Acer Extensa 660 Maintenance Manual

                                                                                        Operating Instructions   3-9
3.7.1 Lowering Inactivity Timeouts
Inactivity timeouts turn off devices in the computer when you are not using them. 
Lowering the inactivity timeouts shortens the period of time the computer waits before 
turning off the device.
3.7.2 Suspending Operation While Idle
Although the computer goes into Suspend mode automatically after a defined period of 
inactivity, you can reduce energy...

3-10  Operating Instructions 
3.7.4 Replacing the battery
If you have a spare, charged battery, you can do one of the following.
¨Insert a secondary battery into the modular bay.
¨If you already have a battery in the modular bay, you can replace the primary 
battery without turning off the computer.
¨If you cannot insert the spare battery into the modular bay, suspend operations 
to disk by pressing Fn+F2 and replace the battery. When you turn on the 
computer, the computer returns to the saved state....

                                                                                                              Theory of Operation  4-1  
4
Theory of Operation
4.1 Introduction
This section contains a general block diagram theory of operation description of the 
Extensa 660 Series Notebook Computers.
Note: Various internal components may change on future models and 
busses/bus speeds are subject to change.
4.2 Notebook Functional Overview
The Extensa 660 Series Notebooks consist of eight major functions...

4-2   Theory of Operation
Figure 4-1  Extensa Functional Block Diagram
Bank 1
8, 16MB
(DIMM)
PentiumP55CLM-166MHz
CORE CHIPUMC UM8891BF-N,
UM8892BF-N,
UM8886BF-N
VGA CHIP
C&T 65548
CRT ONLCMINVERTER
FLASH BIOS
256KB
PCMCIAOMEGA
82C094
KB
CONTROLLER
MITSUBISHI
M38813M4
SUPER I/O
NS PC87336VLJ
GLIDE PAD
EXT. KB/MOUSE
INTERNAL KB
CARD 1
CARD 0
FDD
HDD
PRINTER
CLOCK GEN
ICS
AV9154-43
ACADAPTERDC/DCCONVERTER
14.318MHz
24MHz
66MHz
14.318MHz XTAL
BATTERY IN
+3.45V
+5V
+12V
DC-IN
COM1
CD-ROM
(8X, 10X)
AC Input...

                                                                                                              Theory of Operation  4-3  
4.2.1 System Processor
The System Processor function for the notebook is implemented on the System Board  
in the form of an Intel Pentium P55CLM 166 MHz Super scalar 586 Processor Chip. 
The processor operates in conjunction with RAM and ROM Memory and other control 
logic to process software instructions (BIOS, DOS, Windows, and applications). The 
processor...

4-4   Theory of Operation
Controller (206) into a single 208 QFP package.
Major features of the System Logic Controller include:
¨System:
— Fully compatible with IBM PC/AT
— Supports PCI Bus-Master mode
— System Operation Voltage from 3V to 5.5V
— Three programmable non cacheable regions
— Flash ROM Boot block erase protection
— Supports general purpose I/O
— Hybrid Voltage
¨Integration:
— Built-in 206
— Built-in 146818A
— Built-in Memory Controller
¨Memory Controller:
— Supports ROM DOS up to 64 MB by...

                                                                                                              Theory of Operation  4-5  
— On Mode
— Doze Mode
— Sleep Mode
— Suspend Mode
— Auto Power Reduction Mode (APR)
— Word Processing Mode (WP)
— All Register Read/Writeable for 0V Suspend
— Microsoft APM Compatible
— Supports 0V Suspend
— Demand Driven Clock Control
— Supports Resume/Suspend Key
— Auto Wake-Up Function
— Three Low Battery Monitor Input
— System Operating Voltage from 3V to 5.5V
— Low...

4-6   Theory of Operation
external microphone and line inputs and headphone/speaker outputs.
The sound subsystem also includes a variety of  sound utilities that combine to 
provide additional multi-media functions:
4.2.6 Keyboard Subsystem
The keyboard subsystem, implemented on the Keyboard Assembly and the System 
Board Assemblies Board, consists of the following major sections:
¨Keyboard Assembly
¨Keyboard Scanner
¨Status LED Interface
4.2.7 Hard Disk Drive Subsystem
The Hard Disk Drive Subsystem,...

                                                                                                              Theory of Operation  4-7  
4.2.9 Power Subsystem
The notebook is equipped with a software/hardware monitored/controlled Power 
Subsystem that minimizes battery usage for prolonged battery operation and 
automatically recharges the batteries when the notebook is used with an AC adapter.
4.2.9.1 AC Power Adapter
The computer is equipped with a universal AC power adapter that converts AC voltage...