Acer Aspire 2420 Service Guide

Chapter 251
Removing HDD Utility
This section provide you with removing HDD method:
Remove HDD Password:
If you key in wrong HDD password for three time, “HDD password error code” would display on the 
screen. See the image below.
If you need to solve HDD password locked problem, you can run unlock6.exe
1.
Key in “unlock6 03567 00””
2.Select “2”
3.Choose one upper-case string 

52Chapter 2
Reboot system and key in  N9H7W7I , 9HNXDDI ,BCIKFVX,TPFIK1K or Q918H7I to HDD 
user password. 

Chapter 353
This chapter contains step-by-step procedures on how to disassemble the notebook computer for 
maintenance and troubleshooting.
Disassembly Requirements
To disassemble the computer, you need the following tools:
Wrist grounding strap and conductive mat for preventing electrostatic discharge
Flat screwdriver
Philips screwdriver
Hex screwdriver
Plastic flat screwdriver
Plastic tweezers
NOTE: The screws for the different components vary in size. During the disassembly process, group the...

54Chapter 3
General Information
Pre-disassembly Instructions
Before proceeding with the disassembly procedure, make sure that you do the following:
1.Turn off the power to the system and all peripherals.
2.Unplug the AC adapter and all power and signal cables from the system. 
3.Place the system on a flat, stable surface. 
4.Remove the battery pack.
Disassembly Process
The disassembly process is divided into the following stages:
 External module disassembly
 Main unit disassembly
 LCD module...

Chapter 355
External Module Disassembly Process
External Modules Disassembly Flowchart
The flowchart below gives you a graphic representation on the entire disassembly sequence and instructs you 
on the components that need to be removed during servicing. For example, if you want to remove the main 
board, you must first remove the keyboard, then disassemble the inside assembly frame in that order.
Screw List
ItemScrewColorPart No.
A M2 x L3 Black 86.00D29.620
B M2 x L4 Black 86.00D68.620
C M3 x L4...

56Chapter 3
Removing the Battery Pack
1.Turn base unit over. 
2.Slide the battery lock/unlock latch to the unlock position. 
3.Slide and hold the battery release latch to the release position (1), then slide out the battery pack from the 
main unit (2). 
Removing the SD dummy card
1.Push the SD dummy card all the way in to eject it (1, 2). 

Chapter 357
2.Pull it out from the slot. 
Removing the ExpressCard dummy card
1.Push the ExpressCard dummy card all the way in to eject it. 
2.Pull it out from the slot.
Removing the Lower Cover
1.See “Removing the Battery Pack” on page 56. 

58Chapter 3
2.See “Removing the SD dummy card” on page 56.
3.See “Removing the ExpressCard dummy card” on page 57.
4.Remove the four screws (B) and loosen the five captive screws on the lower cover.   
5.Use a plastic screw driver to carefully pry open the lower cover. 
StepSize (Quantity)ColorTo r q u e
1~4 M2 x L12 (4) Black 1.6 kgf-cm 

Chapter 359
6.Remove the lower cover from the lower case. 
Removing the DIMM 
1.See “Removing the Battery Pack” on page 56.
2.See “Removing the SD dummy card” on page 56.
3.See “Removing the ExpressCard dummy card” on page 57.
4.See “Removing the Lower Cover” on page 57..
5.Push out the latches on both sides of the DIMM socket to release the DIMM.  

60Chapter 3
6.Remove the DIMM module. 
Removing the WLAN Board Modules
1.See “Removing the Battery Pack” on page 56.
2.See “Removing the SD dummy card” on page 56.
3.See “Removing the ExpressCard dummy card” on page 57.
4.See “Removing the Lower Cover” on page 57.
5.Disconnect the antenna cables from the WLAN board.