Acer Aspire 4520 Service Guide

Chapter 135
 
Mono or Stereo Stereo
Resolution 18 bit stereo full duplex
Compatibility HD audio Interface; S/PDIF output for PCM or AC-3 content
Sampling rate 44.1k/48k/96k/192kHZ sample rate
Internal microphone Yes
Internal speaker / Quantity Yes/2(1.5W speakers) 
Supports PnP DMA channel DMA channel 0
DMA channel 1
Supports PnP IRQ IRQ10, IRQ11
USB Port
ItemSpecification
Chipset Integrated with MCP67M chipset
USB Compliancy Level 2.0
OHCI USB 1.1 and USB 2.0 Host controller
Number of USB ports 4...

36Chapter 1
 
Total number of keypads 88-/89-key
Windows logo key Yes
Internal & external keyboard work 
simultaneouslyPlug USB keyboard to the USB port directly: Yes
Battery
ItemSpecification
Vendor & model name BATTERY PACK SANYO LI-ION 6  CELL 2.0/2.4, 2000MAH/2400MAH
BATTERY PACK SONY LI-ION 6 
CELL 2.0/2.4, 2000MAH/2400MAH
BATTERY PACK SIMPLO LI-ION 6 
CELL 2.0/2.4, 2000MAH/2400MAH
BATTERY PACK PANASONIC LI-
ION 6 CELL 2.0/2.4, 2000MAH/
2400MAH
Battery Type Li-ion
Pack capacity  2000MAH/2400MAH...

Chapter 137
Support Color 262K colors 
(RGB 6-bit data 
driver)262,144 262,144 262,144
Viewing Angle (degree)
Horizontal: Right/Left
Vertical: Upper/Lower 40/40
10/3045/45
15/3540/40
20/40 40/40
20/40
Temperature Range( C)
Operating
Storage (shipping) 0 to +50
-20 to +60
0 to +50
-25 to +600 to +50
-20 to +60 0 to +50
-20 to +60
LCD Inverter
ItemSpecification
Vendor & model name Darfon/V189-301GP
Brightness conditions N/A
Input voltage (V) 9~21
Input current (mA) 2.56 (max)
Output voltage (V, rms) 780V...

38Chapter 1 

Chapter 239
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 optimi zed, 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 (when “Press  to  enter Setup” message is prompted 
on...

40Chapter 2
Navigating the BIOS Utility
There are seven menu options: Info., Main, System Devices, Security, Power, Boot, and Exit.
Follow these instructions:
TTo choose a menu, use the cursor left/right keys ( zx).
TTo choose an option, use the cursor up/down keys ( wy).
TTo change an option format, press  por  q.
TA plus sign (+) indicates the item has sub-items. Press  e to expand this item.
TPress  ^ while you are in any of the menu options to go to the Exit menu.
TIn any menu, you can load default...

Chapter 241
Information
NOTE: The system information is su bject to different models.
ParameterDescription
CPU Type / CPU Speed This field shows the CPU type and speed of the system.
IDE1 Model Name This field shows the model na me of HDD installed on primary IDE master.
IDE1 Serial Number This field displays the seri al number of HDD installed on primary IDE master.
ATAPI Model Name This field displays the  model number of the installed ATAPI drive.
System BIOS Version Displays system BIOS version.
VGA...

42Chapter 2
Main
The Main screen displays a summary of your computer hardware information, and also includes basic setup 
parameters. It allows the user to specif y standard IBM PC AT system parameters.
NOTE:  The screen above is for your reference only. Actual values may differ.
  Information
 
 
Item Specific Help  
 
 
 
 
   
  
  
    
   
 ,  , or
 selects field.
 
 
F1         F5/F6
                  F9
 Setup Defaults 
Esc    Enter   Select  Sub-Menu F10 Save and Exit  
System Time: [19:03:49]...

Chapter 243
The table below describes the parameters in this screen. Settings in boldface are the default and suggested 
parameter settings.
NOTE:  The sub-items under each device will not be shown if t he device control is set to disable or auto. This is 
because the user is not allowed to control the settings in these cases.
ParameterDescriptionFormat/Option
System Time Sets the system time. The hours are displayed  with 24-hour format. Format: HH:MM:SS 
(hour:minute:second) System Time
System Date...

44Chapter 2
Security
The Security screen contains parameters that help safeguard and protect your computer from unauthorized 
use.
             
 
Item Specific Help 
Supervisor Password Is :
User Password Is : Clear
Set Supervisor Password
Set User Password
   Password on boot : [Enabled]
 
   
 
Supervisor Password 
controls access to the
setup utility.
 
 
 
F1   Help    Select Item     F5/F6 Change Values F9 Setup Defaults 
Esc  Exit       Select Menu Enter  Select    Sub -Menu  F10 Save and Exit...