
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Computer Removal and Replacement Procedures 7-3
7.3 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 4.
7.3.1 System Unit
The computer is a traditional clamshell design with a display unit attached to a system
unit. The computer opens to reveal a backlit LCD display and a full-sized keyboard.
The display is designed for a continuously adjustable tilt angle.
7.3.2 Internal Boards
The system electronics are integrated on five printed circuit assemblies: the LED status
panel, audio board, system board, serial-parallel port board, and the DC-DC converter
board.
■ The LED status board connects the system board to the display cables and supports
the status LEDs.
■ The DC-DC converter board creates the CPU (2.9v or 2.5v) and system voltages
(3.3v and 5v) from the battery or AC/DC input.
■ The system board integrates the processor, memory, level 2 cache, local bus video
adapter, PCMCIA/CardBus adapter and audio controller.
Processor
The processor located on the system board for the 120 MHz and 133 MHz models is the
Intel P54LM Pentium processor.
Memory
Base memory is 16-MB with 8-, 16-, 32-, or 64-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.
Cache
Level 2 cache, available on some models, is soldered on the system board. The level 2
cache 256-Kbyte is a pipelined synchronous burst design. It is not user upgradable.
Audio Controller
The audio controller is located on the system board. The audio amplifiers and
connectors are on the audio board printed circuit assembly.
Comentarios a estos manuales