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1-14 Product Information HP OmniBook 2100/3000/3100
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 (MMO) and all 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 1-15—it lists the roles the replaceable modules
play in each of the functional subsystems.
PCMCIA
Cards
CPU
Module
Audio
PCA
Hard Disk
Drive
USB
PCA
Floppy Drive
or
Plug-In
Module
Main
Battery
Keyboard
RAM
Boards
Heatsink
LVDS
PCA*
Inverter PCA
Icon PCA
LCD
Module
Top Ca se
(Touch pad, Speakers,
Microphone)
IR
PCA
Motherboard
PCA
System
BIOS**
Kybd
BIOS**
Fan
Figure 1-4. Replaceable Module Diagram
The power switch and
the lid switch are
contained on the Icon
PCA.
All external connections
(except USB and IR) are
made to the
motherboard.
* The LVDS PCA is
present only with a 13"
display.
** One BIOS IC on the
OmniBook 2100/3100
contains the system and
keyboard BIOS.