Dell OptiPlex 755 User Manual [en, de, es, fr, it]

Dell™ OptiPlex™ 755

Quick Reference Guide

Models DCTR, DCNE, DCSM, and DCCY

www.dell.com | support.dell.com

Notes, Notices, and Cautions

NOTE: A NOTE indicates important information that helps you make better use of

your computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data

and tells you how to avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury,

or death.

____________________

Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, OptiPlex, Inspiron, Dimension, Latitude, Dell

Precision, DellNet, TravelLite, OpenManage, PowerVault, Axim, PowerEdge, PowerConnect, PowerApp, and StrikeZone are trademarks of Dell Inc.; Intel, Pentium, SpeedStep, and Celeron are

registered trademarks and Core and vPro are trademarks of Intel Corporation in the U.S and other countries; Microsoft, MS-DOS, W indows, Windows V ista, and the W indows Vista Start b utton are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries; IBM is a registered trademark of International Business Machines Corporation; Bluetooth is a trademark owned by Bluetooth SIG, Inc. and is used by Dell Inc. under license. ENERGY STAR is a registered trademark of the U.S. Environmental Protection Agency . As an ENERGY ST AR partner, Dell Inc. has determined that this product meets the ENERGY ST AR guidelines for energy ef ficiency.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.

Models: DCTR, DCNE, DCSM, and DCCY

July 2007 FN392 Rev. A00

Finding Information . . . . . . . . . . . . . . . . . . . . 5

Setting Up Your Computer

Set Up Your Keyboard and Mouse Set Up Your Monitor Power Connections

. . . . . . . . . . . . . . . . 10

. . . . . . . . . 11

. . . . . . . . . . . . . . . . 12

Before You Begin . . . . . . . . . . . . . . . . . . . . 13

Recommended Tools Turning Off Your Computer Before Working Inside Your Computer

Mini Tower Computer

System Views Removing the Computer Cover Inside Your Computer System Board Components Jumper Settings

Desktop Computer

System Views Removing the Computer Cover Inside Your Computer System Board Components Jumper Settings

. . . . . . . . . . . . . . . . 13

. . . . . . . . . . . . . 13

. . . . . . . 14

. . . . . . . . . . . . . . . . . . 16

. . . . . . . . . . . . . . . . . . . . 16

. . . . . . . . . . . 22

. . . . . . . . . . . . . . . 24

. . . . . . . . . . . . 25

. . . . . . . . . . . . . . . . . . 26

. . . . . . . . . . . . . . . . . . . . 27

. . . . . . . . . . . 32

. . . . . . . . . . . . . . . 33

. . . . . . . . . . . . 35

. . . . . . . . . . . . . . . . . . 36

Small Form Factor Computer

System Views

. . . . . . . . . . . . . . . . . . . . 37

Removing the Computer Cover

. . . . . . . . . . . . . . 37

. . . . . . . . . . . 43

Contents 3

Inside Your Computer . . . . . . . . . . . . . . . . 44

System Board Components Jumper Settings

. . . . . . . . . . . . . . . . . . 47

. . . . . . . . . . . . . 46

Ultra Small Form Factor Computer

System Views

. . . . . . . . . . . . . . . . . . . . 48

Removing the Computer Cover Inside Your Computer Cable Cover (Optional)

System Board Components

Jumper Settings

Solving Problems

Dell Diagnostics System Lights Diagnostic Lights Beep Codes

. . . . . . . . . . . . . . . . . . . . . 70

. . . . . . . . . . . . . . . . 56

. . . . . . . . . . . . . . . 57

. . . . . . . . . . . . . . . 59

. . . . . . . . . . . . . . . . . . 60

. . . . . . . . . . . . . . . . . . . . 61

. . . . . . . . . . . . . . . . . . 61

. . . . . . . . . . . . . . . . . . . . 65

. . . . . . . . . . . . . . . . . . 66

Resolving Software and Hardware Incompatibilities

. . . . . . . . . . . . . . . . . . 72

Restoring Your Operating System Using Microsoft

Windows System Restore . . . . 73

Using Dell™ PC Restore and Dell Factory Image Restore

. . . . . . . . . . . . . . . . . . . 75

Using the Drivers and Utilities Media Reinstalling Drivers and Utilities

. . . . . . . . . . . 48

. . . . . . . . . . . 55

. . . . . . . . . 73

. . . . . . . 78

. . . . . . . . . . 79

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

4 Contents

Finding Information

NOTE: Some features or media may be optional and may not ship with your

computer. Some features or media may not be available in certain countries.

NOTE: Additional information may ship with your computer.

What Are You Looking For? Find It Here

• A diagnostic program for my computer

• Drivers for my computer

• Desktop System Software (DSS)

Drivers and Utilities Media

NOTE: The Drivers and Utilities media may

be optional and may not ship with your computer.

Documentation and drivers are already installed on your computer. You can use the media to reinstall drivers (see "Reinstalling Drivers and Utilities" on page 79), to run the Dell Diagnostics (see "Dell Diagnostics" on page 61).

Readme files may be included on your media to provide last-minute updates about technical changes to your computer or advanced technical-reference material for technicians or experienced users.

NOTE: Drivers and documentation updates

can be found at support.dell.com.

Quick Reference Guide 5

What Are You Looking For? Find It Here

• How to set up my computer

• How to run the Dell Diagnostics

• Error codes and diagnostic lights

• Tools and utilities

• How to set up a printer

• How to troubleshoot and solve problems

• How to remove and install parts

Owner’s Manual

NOTE: This document may be optional and

may not ship with your computer.

NOTE: This document is available as a PDF

at support.dell.com.

• Warranty information

• Terms and Conditions (U.S. only)

• Safety instructions

• Regulatory information

• Ergonomics information

• End User License Agreement

Dell™ Product Information Guide

• How to remove and replace parts

• Specifications

• How to configure system settings

• How to troubleshoot and solve problems

6 Quick Reference Guide

Dell™ OptiPlex™ User’s Guide

Microsoft Windows Help and Support Center

Click

Start

→

Help and

→

Support Guides

Click the computer.

Dell User and System

→

System Guides

User’s Guide

for your

What Are You Looking For? Find It Here

• Service Tag and Express Service Code

• Microsoft Windows License Label

Service Tag and Microsoft® Windows® License

These labels are located on your computer.

• Use the Service Tag to identify your computer when you use

support.dell.com

• Enter the Express Service Code to direct your call when contacting support.

NOTE: As an increased security measure,

the newly designed Microsoft Windows license label incorporates a missing portion or "hole" to discourage removal of the label.

or contact support.

Quick Reference Guide 7

What Are You Looking For? Find It Here

• Solutions — Troubleshooting hints and tips, articles from technicians, and online courses, frequently asked questions

Dell Support Website — support.dell.com

NOTE: Select your region or business

segment to view the appropriate support site.

• Community — Online discussion with other Dell customers

• Upgrades — Upgrade information for components, such as memory, the hard drive, and the operating system

• Customer Care — Contact information, service call and order status, warranty, and repair information

• Service and support — Service call status and support history, service contract, online discussions with technical support

• Dell Technical Update Service — Proactive e-mail notification of software and hardware updates for your computer

• Reference — Computer documentation, details on my computer configuration, product specifications, and white papers

• Downloads — Certified drivers, patches, and software updates

• Desktop System Software (DSS)— If you reinstall the operating system for your computer, you should also reinstall the DSS utility. DSS provides critical updates for your operating system and support for processors, optical drives, USB devices, and so on. DSS is necessary for correct operation of your Dell computer. The software automatically detects your computer and operating system and installs the updates appropriate for your configuration.

To download Desktop System Software:

Go to

support.dell.com

Drivers & Downloads.

Enter your Service Tag or Product Type and Product Model, and click

Scroll to

Utilities Software

Select

click

NOTE: The support.dell.com user interface

may vary depending on your selections.

and click

System and Configuration

→

Dell Notebook System

and click

Drivers & Downloads

Download Now

and

8 Quick Reference Guide

What Are You Looking For? Find It Here

• How to use Windows XP

• How to work with programs and files

• How to personalize my desktop

Windows Help and Support Center

To access Windows Help and Support:

• In Windows XP, click

Help and Support

• In Windows Vista™, click the Windows Vista Start button

Help and Support

click

Type a word or phrase that describes your problem, and then click the arrow icon.

Click the topic that describes your problem.

Follow the instructions on the screen.

• How to reinstall my operating system

Operating System Media

NOTE: The Operating System media may be

optional and may not ship with your computer.

The operating system is already installed on your computer. To reinstall your operating system, use the Operating System media. See "Restoring Your Operating System" in your User’s Guide or Owner’s Manual.

Start and click

and

Quick Reference Guide 9

What Are You Looking For? Find It Here

After you reinstall your operating system, use the Drivers and Utilities media to reinstall drivers for the devices that came with your computer.

Your operating system product key label is located on your computer.

NOTE: The color of your CD varies based

on the operating system you ordered.

Setting Up Your Computer

CAUTION: Before performing any of the procedures in this section, follow the

safety instructions in Product Information Guide.

NOTICE: If your computer has an expansion card installed (such as a modem

card), connect the appropriate cable to the card, not to the connector on the back panel.

NOTICE: To help allow the computer to maintain proper operating temperature,

ensure that you do not place the computer too close to a wall or other storage compartment that might prevent air circulation around the chassis. See your Product Information Guide for more information.

NOTE: Before you install any devices or software that did not ship with your

computer, read the documentation that came with the device or software, or contact the vendor to verify that the device or software is compatible with your computer and operating system.

You must complete all the steps to properly set up your computer. See the appropriate figures that follow the instructions.

NOTICE: Do not attempt to operate a PS/2 mouse and a USB mouse simultaneously.

Connect the keyboard and mouse.

NOTICE: Do not connect a modem cable to the network adapter connector.

Voltage from telephone communications can cause damage to the network adapter

Connect the modem or network cable.

Insert the network cable, not the telephone line, into the network connector. If you have an optional modem, connect the telephone line to the modem.

10 Quick Reference Guide

Connect the monitor.

Align and gently insert the monitor cable to avoid bending connector pins. Tighten the thumbscrews on the cable connectors.

NOTE: Some monitors have the video connector underneath the back of the

screen. See the documentation that came with your monitor for its connector locations.

Connect the speakers.

Connect power cables to the computer, monitor, and devices and connect the other ends of the power cables to electrical outlets.

NOTICE: To avoid damaging a computer with a manual voltage-selection switch,

set the switch for the voltage that most closely matches the AC power available in your location.

NOTICE: In Japan, the voltage selection switch must be set to the 115-V position

even though the AC power available in Japan is 100 V.

Verify that the voltage selection switch is set correctly for your location.

Your computer has a manual voltage-selection switch. Computers with a voltage selection switch on the back panel must be manually set to operate at the correct operating voltage.

Set Up Your Keyboard and Mouse

Quick Reference Guide 11

Set Up Your Monitor

Power Connections

12 Quick Reference Guide

Before You Begin

This chapter provides procedures for removing and installing the components in your computer. Unless otherwise noted, each procedure assumes that the following conditions exist:

• You have performed the steps in "Turning Off Your Computer" on page 13 and "Mini Tower Computer" on page 16.

• You have read the safety information in your Dell™

Guide.

• A component can be replaced by performing the removal procedure in reverse order.

Recommended Tools

The procedures in this document may require the following tools:

• Small flat-blade screwdriver

• Phillips screwdriver

• Flash BIOS update program floppy disk or CD

Turning Off Your Computer

NOTICE: To avoid losing data, save and close all open files and exit all open

programs before you turn off your computer.

Shut down the operating system:

Save and close all open files and exit all open programs.

In the Microsoft® Windows® XP operating system

Down

→ Shut down

Product Information

, click

Start→

Shut

In the Microsoft® Windows Vista™ operating system,

Windows Vista Start Button , in the lower-left corner of the desktop, click the arrow in the lower-right corner of the Start menu as shown below, and then click

The computer turns off after the operating system shutdown process is complete.

Shut Down

Quick Reference Guide 13

click the

NOTICE: Ensure that the computer and all attached devices are turned off. If your

computer and attached devices did not automatically turn off when you shut down your operating system, press and hold the power button for about 4 seconds to turn them off.

Before Working Inside Your Computer

Use the following safety guidelines to help protect your computer from potential damage and to help ensure your own personal safety.

CAUTION: Before you begin any of the procedures in this section, follow the

safety instructions in the Product Information Guide.

CAUTION: Handle components and cards with care. Do not touch the components

or contacts on a card. Hold a card by its edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by its pins.

NOTICE: Only a certified service technician should perform repairs on your

computer. Damage due to servicing that is not authorized by Dell is not covered by your warranty.

NOTICE: When you disconnect a cable, pull on its connector or on its strain-relief

loop, not on the cable itself. Some cables have a connector with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.

NOTICE: To avoid damaging the computer, perform the following steps before you

begin working inside the computer.

Turn off your computer.

If the computer is connected to a docking device (docked), undock it. See the documentation that came with your docking device for instructions.

NOTICE: To disconnect a network cable, first unplug the cable from your computer

and then unplug it from the network wall jack.

Disconnect all telephone or network cables from the computer.

Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.

If applicable, remove the computer stand (for instructions, see the documentation that came with the stand) and the cable cover, if attached (see "Cable Cover (Optional)" on page 57).

14 Quick Reference Guide

CAUTION: To guard against electrical shock, always unplug your computer from

the electrical outlet before removing the cover.

Remove the computer cover.

• For a mini tower computer, see "Removing the Computer Cover" on

page 22.

• For a desktop computer, see "Removing the Computer Cover" on

page 32.

• For a small form factor computer, see "Removing the Computer

Cover" on page 43.

• For an ultra small form factor computer, see "Removing the Computer

Cover" on page 55.

NOTICE: Before touching anything inside your computer, ground yourself by

touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.

Quick Reference Guide 15

Mini Tower Computer

System Views

Front View

1 5.25-inch drive

bay

2 5.25-inch drive

bay

Can contain an optical drive. Insert a CD or DVD (if supported) into this drive.

16 Quick Reference Guide

3 3.5-inch drive

bay

4 USB 2.0

connectors (2)

5 LAN indicator

light

6 diagnostic lights Use the lights to help you troubleshoot a computer problem

7 power button Press this button to turn on the computer.

Can contain an optional floppy drive or optional media card reader.

Use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or for bootable USB devices (see your online User’s Guide for more information on booting to a USB device).

It is recommended that you use the back USB connectors for devices that typically remain connected, such as printers and keyboards.

This light indicates that a LAN (local area network) connection is established.

based on the diagnostic code. For more information, see "Diagnostic Lights" on page 66.

NOTICE: To avoid losing data, do not turn off the

computer by pressing the power button. Instead, perform an operating system shutdown. See

Off Your Computer

NOTICE: If your operating system has ACPI enabled,

when you press the power button the computer will perform an operating system shutdown.

" on page 13 for more information.

"Turning

Quick Reference Guide 17

8 power light The power light illuminates and blinks or remains solid to

indicate different operating modes:

• No light — The computer is turned off.

• Steady green — The computer is in a normal operating state.

• Blinking green — The computer is in a power-saving mode

• Blinking or solid amber — The computer is receiving electrical power, but an internal power problem may exist

9 hard drive

activity light

10 headphone

connector

11 microphone

connector

(see "Power Problems" in the

To exit from a power-saving mode, press the power button or use the keyboard or the mouse if it is configured as a wake device in the Windows Device Manager. For more information about sleep modes and pwoer-saving mode, see "Advanced Features’ in the User’s Guide.

See "Diagnostic Lights" on page 66 for a description of light codes that can help you troubleshoot problems with your computer.

This light flickers when the hard drive is being accessed.

Use the headphone connector to attach headphones and most kinds of speakers.

Use the microphone connector to attach a microphone.

User’s Guide

18 Quick Reference Guide

Back View

1 cover-release

latch

2 padlock ring Insert a padlock to lock the computer cover.

This latch allows you to open the computer cover.

Quick Reference Guide 19

3 voltage selection

switch

4 power connector Insert the power cable.

5 back panel

connectors

6 card slots (4) Access connectors for any installed PCI or PCI Express cards,

Your computer is equipped with a manual voltage-selection switch. To help avoid damaging a computer with a manual voltage-selection switch, set the switch for the voltage that most closely matches the AC power available in your location.

NOTICE: In Japan, the voltage selection switch must be

set to the 115-V position.

Also, ensure that your monitor and attached devices are electrically rated to operate with the AC power available in your location.

Plug serial, USB, and other devices into the appropriate connectors. See "Back Panel Connectors" on page 20.

PS/2 connector, eSATA connector, etc.

Back Panel Connectors

98 7

1 parallel connector Connect a parallel device, such as a printer, to the parallel

connector. If you have a USB printer, plug it into a USB connector.

NOTE: The integrated parallel connector is automatically

disabled if the computer detects an installed card containing a parallel connector configured to the same address. For more information, see "System Setup Options" in the User’s Guide.

20 Quick Reference Guide

2 link integrity light

3 network adapter

connector

4 network activity

light

5 line-out

connector

6 line-

in/microphone connector

7 USB 2.0

connectors (6)

• Green — A good connection exists between a 10-Mbps network and the computer.

• Orange — A good connection exists between a 100-Mbps network and the computer.

• Yellow — A good connection exists between a 1-Gbps (or 1000-Mbps) network and the computer.

• Off — The computer is not detecting a physical connection to the network.

To attach your computer to a network or broadband device, connect one end of a network cable to either a network jack or your network or broadband device. Connect the other end of the network cable to the network adapter connector on the back panel of your computer. A click indicates that the network cable has been securely attached.

NOTE: Do not plug a telephone cable into the network

connector.

Remote management features require use of the onboard NIC.

It is recommended that you use Category 5 wiring and connectors for your network. If you must use Category 3 wiring, force the network speed to 10 Mbps to ensure reliable operation.

Flashes a yellow light when the computer is transmitting or receiving network data. A high volume of network traffic may make this light appear to be in a steady "on" state.

Use the green line-out connector to attach headphones and most speakers with integrated amplifiers.

Use the blue and pink line-in/microphone connector to attach a record/playback device such as a cassette player, CD player, or VCR.; or a personal computer microphone for voice or musical input into a sound or telephony program.

Use the back USB connectors for devices that typically remain connected, such as printers and keyboards.

Quick Reference Guide 21

8 video connector Plug the cable from your VGA-compatible monitor into the

blue connector.

NOTE: If you purchased an optional graphics card, this

connector will be covered by a cap. Connect your monitor to the connector on the graphics card. Do not remove the cap.

NOTE: If you are using a graphics card that supports dual

monitors, use the y-cable that came with your computer.

9 serial connector Connect a serial device, such as a handheld device, to the

serial port. The default designations are COM1 for serial connector 1 and COM2 for serial connector 2.

For more information, see "System Setup Options" in the User’s Guide.

Removing the Computer Cover

CAUTION: Before you begin any of the procedures in this section, follow the

safety instructions located in the Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from

the electrical outlet before removing the computer cover.

Follow the procedures in "Before You Begin" on page 13.

Lay the computer on its side as shown in the illustration.

Locate the cover release latch shown in the illustration. Then, slide the release latch back as you lift the cover.

Grip the sides of the computer cover and pivot the cover up using the hinge tabs as leverage points.

Remove the cover from the hinge tabs and set it aside on a soft nonabrasive surface.

CAUTION: Graphics card heat sinks can become very hot during normal

operation. Ensure that a graphics card heat sink has had sufficient time to cool before you touch it.

22 Quick Reference Guide

1 security cable slot 2 cover release latch

3 padlock ring

Quick Reference Guide 23

Inside Your Computer

CAUTION: Before you begin any of the procedures in this section, follow the

safety instructions located in the Product Information Guide.

CAUTION: To avoid electrical shock, always unplug your computer from the

electrical outlet before removing the computer cover.

NOTICE: Be careful when opening the computer cover to ensure that you do not

accidentally disconnect cables from the system board.

1 optical drive 2 disk drive

3 power supply 4 optional chassis-intrusion

5 system board 6 heat sink assembly

7 hard drive

24 Quick Reference Guide

switch

System Board Components

14 12

Quick Reference Guide 25

910

1 speaker connector (INT_SPKR) 12 RTC reset jumper (RTCRST)

2 fan (FAN_CPU) 13 intrusion switch connector

(INTRUDER)

3 processor connector (CPU) 14 battery socket (BATTERY)

4 processor power connector

(12VPOWER)

5 memory module connectors

(DIMM_1, DIMM_2, DIMM_3, DIMM_4)

6 password jumper (PSWD) 17 PCI connector (SLOT2)

7 SATA drive connectors (SATA0,

SATA1, SATA2, SATA3)

8 front-panel connector (FRONTPANEL) 19 serial connector (SERIAL2)

9 power connector (POWER) 20 system board speaker (BEEP)

10 external SATA connector (eSATA) 21 aux power LED (AUX_LED)

11 internal USB (INT_USB) 22 floppy connector (DSKT)

15 PCI Express x16 connector (SLOT1)

16 PCI Express x1 connector (SLOT4)

18 PCI connector (SLOT3)

Jumper Settings

Jumper Setting Description

PSWD Password features are enabled

(default setting).

Password features are disabled.

26 Quick Reference Guide

Jumper Setting Description

RTCRST The real-time clock has not been

reset.

jumpered unjumpered

The real-time clock is being reset (jumpered temporarily).

Desktop Computer

System Views

Front View

1 USB 2.0

connectors (2)

2 LAN indicator

light

Use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or for bootable USB devices (see "System Setup" more information about booting to a USB device).

It is recommended that you use the back USB connectors for devices that typically remain connected, such as printers and keyboards.

This light indicates that a LAN (local area network) connection is established.

514611 10

in the

User’s Guide

for

Quick Reference Guide 27

3 power button Press this button to turn on the computer.

NOTICE: To avoid losing data, do not turn off the

computer by pressing the power button. Instead, perform an operating system shutdown. See "Turning Off Your Computer" in the User’s Guide for more information.

NOTICE: If your operating system has ACPI enabled,

when you press the power button the computer will perform an operating system shutdown.

4 Dell badge This badge can be rotated to match the orientation of your

computer. To rotate, place fingers around the outside of the badge, press firmly, and turn the badge. You can also rotate the badge using the slot provided near the bottom of the badge.

5 power light The power light illuminates and blinks or remains solid to

indicate different operating states:

• No light — The computer is turned off.

• Steady green — The computer is in a normal operating state.

• Blinking green — The computer is in a power-saving mode.

• Blinking or solid amber — See "Power Problems" in the

User’s Guide

Vista" in the

See "Diagnostic Lights" on page 66 for a description of light codes that can help you troubleshoot problems with your computer.

6 diagnostic lights Use the lights to help you troubleshoot a computer

problem based on the diagnostic code. For more information, see "Diagnostic Lights" on page 66.

7 hard drive

activity light

This light flickers when the hard drive is being accessed.

"Power Management for Windows XP and

User’s Guide

28 Quick Reference Guide

8 headphone

connector

9 microphone

connector

10 3.5-inch drive

bay

11 5.25-inch drive

bay

Back View

Use the headphone connector to attach headphones and most kinds of speakers.

Use the microphone connector to attach a microphone.

Can contain an optional floppy drive, second hard drive, or optional media card reader.

Can contain an optical drive. Insert a CD or DVD (if supported) into this drive.

1 card slots (3) Access connectors for any installed PCI or PCI Express

2 3 4 6

cards, PS/2 connector, eSATA connector, etc.

NOTE: The back view of the system will be different if a riser is

installed.

2 back panel

connectors

3 power connector Insert the power cable.

Plug serial, USB, and other devices into the appropriate connectors (see "Back Panel Connectors" on page 30).

Quick Reference Guide 29

4 voltage selection

switch

5 padlock ring Insert a padlock to lock the computer cover.

6 cover-release

latch

Your computer is equipped with a manual voltage selection switch. To help avoid damaging a computer with a manual voltage selection switch, set the switch for the voltage that most closely matches the AC power available in your location.

NOTICE: In Japan, the voltage selection switch must be

set to the 115-V position.

Also, ensure that your monitor and attached devices are electrically rated to operate with the AC power available in your location.

Allows you to open the computer cover.

Back Panel Connectors

98 7

1 parallel connector Connect a parallel device, such as a printer, to the parallel

connector. If you have a USB printer, plug it into a USB connector.

NOTE: The integrated parallel connector is automatically

disabled if the computer detects an installed card containing a parallel connector configured to the same address. For more information, see "System Setup Options" in the User’s Guide.

30 Quick Reference Guide

+ 498 hidden pages

Dell OptiPlex 755 User Manual [en, de, es, fr, it]

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Finding Information

Setting Up Your Computer

Set Up Your Keyboard and Mouse

Set Up Your Monitor

Power Connections

Before You Begin

Recommended Tools

Turning Off Your Computer

Before Working Inside Your Computer

Mini Tower Computer

System Views

Removing the Computer Cover

Inside Your Computer

System Board Components

Jumper Settings

Desktop Computer

System Views