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Acer Extensa 4420 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 100

Category, Part Name and Description, Acer Part No., Cables

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Category No. Part Name and Description Acer Part No. Cables 90 Chapter 6

Section	Page
Features	11
TravelMate Tour	15
Open Front View	15
Close Front View	16
Left View	17
Right View	18
Rear View	18
Base View	19
Status Indicators	20
Easy-launch Keys	21
Productivity Keys	22
Phoenix TrustedCore Setup Utility	23
Accessing the Setup Utility	24
Navigating Through the Setup Utility	25
Setup Utility Menus	26
BIOS Flash Utility	34
Launch Manager	35
Disassembly Tools	37
Stages of the Disassembly Process	37
Equivalent Torque Values	37
System Screw List	38
Pre-disassembly Procedure	38
External Modules Disassembly	39
External Modules Disassembly Flowchart	39
Removing the SD Dummy Card	40
Removing the PC Card Dummy Card	40
Removing the Battery Pack	41
Removing the Lower Case Cover	42
Removing the Memory Modules	42
Removing the WLAN Board	43
Removing and Dismantling the HDD Assembly	44
Removing and Dismantling the ODD Assembly	46
Removing the Processor Cooling Fan	48
Removing the Heat Sink	49
Removing the Processor	50
Main Unit Disassembly	51
Main Unit Disassembly Flowchart	51
Removing the Middle Cover	52
Removing the Keyboard	52
Removing the LCD Module	53
Removing the Upper Case	57
Removing the LED Board	59
Removing the Fingerprint and Touchpad Boards	60
Removing the Card Reader Board	62
Removing the Bluetooth Board	63
Removing the System Board	64
Removing the Modem Board	65
Removing the Speakers	65
LCD Module Disassembly	67
LCD Module Disassembly Flowchart	67
Removing the LCD Bezel	68
Removing the Inverter Board	69
Removing the LCD Module Hinges	70
Removing the LCD Panel	70
Removing the LCD-CCD Cable	71
Removing the LCD Panel Brackets	72
Removing the Internal Microphone and the CCD Board	73
Removing the WLAN Antennas	74
Hardware Diagnostic Procedure	75
System Check Procedures	76
External Diskette Drive Check	76
External CD-ROM Drive Check	76
Keyboard or Auxiliary Input Device Check	76
Memory Check	77
Power System Check	77
Touchpad Check	78
POST Error Indicators	79
POST Error Message	79
POST Beep Codes	82
Index of Symptom-to-FRU Error Message	87
Intermittent Problems	90
Undetermined Problems	91
Online Support Information	92
System Block Diagram	93
System Board Layout	94
Top View	94
Bottom View	95
System Switch	96
Aspire 5910 Exploded Diagram	98
TravelMate 4520 FRU List	99
TravelMate 4520 Series Model Configurations	117
Test Compatible Components	123

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