 
shown in Figure 1-6 and described in Table 1-8.
Figure 1-6. Bottom Components 
Table 1-8
Bottom Components
Item Component Function
1 Hard drive retention screw Secures the hard drive to the 
computer.
2 Hard drive bay Supports the primary hard drive. 
The hard drive is secured to the 
computer by one screw.
3 Mini PCI communications 
compartmentContains the mini PCI modem 
card.
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							Product Description
Maintenance and Service Guide1–21
4 RJ-11 modem jack Connects the modem cable to an 
internal modem. A modem cable is 
included with internal modem 
models.
5 RJ-45 network jack Connects the network cable. A 
network cable is not included with 
the computer.
6 Connector cover Protects the parallel, external 
monitor, external keyboard/mouse, 
and USB connectors.
7 Certificate of Authenticity label Contains the Product Key, which 
may need to be entered before 
using some Windows operating 
systems.
8 Memory expansion 
compartmentCovers the memory expansion 
compartment that contains two 
memory expansion slots for 
memory expansion boards.
9 Battery pack release switch Releases the battery pack from 
the battery compartment.
10 Battery bay Accepts an 8-cell Li ion 
battery pack.
11 Serial number Identifies the computer; needed 
when you call Compaq customer 
support.
Table 1-8
Bottom Components (Continued)
Item Component Function
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							1–22Maintenance and Service Guide
Product Description
1.6 Design Overview
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:
■Memory expansion board
■Hard drive
■Display
■Keyboard/TouchPad or pointing stick
■Audio
■AMD Athlon and Duron processors
■Fan
■PC Card
■Modem or modem/NIC
The computer uses an electrical 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 applications. 
Exhaust air is displaced through the ventilation grill located on 
the left side of the computer.
Ä
CAUTION: To properly ventilate the computer, allow at least a 
3-inch (7.6-cm) clearance on the left and right sides of the 
computer.
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							Maintenance and Service Guide2–1
2
Troubleshooting
ÅWARNING: Only authorized technicians trained by Compaq should 
repair this equipment. All troubleshooting and repair procedures 
are detailed to allow only subassembly/module level repair. 
Because of the complexity of the individual boards and 
subassemblies, no one should attempt to make repairs at the 
component level or make modifications to any printed wiring board. 
Improper repairs can create a safety hazard. Any indication of 
component replacement or printed wiring board modification may 
void any warranty or exchange allowances.
2.1 Computer Setup and 
Diagnostics Utilities
Selecting Computer Setup or 
Compaq Diagnostics
The computer features two Compaq system management utilities:
■Computer Setup—A system information and customization 
utility that can be used even when your operating system is 
not working or will not load. This utility includes settings that 
are not available in Windows.
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							2–2Maintenance and Service Guide
Troubleshooting
■Compaq Diagnostics—A system information and diagnostic 
utility that is used within your Windows operating system. 
Use this utility whenever possible to:
❏Display system information.
❏Test system components.
❏Troubleshoot a device configuration problem in 
Windows 2000, Windows XP Professional, or 
Windows XP Home.
Using Computer Setup
Information and settings in Computer Setup are accessed from 
the File, Security, or Advanced menus:
1. Turn on or restart the computer. Press 
F10 while the 
F10 = ROM Based Setup message is displayed in the 
lower-left corner of the screen.
❏To change the language, press F2.
❏
To view navigation information, press F1.
❏
To return to the Computer Setup menu, press esc.
2. Select the File, Security, or Advanced menu.
3. To close Computer Setup and restart the computer:
❏Select File > Save Changes and Exit and press enter.
or
❏Select File > Ignore Changes and Exit and press enter.
4. When you are prompted to confirm your action, press F10.
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							Troubleshooting
Maintenance and Service Guide2–3
Selecting from the File Menu
Table 2-1
File Menu
Select To Do This
System Information■View identification information about the 
computer, a docking base, and any battery 
packs in the system.
■View specification information about the 
processor, memory and cache size, and 
system ROM.
Save to Floppy Save system configuration settings to a diskette.
Restore from Floppy Restore system configuration settings from a 
diskette.
Restore Defaults Replace configuration settings in Computer 
Setup with factory default settings. (Identification 
information is retained.)
Ignore Changes and Exit Cancel changes entered during the current 
session, then exit and restart the computer.
Save Changes and Exit Save changes entered during the current 
session, then exit and restart the computer.
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