Acer Travelmate 4520 Service Guide

							Chapter 221
5.Peel off the black tape near the DIMM slot to expose the SW1 dip switch.
6.Locate the G41 pin. 
7.Short the G41 pin to clear all system passwords. 
8.Reinstall the memory modules and the lower case cover. 
9.Turn on the computer and press F2 during bootup to access the Setup Utility. 
10.Press F9 to load the system defaults. 
11 .Press F10 to save the changes you made and close the Setup Utility. 
To clear a lost HDD password:
It uses on dos environment. To decode HDD password error code for unlock hard disk. 
1.Open the computer in a DOS environment.
2.Type the following command: 
A\> unlock6 XXXXX  00
3.Press Enter to display the command options.
4.Select option 2 (upper case ASCII code), then press Enter.
5.Write down the generated master password. 
6.Reboot the computer. 
7.In the HDD password prompt, type the master password generated in step 4, then press Enter.
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							22Chapter 2
Boot
The Boot menu screen allows users to set the drive sequence in which Setup attempts to boot the operating 
system. By default, Setup searches for boot devices in the order shown in the screen below.
To set the boot drive sequence:
1.Press   or   to select a bootable device. 
2.Press F6 to move the device up the list, or F5 to move it down the list.
3.Press F10 to save the changes you made and close the Setup Utility. 
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							Chapter 223
Exit
The Exit menu displays the several options on how to quit from the Setup Utility. Select any of the exit options
then press Enter.
OptionDescription
Exit Saving Changes Saves changes made and closes the Setup Utility. 
Keyboard shortcut: F10·
Exit Discarding Changes Discards changes made and closes the Setup Utility.
Load Setup Defaults   Loads the factory-default settings for all Setup fields. 
Keyboard shortcut: F9
Discard Changes Discards all changes made to the Setup Utility and loads the previous 
configuration settings.
Save Changes Saves all changes made to the Setup Utility.
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							24Chapter 2
BIOS Flash Utility
The BIOS flash memory update is required under the following conditions:
TWhen there are new versions of system programs
TWhen new hardware options are installed
TWhen the BIOS has been corrupted and you need to restore it 
BIOS Flash Precautions
TIf you do not have a crisis recovery diskette at hand, create a Crisis Recovery Diskette in Windows XP 
of Vista before you use the flash utility.
TDo not install memory-related drivers (XMS, EMS, DPMI) when you use the flash utility.
TPlace the computer in AC mode during the BIOS flash procedure. If the battery pack does not contain 
enough power to finish the BIOS flash, you may not able to boot the system because the BIOS is not 
completely loaded. 
To flash the BIOS:
1.Prepare a bootable diskette.
2.Copy the flash utilities to the bootable diskette.
3.Boot the system from the bootable diskette. 
The flash utility will automatically be executed.
4.Follow the on-screen instructions to finish the flashing of the BIOS.
BIOS Recovery
If a BIOS flash procedure fails to complete, perform a BIOS recovery procedure by using the Crisis Recovery 
Diskette. During this procedure, the system will force the BIOS to enter a special BIOS block, called boot 
block, to boot up the system with minimum BIOS initialization. 
To perform BIOS recovery:
1.Make sure the power cord is connected to the computer.
1.Attached a USB floppy drive to the computer.
2.Insert the Crisis Recovery Diskette into the floppy drive.
3.Press and hold the Fn+Esc keys, then press the power button  . 
This initialize the BIOS recovery process. The boot block BIOS will start to restore the failed BIOS code. 
Short beeps should be heard during this process. Once the process is completed, a long beep should be 
heard.
4.Turn off the computer once the process is complete.
5.Turn on the computer again and flash the BIOS. Refer to the previous instructions. 
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							Chapter 225
Launch Manager 
Launch Manager allows users to configure three of the easy-launch keys—Acer Empowering, Web browser, 
and Mail.  
To configure an easy-launch key:
1.Select Start | All Programs | Launch Manager.
2.Select which key to configure, then click the Add button opposite it. 
3.You can set the key to open a particular file or program, or display a Web site address. Select the 
corresponding radio button, then type or browse for your selection.
4.If you’ve entered a Web site address, key in a descriptive label for the new easy-launch key function.
5.Click OK.
6.Click OK to save the new settings. 
Acer TM 4520 SG.book  Page 25  Friday, June 22, 2007  5:43 PM 
						

							26Chapter 2
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							Chapter 327
This chapter provides step-by-step instructions on how to disassemble the notebook computer for 
maintenance and troubleshooting purposes.
Disassembly Tools
In performing the disassembly process, you will need the following tools:
TWrist-grounding strap and conductive mat for preventing electrostatic discharge
TPhilips screwdriver
TFlat screwdriver
THex screwdriver
TFlat plastic screwdriver
TPlastic tweezers
Stages of the Disassembly Process
The disassembly process is divided into three stages:
1.External modules disassembly
2.Main unit disassembly
a.Upper case disassembly
b.Lower case disassembly
3.LDC module disassembly
IMPORTANT:  The disassembly procedure described in this chapter is a gradual process, as illustrated in the 
flowcharts preceding each disassembly stage section. This means that users need to observe 
the instructions in a step-by step manner. To illustrate, removing the HDD assembly will require 
that you first remove the battery pack and the stylus. Failure to observe the gradual flow of the 
process may result in component damage.  
NOTE: To reinstall the system components and assemble the unit, perform the disassembly procedures 
in reverse.
Equivalent Torque Values
Torque values indicated in this chapter are expressed in kgf-cm (kilogram force-centimetre). For equivalent 
values in in-lb (inch-pound force) and Nmm (milli Newton meter), refer to the table below. 
Torque Unitskgf-cmin-lbNmm
To r q u e  
values1.6 1.39 156.91
32.60294.21
43.47392.28
System Disassembly
Chapter 3
 
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							28Chapter 3
System Screw List
Listed below are the screw types used in this system, plus their corresponding part numbers.
NOTE:  The screws for the different components vary in size. During the disassembly process, group the  
screws with their corresponding components to avoid mismatches when putting back the components.
Pre-disassembly Procedure
Before proceeding with the disassembly procedure, perform the steps listed below:
1.Turn off the power to the computer and all peripherals.
2.Unplug the power cord from the computer.
3.Unplug all peripheral cables from the computer.
4.Close the notebook lid and place the computer on a flat, steady surface.
ScrewTy p eColorPart Number
AM2 x L8 BZN+NYLOK Black 86.00D75.220
BM2 x L4 BZN Black 86.00A02.140
CM2.5 x L8 BZN+NYLOK Black 86.00E34.738
DM2 x L4 BZN+NYLOK Black 86.00E13.524
EM3 x L4 Silver 86.9A554.4R0
FM2 x L3 BZN+NYLOK Black 86.00E25.723
GM2 x L2.5 BZN+NYLOK Black 86.00D72.620
HM2.5 x L12 BZN+NYLOK Silver 86.00E67.63C
IM2.5 x L4 BZN+NYLOK Black 86.00D30.630
JM2.5 x L6 BZN+NYLOK Black 86.00E33.736
KM2 X L2 NI Silver 86.00D77.320
LM2.5 x L5 BZN+NYLOK Black 86.00F19.735
MM2.5 x L3 BZN+NYLOK Black 86.00D52.630
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							Chapter 329
External Modules Disassembly
External Modules Disassembly Flowchart
ScrewTy p ePart Number
A M2 x L8 BZN+NYLOK 86.00D75.220
B M2 x L4 BZN 86.00A02.140
C M2.5 x L8 BZN+NYLOK 86.00E34.738
D M2 x L4 BZN+NYLOK 86.00E13.524
E M3 x L4 86.9A554.4R0
F M2 x L3 BZN+NYLOK 86.00E25.723
G M2 x L2.5 BZN+NYLOK 86.00D72.620
Turn off 
computer and 
disconnect 
power cord
S D dummy cardEXpressCard 
dummy cardBa tte r y pa c kL-case cover 
(Ax1, Bx7, Cx1)
DIM MWLAN board
(Dx2)HDD a s s e m bl y
Ha r d dr i ve  
shielding
(Ex2)
Ha r d dr i ve  
module
ODD a s s e m bl y
ODD br a c ke t
(Cx1)
ODD m o dul e
(Fx2)
Fan
(Dx1)
He a t s i nk
(Dx4, Gx5)
Processor
VGA board
(Fx2)
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							30Chapter 3
Removing the SD Dummy Card
1.Push against the card, as if you were pushing it further into the slot, letting the card spring out.  
2.Pull the SD dummy card out of its slot.
Removing the PC Card Dummy Card
1.Press the PC card slot eject button to pop it out, then press it again to eject the dummy card.
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