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Acer Aspire X3950 Service Guide - Page 49

Remove the three screws A that secure the power supply module.

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7. Remove the three screws (A) that secure the power supply module. X3950 Screw (Quantity) #6-32 L5 BZN (3) Color Black 8. Lift the power supply module off the unit. X5950 Torque 5.5 to 6.5 kgf-cm Part No. 86.00J07.B60 X3950 X5950 Chapter 3 41

Section	Page
Table of Contents	7
System Tour	9
Features	9
System Components	11
Front Panel	11
Rear Panel	13
Internal Components	14
System LED Indicators	15
System Utilities	17
CMOS Setup Utility	17
Entering CMOS setup	18
Navigating Through the Setup Utility	18
Setup Utility Menus	19
System Disassembly	33
Disassembly Requirements	33
Pre-disassembly Procedure	34
Main Unit Disassembly	35
Removing the Side Panel	37
Removing the Front Bezel	38
Removing the Heatsink Fan Assembly	40
Removing the Processor	42
Removing the Optical Drive	44
Removing the Hard Disk Drive	47
Removing the Power Supply	48
Removing the Memory Modules	50
Removing an Expansion Card	51
Removing the Front I/O and Card Reader Boards	54
Removing the Mainboard	57
Removing the Top Bezel	59
System Troubleshooting	61
Hardware Diagnostic Procedure	61
System Check Procedures	62
Power System Check	62
System External Inspection	62
System Internal Inspection	62
Checkpoints	63
Viewing BIOS checkpoints	63
Bootblock Initialization Code Checkpoints	63
Bootblock Recovery Code Checkpoints	64
POST Code Checkpoints	65
DIM Code Checkpoints	67
ACPI Runtime Checkpoints	67
Error Messages	68
Memory	68
Boot	68
Storage Device	69
Virus Related	70
System Configuration	71
CMOS	72
Miscellaneous	72
USB eModule Error Messages	73
SMBIOS eModule Error Messages	73
CPU eModule Error Messages	73
MPS Table (Multi-processor) eModule Error Messages	73
Beep Codes	74
Index of Symptom-to-FRU Error Message	75
BIOS Recovery	80
Undetermined Problems	82
System Block Diagram and Board Layout	83
System Block Diagram	83
Mainboard Layout	84
FRU (Field Replaceable Unit) List	87
Exploded Diagram	88
X3950 FRU List	90
X5950 FRU List	98

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