Maintenance and Service Guide

1-24 Product Information Service Manual
Table 1-8. Functional Structure Description
Bootup CPU module
Motherboard
Hard disk drive
Floppy drive
Main processor (MMO)
Primary system circuitry, system BIOS
First source of disk-based startup code
Second source of disk-based startup cod.
Processor CPU module
Motherboard
Main processor, numeric data processor, L1 and L2 cache
Primary system circuitry
Memory Motherboard
SDRAM module
Video RAM (XE4500)
Changeable SDRAM (2 slots), video RAM (XE4100)
Power Battery
Motherboard
Switchboard PCA
AC adapter
Power storage
AC adapter socket, reset button, lid switch, power supply, power
control circuitry
Power button
AC-to-DC converter
Display Motherboard
SDRAM module
Display assembly
Graphics controller, video RAM
Display output, backlight, power converter for backlight
Hard disk Motherboard
Hard disk drive
Hard disk controller
Hard disk mechanism
Floppy drive Motherboard
Floppy drive
I/O controller, floppy connector
Floppy drive mechanism
Keyboard Motherboard
Switchboard PCA
Keyboard
Keyboard BIOS, keyboard controller
Power switch, one-touch buttons
Key switches
PS/2
TouchPad
Motherboard
Top case
Keyboard circuitry, keyboard controller, keyboard BIOS
Touch pad sensor, Select buttons, controller (PS/2 output)
Audio Motherboard
Speaker assembly
Audio controller, audio decoder, speaker amplifier, microphone,
external
audio jacks, headphone amplifier, audio-off switch
Speakers
Status Motherboard
Switchboard PCA
Top case
LED circuitry, keyboard controller
Keyboard LEDs
Main status LEDs
Serial Motherboard I/O controller, serial connector
Parallel Motherboard I/O controller, parallel connector
Infrared Motherboard
IR PCA
I/O controller
Infrared transmitter/receiver
PS/2 port Motherboard PS/2 connector, keyboard controller
USB Motherboard Bus controller (South Bridge), USB connector
S-Video Motherboard I/O controller, S-video connector (certain models)
Port Replicator Motherboard Port replicator logic, port replicator connector (certain models)
PCMCIA Motherboard
PCMCIA socket
PCMCIA controller
PCMCIA connector
Wireless LAN
(certain
models only)
Mini PCI
Antenna PCAs
IR PCA
I/O controller, radio, radio frequency circuitry
Transmit/receive antennas
On/off switch, indicator light
LAN Motherboard LAN circuitry, bus controller, LAN connector
Modem Motherboard Modem circuitry (select models), modem connector