HP Omnibook 900 Service Manual

HP OmniBook 900 Product Information 1-5
Checking the Status of the OmniBook
The main OmniBook status lights, located at the front-right edge of the display bezel at the top of the
display, indicate power status and drive activity. (These lights are on the motherboard.)
 Table 1-4. Main Status Lights (Motherboard)
           Meaning
Power mode
Steady green light: OmniBook is running (On mode).
Steady orange light: OmniBook is suspended (Suspend or Standby mode).
No light: OmniBook is off (Off or Hibernate...

1-6 Product Information HP OmniBook 900
Using Fn Hot Keys
The Fn key combined with another key is a hot key—a shortcut key sequence for various system
controls. For an external keyboard, CTRL+ALT is normally equivalent to the Fn key.
 Table 1-6. Fn Hot Keys
Hot KeyEffect
Fn + F1Decreases the display’s brightness.
Fn + F2 Increases the display’s brightness.
Fn + F5 Switches among the built-in display, an external display, and simultaneous displays.
Fn + F7 Toggles audio output on and off (mute).
Fn + F8...

HP OmniBook 900 Product Information 1-7
System Resources
The tables in this section show typical resource usage as set up by the OmniBook BIOS. Plug-and-
play operating systems, drivers, and BIOS Setup settings may change some of the entries.
To see other, non-default possibilities, use the BIOS Setup utility (see page 3-24), which lists port and
audio device configurations in the System Devices menu.
 Table 1-7. System Interrupts
0 System timer
1 Keyboard
2 Cascade IRQ 9
3 Free  (or COM2 infrared port,...

1-8 Product Information HP OmniBook 900
 Table 1-9. System Input/Output Addresses (100-3FF)
120-127Audio (OmniBook 900† only)
170-177 Internal CD-ROM drive (secondary IDE controller)
1F0-1F7 Internal hard disk (primary IDE controller)
220-22F Audio
376 Internal CD-ROM drive (secondary IDE controller)
378-37F LPT1 (printer port)
388-38B Audio
3B0-3BB Video adapter
3C0-3DF Video adapter
3E0-3E1 PCMCIA controller
3F0-3F5 Floppy controller
3F6 Internal hard disk (primary IDE controller)
3F7 Floppy...

HP OmniBook 900 Product Information 1-9
Specifications
The following tables list descriptions for the OmniBook and its accessories.
 Table 1-11. OmniBook 900 Specifications
Physical Attributes Models with 12-inch display
Notebook size: 11.8 x 8.8 x 1.26 in (30.0 x 22.5 x 3.2 cm).
Notebook weight: 4 lb (1.8 kg).
Models with 13-inch display
Notebook size: 11.9 x 9.3 x 1.4 in (30.4 x 23.7 x 3.5 cm).
Notebook weight: 4.3 lb (1.9 kg).
Processor and
Bus Architecture500-MHz or 450-MHz Intel Mobile Pentium III...

1-10 Product Information HP OmniBook 900
Input/OutputFDD/IDE interface for external module bay.
Universal serial bus (USB).
9-pin, 115,200-bps serial (16550 UART).
25-pin bi-directional ECP/EPP parallel.
Video-out (Resolution: up to 1280×1024×256 colors, or up to 1600×1200×64K colors
for Omnibook 900B. Refresh rate: 60 to 85 Hz.)
PS/2 keyboard/mouse.
4-Mbps IrDA-compliant infrared port.
ExpandabilityOne Type III or two Type II 16-/32-bit PC Card slots (3.3- and 5-V support).
CardBus enabled.
External...

HP OmniBook 900 Product Information 1-11
 Table 1-12. OmniBook 900 Accessories
AccessoryDescriptionOmniBookCompatibility
900B900†41502100/7100
Memory
F1456A 32-MB SDRAM (66 MHz) expansion module
·· ·
F1457A 64-MB SDRAM (66 MHz) expansion module
·· ·
F1622A 128-MB SDRAM (66 MHz) expansion module
·· ·
F1456B 32-MB SDRAM (100 MHz) expansion module
·· · ·
F1457B 64-MB SDRAM (100 MHz) expansion module
·· · ·
F1622B 128-MB SDRAM (100 MHz) expansion module
·· · ·
Hard Drives
F1707A 6-GB internal hard disk...

1-12 Product Information HP OmniBook 900
AccessoryDescriptionOmniBookCompatibility
900B900†41502100/7100
F1761B MPEG DVD decoder PC Card
·· ·
TCM3C589 10-Mbps Ethernet PC Card by 3Com
·· · ·
Docks
F1451A Port replicator (tray: page 4-7)
·· · ·
F1452A Mini dock (tray: page 4-7)
·· · ·
F1453A Monitor stand (short) for F1451A and F1452A
·· · ·
F1468A Docking module bay adapter
·· ·
F1477A Docking system and monitor stand (tall) (tray:
page 4-7)·· · ·
† Models called 900† in this manual have no marking in...

HP OmniBook 900 Product Information 1-13
Internal Design
The motherboard PCA is the central component of the OmniBook design. It plays a role in virtually
all system functions. The CPU module and most other subsystems connect to the motherboard.
The following figure shows the connections among the replaceable electrical modules. As a substitute
for a functional block diagram, see the table on page 1-14—it lists the roles that the replaceable
modules play in each of the functional subsystems.
 
PCMCIA...

1-14 Product Information HP OmniBook 900
 Table 1-13. Functional Structure
BootupCPU module
Motherboard
BIOS IC
Floppy disk module
Hard disk driveMain processor.
Primary system circuitry.
Code for basic system functions.
First source of disk-based startup code.
Second source of disk-based startup code.
ProcessorCPU module
MotherboardMain processor, numeric data processor, L1 and L2 cache.
Primary system circuitry.
MemoryMotherboard
RAM boardFirst 32 MB of RAM, video RAM.
Changeable RAM.
PowerBattery...