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2-26 Removal and Replacement HP OmniBook 2100/3000/3100
Note: Installing a New Bottom Case
• Transfer these parts from the old bottom case to the new one:
Plastic parts (I/O door, RAM cover).
Lock plate and IR lens, if not included with new case (see Figure 2-21).
• Install new regulatory and serial-number labels on the bottom case—see the steps below.
• Check that the audio PCA has two rubber bumpers attached to the board directly behind the two
connectors.
• Check that the audio PCA is securely attached to the underside of the motherboard before
installing the motherboard. The audio PCA can work loose if you flex the motherboard
excessively.
• Place the audio jack cover onto the audio jacks before you lower the motherboard into the case.
• Raise the front edge of the motherboard only high enough for the PCMCIA pushbuttons to clear
the bottom case. Work the I/O bracket into the back of the bottom case, then lower the front edge
into the case.
• Do not install screws into the motherboard next to the ac adapter socket or next to the plug-in
module socket. (See Figure 2-21.)
Caution
When installing the CPU module onto the motherboard, press on the white target (Figure 2-20).
Otherwise, you could damage pressure-sensitive components.
• The two screws at the front-underside of the bottom case are the shortest screws—only 3 mm
long.
Caution
Insert the back end of the USB PCA into the case first, then carefully align the connector before
pressing it onto the motherboard. Take care not to damage the connector pins.
• Before you install the top case and heatsink, make sure you have installed only two screws in the
CPU module—the two at the front corners. (You install the remaining screw after you install the
heatsink.)
Note
If you installed a new motherboard with a new BIOS IC, the IC contains only enough basic
programming to boot the OmniBook. After installing the IC, you must reprogram it. Hewlett-
Packard prefers that you program the IC with the latest BIOS—follow the directions carefully. You
can download it from the OmniBook website (see page vi).
Storing the Serial Number Electronically
1. Exit Windows and boot to a DOS prompt.
2. Run ESN.EXE from one of these sources:
On a factory software installation, change to the \OMNIBOOK directory and type esn at the
prompt.
Otherwise, copy \Omnibook\Drivers\Hputils\Esn.exe from the OmniBook Recovery CD, then
run it on the OmniBook.