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