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Acer Aspire M3420 Acer Aspire M3420 Desktop Service Guide - Page 110

Checking Jumper Settings, Jumper Settings

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Checking Jumper Settings The following illustration shows the location of the motherboard jumpers. Pin 1 is labeled. Jumper Settings Jumper CLR_CMOS Type 3-pin Description CLEAR CMOS Setting (default) 1-2: NORMAL 2-3: CLEAR Before clearing the CMOS, make sure to turn the system off. 102 Chapter 5

Section	Page
Aspire M3420 Service Guide	1
Revision History	2
Copyright	3
Disclaimer	4
Conventions	5
Table of Contents	7
System Tour	9
Features	9
Block Diagram	13
System Components	14
Front Panel	14
Rear Panel	15
Hardware Specifications and Configurations	16
Power Management Function(ACPI support function)	20
System Utilities	21
CMOS Setup Utility	21
Entering CMOS setup	22
Navigating Through the Setup Utility	22
Setup Utility Menus	23
Main	23
Advanced	24
Power	29
Security	30
Boot Options	31
Exit	32
System Disassembly and Assembly	33
Disassembly Requirements	33
Pre-disassembly Procedure	34
Removing the Side Panel	35
Removing the Front Bezel	36
Removing the Heat Sink Fan Assembly	37
Removing the Processor	40
Removing the VGA Card	42
Removing the Wireless Lan Card	44
Removing the Hard Disk Drive	45
Removing the Optical Drive	48
Removing the Power Supply	52
Removing the Memory Modules	54
Removing the Daughter Board	55
Removing the Mainboard	58
Removing the Top Cover	61
Removing the Power Switch and LED Cable Assembly	64
Removing the Card Reader	65
Removing the Top USB and Audio I/O Cable Assembly	66
Assembly Requirements	69
Assembly Procedure	70
Removing the Side Panel	71
Removing the Cage of Hard Disk Drive	72
Removing the Daughter Board	73
Removing the PCI Cover	74
Reinstalling the I/O Shielding	75
Reinstalling the MainBoard	76
Install the Daughter Board	78
Reinstalling the Memory	79
Reinstalling the Power Supply	81
Reinstalling the System FAN	83
Reinstalling the Optica Drive	84
Reinstalling the Hard Disk Drive	86
Install the Wireless LAN Card	89
Reinstalling the VGA Card	90
Reinstalling the Processor	91
Reinstalling the Heat Sink Fan Assembly	93
Reinstalling the Front Bezel	95
Reinstalling the Side Panel	97
System Troubleshooting	98
Hardware Diagnostic Procedure	98
System Check Procedures	99
Power System Check	99
System External Inspection	99
System Internal Inspection	99
Beep Codes	100
Checkpoints	101
Viewing BIOS checkpoints	101
Bootblock Initialization Code Checkpoints	101
Bootblock Recovery Code Checkpoints	103
BIOS Recovery	104
Jumper and Connector Information	107
M/B Placement	107
Jumper Setting	109
Setting Jumper	109
Checking Jumper Settings	110
Internal Header Pin Definition	111
Connector Pin Definition	114
FRU (Field Replaceable Unit) List	118
Aspire M3420 Exploded Diagram	119

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