Acer Travelmate 720 Service Guide

							Chapter 1 23
Pack capacity (mAH) 3200
Cell voltage (V) 3.7
Number of battery call 8
Package configuration 2P-4S
Package voltage (V) 14.8V
Charger
ItemSpecification
Vendor & model name T62.085.C.00
Input voltage (from adapter, V) 7V-24V
Output current (to DC/DC converter, A) 3.5
Battery Low Voltage Li-ion
Battery Low 1 level (V) 11.41V
Battery Lower 2 level (V) 10.94V
Battery Low 3 level (V) 9.9V
Charge Current
Backgound charge (charge even system is still 
operative)Constant power 30W
Normal charge (charge while system is not 
operative)Constant power 45W
Charging Protection
Maximum temperature protection  60
DC-DC Converter
ItemSpecification
Vendor & model name Ambit T62.085.C.00
Input voltage (Vdc) 8~21
Output rating 5V 3.3V +12V 6V 3.3VS
B
Current (w/load, A) 0~5.8 0~3.3 0~0.12 0~0.1 0.01
Voltage ripple (max., 
mV)50 50 100 300 75
Voltage noise (max., 
mV)100 100 200 500 200
OVP (Over Voltage 
Protection, V)5.52~5
.553.642~
3.69315~17 7~9 -
Battery
ItemSpecification
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							24 System Specifications
DC-AC inverter is used to generate very high AC voltage, to support the LCD 
CCFT backlight user, and it is also responsible for the control of LCD 
brightness. Avoid touching the DC-AC inverter area while the system unit is 
turned on.
OCP (Over Current 
Protection, A)4~6 4~6 0.3~0.
4--
DC-AC Inverter
ItemSpecification
Vendor & model 
nameAmbit T62.086.C(12.1”) T622.087.C.00 (13.3” &14.1”)
Input voltage (V) 7.3 (min) - 22 (max)
Input current 
(mA)- - 700 (max)
Output voltage 
(Vrms, no load)1300 (min) 155 1600 (max)
Output voltage 
frequency (kHz)40 (min) - 65 (max)
Output current 
(mArms)
(T62.087.C.00)0.7~5.9 (min) 1.0~6.5 (typ) 1.3~7.1 (max)
Output current 
(mArms)
(T62.086.C.00)0.6~5.4 (min) 1.0~6.0 (typ) 1.4~6.6 (max)
LCD
ItemSpecification
Vendor & model name LG LP141X3 Hitachi 
TX34D62VC1CAC
Mechanical Specifications
LCD display area (diagonal, 
inch)14.1 13.3
Display technology TFT TFT
Resolution XGA
(1024x768)XGA (1024x768)
Support colors 66i
Optical Specification
Contrast ration 150 (typ) 100 (typ)
Brightness (cd/m2) 130 (typ) 100 (typ)
DC-DC Converter
ItemSpecification
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							Chapter 1 25
Brightness control Keyboard hotkey Keyboard hotkey
Contrast control None None
Electrical Specification
Supply voltage for LCD display 
(V)3.3 (typ) 3.3 (typ)
Supply voltage for LCD 
backlight (Vrms)730 (typ) 650 (typ)
AC Adapter
ItemSpecification
Vendor & model name Delta ADP-60HB
Lite-On PA-1600-19
Input Requirements
nominal voltages 
(Vrms)90~270
Frequency variation 
range (Hz)47~63
Maximum input current 
(A, @90Vac, full load)1.5A
Inrush current The maximum inrush current will be less than 50A and 
100A when the adapter is connected to 115Vac (60Hz) 
and 230Vac(50Hz) respectively.
Efficiency It should provide an efficiency of 83% minimum, when 
measured at maximum load under 115V (60Hz) & 
230Vac (60Hz)
Output Ratings (CV mode)
DC output voltage (V) +19.0V~20.5V
Noise + Ripple (mV) 300mvp-pmax (20Mhz bandwidth)
Output Ratings (CC mode)
Load (A) 0 (min) 3.16 (max)
Dynamic output Characteristics
Turn-on delay time (s, 
@115Vac)2
Hold up time (ms; 
@115 Vac input, full 
load)8 (min)
Over voltage protection 
(OVP, V)26
Short circuit protection Output can be shorted without damage
LCD
ItemSpecification
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							26 System Specifications
Weights and Dimension
Electrostatic discharge 
(ESD, kV)+-15 (at air discharge)
Dielectric withstand voltage
Primary to secondary 3000 Vac (or 4242 Vdc), 10mA for 1 second
Leakage current 0.25 mA maximum @ 254 Vac, 60Hz
Regulatory Requirements
Internal filter meets:
FCC class B requirements. (USA)
VDE 243/1991 class B requirements. (German)
CISPR 22 Class B requirements. (Scandinavia)
VCCI class II requirements. (Japan)
ItemSpecification
Weight 3.27 kg. 
Dimension 315~317 x 251~ 257 x 44~47 mm.
AC Adapter
ItemSpecification
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							Chapter 1 27
Power Management
This computer has a built-in power management unit that monitors system 
activity. System activity refers to any activity involving one or more of the 
following devices: keyboard, mouse, drive, hard disk, peripherals connected 
to the serial and parallel ports, and video memory. If no activity is detected for 
a period of time (called an inactivity time-out), the computer stops some or all 
of these devices in order to conserve energy.
This computer employs a power management scheme that supports APM 
(Advanced Power Management) or ACPI (Advanced Configuration and 
Power Interface) which allows for maximum power conservation and 
maximum performance at the same time.
If your computer is set for APM, you can set time-out values for your 
computer’s devices before power-saving methods are applied to these 
devices. If your computer is set for ACPI, Windows 98 handles all power-
saving chores for your computer.
Note: 
Power management (APM or ACPI) greatly prolongs your battery 
life.
Power Management Modes
Display Standby Mode
Screen activity is determined by the keyboard, the built-in touchpad, and an 
external PS/2 pointing device. If these devices are idle for the period 
specified by the LCD backlight Time-out value, the display shuts off until you 
press a key or move the touchpad or external mouse. 
Automatic Dim Feature
The computer has a unique automatic dim power-saving feature. When the 
computer is using AC power and you disconnect the AC adapter from the 
computer, it automatically dims the LCD backlight to save power. If you 
reconnect AC power to the computer, it automatically adjusts the LCD 
backlight to a brighter level.
Hard Disk Standby Mode
The hard disk enters Standby mode when there are no disk read/write 
operations within the period of time specified by the Hard Disk Time-out 
value. In this state, the power supplied to the hard disk is reduced to a 
minimum. The hard disk returns to normal once the computer accesses it.
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							28 System Specifications
Standby Mode
The computer consumes very low power in Standby mode. Data remain 
intact in the system memory until the battery is drained.
There are four ways to enter Standby mode:
TPressing the Standby hot key Fn-F3
TAllowing the waiting time specified by the Standby Time-out value or the 
operating system to elapse without any system activity
TClosing the display cover
TWhen the computer is about to enter Hibernation mode (e.g., during a 
battery low condition), but the Hibernation file is invalid or not present
Note: If the computer beeps but does not enter Standby mode after 
pressing the Standby hot key, it means the operating system will 
not allow the computer to enter the power-saving mode.
The following signals indicate that the computer is in Standby mode:
TThe buzzer beeps
TThe Standby indicator lights
Warning: Unstored data is lost when you turn off the computer power in 
Standby mode or when the battery is drained.
To leave Standby mode and return to normal mode:
TPress any key
TMove the active pointing device (internal or external, PS/2 or serial)
THave the resume timer set and let it be matched
TOpen the display cover
TExperience an incoming PC card modem event
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							Chapter 1 29
Hibernation Mode
In Hibernation mode, all power shuts off (the computer does not consume 
any power). The computer saves all system information onto the hard disk 
before it enters Hibernation mode. Once you turn on the power, the computer 
restores this information and resumes where you left off upon leaving 
Hibernation mode.
There is one necessary condition for the computer to enter Hibernation 
mode:
TThe Hibernation file created by PhDISK must be present and valid.
In this situation, there are four ways to enter Hibernation mode: 
TPressing the Hibernation hot key Fn-F4
TAllowing the waiting time specified by the S2D Time-out value to elapse 
without any system activity
TWhen a battery low condition occurs and the Battery Low Suspend 
parameter in Setup is set to [ENABLED].
TInvoked by the operating system power-saving modes
Note: If the computer beeps but does not enter Hibernation mode after 
pressing the Hibernation hot key, it means the operating system 
will not allow the computer to enter the power-saving mode.
To exit Hibernation mode, press the power switch. The computer also 
resumes from Hibernation mode if the resume timer is set and matched. The 
computer also resumes via the network if the Wake on LAN Access 
parameter is enabled.
Warning: Do not change any devices (such as add memory or swap 
hard disks) when the computer is in Hibernation mode.
Sleep Mode (ACPI)
If ACPI is installed, all power management functions are handled by the 
Windows 98 operating system. In this set-up, you do not need to set time-out 
values for devices before they enter a power-saving mode.
Sleep mode may be one of three computer power-saving modes: Standby, 
Hibernation or power off. Windows 98 automatically determines which of 
these modes to enter in.
To enter Sleep mode under ACPI:
TPressing the Sleep hot key Fn-F4
TAllowing idle times for devices and the computer determined by 
Windows 98 elapses
Exiting sleep mode depends on which power-saving mode the computer is 
currently in.
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							30 System Specifications
Advanced Power Management
This computer supports the APM standard designed to further reduce power 
consumption. APM is a power-management approach defined jointly by 
Microsoft and Intel. An increasing number of software packages support APM 
to take advantage of its power-saving features and to allow greater system 
availability without degrading performance.
For more information about APM under Windows 98, refer to your Windows 
98 user’s manual.
Advanced Configuration and Power Interface
Advanced Configuration and Power Interface (ACPI) is a power management 
specification jointly developed by Intel, Microsoft, and Toshiba. ACPI enables 
Windows 98 to control the amount of power given to each device attached to 
the computer. With ACPI, Windows 98 can turn off peripheral devices when 
they are not in use, thereby saving power.
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							Chapter 2 31
The computer comes preloaded with the following softwares:
TWindows 98 or Windows NT operating system
THardware BIOS setup utility
TSupport for LDCM (LANDesk Client Manager)
TSystem utilities, drivers and application software
Note: To access Windows 98 or Windows NT software applications, 
click on the Start button and select the application folder. Then 
click on the application icon to run the selected application. To 
learn about the software and utility, make use of the on-line help 
provided by the software.
Your computer is also compliant with the following:
TDMI (Desktop Management Interface) 2.1
TWfM (Wired for Management) 2.0
TAPM (Advanced Power Management) or ACPI (Advanced Configuration 
and Power Interface)
System Utilities
Chapter 2
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							32 System Utilities
PhDISK
The PhDISK utility allows your computer to enter Hibernation mode. Before 
entering Hibernation mode, your computer saves all necessary information 
into a file or partition created by PhDISK, then shuts off power to all system 
components. On the next start-up, the computer reloads the information from 
the PhDISK file or partition and resumes from where you left off.
Note: 
By default, this utility program is automatically loaded and set up 
on your computer, so you do not need to run it by yourself. You 
only need to run this program if you upgrade your memory. You 
can find PhDISK in the \windows\command directory.
Syntax
PHDISK [options]
where options:
T/CREATE (/FILE or /PARTITION) creates the hibernation file or partition
T/DELETE (/FILE or /PARTITION) deletes the hibernation file or partition
T/INFO displays information on the hibernation file or partition
T/REFORMAT PARTITION reformats the existing hibernation file or 
partition
    C a u t i o n
:   The Hibernation file is a hidden file named SAVE2DSK.BIN; DO         
                   NOT delete or alter this file in any way except by using the   
                   PhDISK utility. Improper deletion or alteration of this file could   
                   cause you to lose all access to your computer.
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