HP OMNIBOOK 4100 Service Manual page 50

Reassembly Notes
Note: Installing a New Motherboard
Caution: Replace the motherboard with one that is compatible with the OmniBook model and
CPU module—see the table on page 2-19.
If any RAM boards are present, transfer them from the old motherboard to the new one:
Reprogram the BIOS IC—see the note below.
Store the serial number electronically in the new motherboard—see the steps below.
Note: Installing a New Bottom Case
Transfer these parts from the old bottom case to the new one:
I/O door, docking doors, and module latches (see the figures below).
Speakers.
Install a new regulatory/business card label.
Transfer the old serial number label and install a new overlay—or create a new serial number
label using the steps below.
Route the speaker wires so they do not get pinched or block screw holes.
When you install the audio jack PCA, the metal shield goes under the motherboard. If the shield
comes off the PCA, you can install the shield after you install the PCA.
For an OmniBook 4100 or 4150†, route the fan wires at the bottom of the opening next to the
motherboard.
When attaching the IR PCA to the right frame, make sure the PCA is parallel with the back of the
case.
For an OmniBook 4150† with serial number TW924xxxxx, install a rubber VGA spacer on the
top of the PCA at the front-left corner. (Service note 4150-11.)
Caution
See "Removing the CPU Module" on page 2-19 for detailed precautions and instructions about
installing the CPU module.
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 motherboard, you must reprogram the IC.
Hewlett-Packard prefers that you program the IC with the latest BIOS. You can download it from
the OmniBook website (see page vi)—follow the directions provided.
HP OmniBook 4100/4150 Removal and Replacement 2-27