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Acer Aspire M3985 Acer Aspire M3985 Desktop Service Guide - Page 52

Removing the Mainboard, Remove the eight screws that secure the mainboard to the chassis.

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Removing the Mainboard 1. Disconnect the front panel cable, front audio cable, USB cable and card reader cable from the main board, then take out the these cables from the cable retention clip. 2. Remove the eight screws that secure the mainboard to the chassis. Note:Circuit boards >10 cm² has been highlighted with the yellow rectangle as above image shows. Please detach the Circuit boards and follow local regulations for disposal. 44 Chapter 3

Section	Page
Aspire M3985 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	39
Removing the VGA Card	41
Removing the Hard Disk Drive	43
Removing the Optical Drive	45
Removing the System Fan	47
Removing the Power Supply	49
Removing the Memory Modules	51
Removing the Mainboard	52
Removing the Top Cover	55
Removing the Power Switch and LED Cable Assembly	57
Removing the Card Reader	58
Removing the Top USB and Audio I/O Assembly	59
Assembly Requirements	61
Assembly Procedure	62
Reinstalling the Processor	63
Reinstalling the Memory	64
Removing the Side Panel	65
Removing the Cage of Hard Disk Drive	66
Removing the PCI Cover	67
Reinstalling the Power Supply	68
Reinstalling the I/O Shielding	69
Reinstalling the MainBoard	70
Reinstalling the Optica Drive	72
Reinstalling the Hard Disk Drive	74
Reinstalling the VGA Card	76
Reinstalling the System Fan	78
Reinstalling the Heat Sink Fan Assembly	79
Reinstalling the Front Bezel	81
Reinstalling the Side Panel	83
System Troubleshooting	84
Hardware Diagnostic Procedure	84
System Check Procedures	85
Power System Check	85
System External Inspection	85
System Internal Inspection	85
Beep Codes	86
Checkpoints	87
Viewing BIOS checkpoints	87
Bootblock Initialization Code Checkpoints	87
Bootblock Recovery Code Checkpoints	89
BIOS Recovery	90
Jumper and Connector Information	93
M/B Placement	93
Jumper Setting	95
Internal header pin definition	98
Connector pin definition	101
FRU (Field Replaceable Unit) List	106
Aspire M3985 Exploded Diagram	107

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