Design Overview; System Unit; Internal Boards - HP ProSignia 120 Maintenance And Service Manual

1.4 Design Overview

This section presents a design overview of the computer. The overview is limited to
field replaceable parts. All replacement parts are listed in Chapter 3.

1.4.1 System Unit

The computer is a traditional clamshell design with a display assembly attached to a
system unit. The computer opens to reveal a backlit LCD display and a full-function
keyboard. The display is designed for a continuously adjustable tilt angle.

1.4.2 Internal Boards

The system electronics are integrated on four printed circuit assemblies: the audio/led
board, system board, modem board, and the DC-DC converter board.
The audio/led board provides support for the audio functions.
The system board integrates the processor, on-board memory, level 2 cache, local
bus video adapter, and PCMCIA/CardBus adapter.
The optional modem board supports data or fax functions.
The DC-DC converter board creates the system voltages (3.3 VDC and 5 VDC)
from the battery or AC/DC input.
Processor
An Intel Mobile Pentium II processor is located on the system board for the 233 MHz,
266 MHz, or 300 MHz models.
Memory
Base memory is 32-MB with 32-, 64-, or 128-MB of optional expansion memory. Base
memory is onboard memory built into the system board. Expansion memory consists of
one memory expansion board available as a user installable option. Some models come
standard with 64-MB of total memory. This consists of 32-MB of standard memory
and 32-MB of additional memory in the memory expansion unit.
Cache
Level 2 cache is integrated in the CPU module. It is not user upgradable.
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