Removal Procedure

1.Unplug the ac adapter, if present, and remove the battery.

2.Remove these additional assemblies:

Floppy module or other module (page 2-3).

Hard disk drive (page 2-5).

Keyboard (page 2-9).

3.For an OmniBook that has a 2-screw CPU top plate, remove the screw from the heatsink cover and lift it off the heatpipe. (The figure on page 2-26 shows these and other parts.)

4.Remove the screws holding the CPU top plate (see the picture on page 4-8 for details):

For an OmniBook 4150B, remove the five screws from the heatsink/top plate assembly—one at the front-right corner (M2×12mm), two at the left side (M2 with spring), and two at the diagonal corners of processor (M2×3.5mm).

For an OmniBook 4150† with a 5-screw CPU top plate, remove the five screws—one at the heatsink (M2×5mm), two at the corners of the CPU housing (M2×14mm), and two at diagonal corners of the CPU module below (M2×3.5mm). (Do not remove the two small screws above the middle of the CPU.)

For an OmniBook with a 2-screw CPU top plate, remove the two screws at the corners (M2×14mm).

5.For an OmniBook 4150B, lift off the heatsink/top plate.

For an OmniBook 4150† with a 5-screw CPU top plate, lift off the top plate, carefully detaching the heatpipe end tab from the slot in the fan cover.

2-20 Removal and Replacement

HP OmniBook 4100/4150