Acer Travelmate 740 Service Guide

Chapter 123
  
NOTE: DC-AC inverter is used to generate very high AC voltage, then support to LCD CCFT backlight user, 
and is also responsible for the control of LCD brightness.  Avoid touching the DC-AC inverter area while 
the system unit is turned on. 
NOTE: There is an EEPROM in the inverter, which stores its supported LCD type and ID code.  If you replace 
a new inverter or replace the LCD with a different brand, use Inverter ID utility to update the ID 
information.     DC-AC LCD Inverter...

24Chapter 1
 
Efficiency  It should provide an efficiency of 83% minimum, when measured at maximum 
load under 115V(60Hz).
Output Ratings (CV mode)
DC output voltage  +19.0V~20.0V
Noise + Ripple  300mvp-pmax (20MHz bandwidth)
Load  0 A (min.)       3.16 A (max.)
Output Ratings (CC mode)
DC output voltage +12V ~ +19V
Constant output 2.75 ± 0.2 A
Dynamic Output Characteristics
Turn-on delay time 2 sec. (@115Vac)
Hold up time 4 ms min. (@115 Vac input, full load)
Over Voltage Protection (OVP) 24 V
Short...

Chapter 125
Environmental Requirements
ItemSpecification
Temperature
Operating
+5~+35 
°C
Non-operating
-20~+60 
°C
Non-operating
-20~+60
 °C  (storage package)
Humidity
Operating 20% to 80% RH, non-condensing
Non-operating 20% to 90% RH, non-condensing (unpacked)
Non-operating 20% to 90% RH, non-condensing (storage package)
Vibration
Operating (unpacked) 5~25.6Hz: 0.38mm (peak to peak)
25.6~250Hz: 0.5G
Non-operating (unpacked) 5~27.1Hz: 0.6G
27.1Hz~50Hz: 0.41mm (peak to peak)
50~500Hz: 2.0G...

26Chapter 1
060, 064 Keyboard controller 38859 chip select
061 System speaker out
040B DMA controller-1
061 System speaker
070-071 Real-time clock and NMI mask
080-08F DMA page register
0A0-0A1 Interrupt controller-2
0C0-0DF DMA controller-2
0F0-0FF Numeric data processor
120-13F
180-18FPower management controller
170-177 2nd EIDE device (CD-ROM) select
1F0-1F7 1st EIDE device (hard drive) select
220-22F Audio 
240-24F Audio (optional)
278-27F Parallel port 3
2E8-2EF COM4
2F8-2FF COM2 or FIR (optional)...

Chapter 127
IRQ12 PS/2 device
IRQ13 Math processor
IRQ14 1st EIDE device (hard disk) 
IRQ15 2nd EIDE device (CD-ROM drive)
DMA Channel Assignment
DMA ChannelFunction
DRQ0 Reserved
DRQ1 Reserved
DRQ2 Floppy
DRQ3 Reserved
DRQ4 DMA controller
DRQ5 Reserved
DRQ6 Reserved
DRQ7 Reserved
IRQ Assignment Map
Interrupt ChannelFunction 

28Chapter 1 

Chapter 229
BIOS Setup Utility
The BIOS Setup Utility is a hardware configuration program built into your computer’s BIOS (Basic Input/
Output System).
Your computer is already properly configured and optimized, and you do not need to run this utility.  However, 
if you encounter configuration problems, you may need to run Setup.  Please also refer to Chapter 4 
Troubleshooting when problem arises.
To activate the BIOS Utility, press 
m during POST (while the TravelMate logo is being displayed)....

30Chapter 2
System Information
The System Information screen displays a summary of your computer hardware information.
NOTE: 
The screen above is a sample and may not reflect the actual data on your computer.  “X” may refer to a 
series of numbers and/or characters.
The following table describes the information in this screen.
The items in this screen are important and vital information about your computer.  If you experience computer 
problems and need to contact technical support, this data helps our...

Chapter 231
Basic System Settings
The Basic System Settings screen allows you to set the system date and time.
The following table describes the parameters in this screen.
ParameterDescriptionFormat
Date Sets the system date. DDD MMM DD, YYYY 
(day-of-the-week month day, year)
Time Sets the system time. HH:MM:SS (hour:minute:second)
Basic System Settings
Basic System SettingsBasic System Settings Basic System Settings                                Page 1/1
Date -----------------------------------
Time...

32Chapter 2
Startup Configuration
The Startup Configuration screen contains parameter values that define how your computer behaves on 
system startup.
The following table describes the parameters in this screen.  Settings in boldface
 are the default and 
suggested parameter settings.
Basic System Setting   
Basic System Setting   Basic System Setting    Basic System Setting                                     Page 1/1
Boot Display -------------------------------------
Screen Expansion...