Dell Dimension C521 Bedienungsanleitung

Dell™Dimension™C521ServiceManual

Before You Begin

About Your Computer

Technical Overview

Removing the Computer Cover

Specifications

Troubleshooting

System Setup

Removing and Installing Parts

Replacing the Computer Cover

Notes, Notices, and Cautions

Information in this document is subject to change without notice.

©2006DellInc.Allrightsreserved.

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

Trademarks used in this text: Dell, the DELL logo, and Dimension are trademarks of Dell Inc.; AMD, AMD Athlon, and combinations thereof, Sempron, and Cool 'n' Quiet are

trademarks of Advanced Micro Devices, Inc; Microsoft and Windows are registered trademarks of Microsoft Corporation.

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.

September 2006 Rev. A00

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.

Back to Contents Page

About Your Computer

Dell™Dimension™C521ServiceManual

Front View

Back View of the Computer

Back Panel I/O Connectors

Front View

cover release

latch

Use this latch to remove the cover. See Removing the Computer Cover.

Service Tag

Use to identify your computer when you access the Dell Support website

or call support.

FlexBay drive

Can contain an optional floppy drive or optional Media Card Reader.

CD or DVD

activity light

The drive light is on when the computer reads data from the CD or DVD

drive.

CD or DVD

eject button

Press to eject a disk from the CD or DVD drive.

microphone

connector

Use the microphone connector to attach a personal computer

microphone for voice or musical input into a sound or telephony

program.

headphone

connector

Use the headphone connector to attach headphones and most kinds of

speakers.

LAN activity

light

This light indicates that a LAN (Local Area Network) connection is

established.

diagnostic

lights (4)

Use the lights to help you troubleshoot a computer problem based on

the diagnostic code. For more information, see Diagnostic Lights.

USB 2.0

connectors (2)

Use the front USB connectors for devices that you connect occasionally,

such as joysticks or cameras, or for bootable USB devices. See System

Setup Options 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.

power button

Press to turn on the computer.

NOTICE: To avoid losing data, do not use the power button to

turn off the computer. Instead, perform an operating system

shutdown.

hard-drive

activity light

The hard drive activity light is on when the computer reads data from or

writes data to the hard drive. The light might also be on when a device

such as a CD player is operating.

vents

To ensure adequate cooling, do not block any of the vents.

Back View of the Computer

Back Panel I/O Connectors

NOTICE: Ensure that there is a minimum of two inches of space

between all vents and any object near these vents.

NOTICE: Keep the vent area clean and dust-free to ensure that

the system is adequately ventilated. Use only a dry cloth to clean

the vent area to avoid water damage to the system.

voltage selection

switch

See the safety instructions in the Product Information Guide for more

information.

power connector

Insert the power cable.

back panel I/O

connectors

Plug VGA, USB, and other devices into the appropriate connectors.

See Back Panel I/O Connectors.

card slots (3)

Access connector slots for expansion cards:

lSLOT1 PCI Express x16

lSLOT2 PCI Express x1

lSLOT3 PCI

link integrity light

lGreen —A good connection exists between a 10-Mbps

network and the computer.

lOrange —A good connection exists between a 100-Mbps

network and the computer.

lOff —The computer is not detecting a physical connection to

the network.

network adapter

connector



NOTICE: Do not plug a telephone cable into the network

connector.

Use the network adapter connector 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, and

then connect the other end of the network cable to the network

adapter connector on your computer. A click indicates that the

network cable has been securely attached.

On computers with an additional network connector card, use the

connectors on the card and on the back of the computer when

setting up multiple network connections (such as a separate intra-

and extranet).



Back to Contents Page



NOTE: 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.

network activity

light

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.

surround sound

connector

Use the (black) surround sound connector to attach multichannel-

capable speakers.

On computers with a sound card, use the connector on the card.

line-in connector

Use the (blue) line-in connector to attach a record/playback device

such as a cassette player, CD player, or VCR.

On computers with a sound card, use the connector on the card.

line-out/headphone

connector

Use the (green) line-out connector to attach headphones and most

speakers with integrated amplifiers.

On computers with a sound card, use the connector on the card.

microphone

connector

Use the (pink) microphone connector to attach a personal

computer microphone for voice or musical input into a sound or

telephony program.

On computers with a sound card, use the connector on the card.

center/subwoofer

LFE connector

Use the (orange) center/subwoofer connector to attach a center

speaker or a single subwoofer.

On computers with a sound card, use the connector on the card.



NOTE: The LFE (Low Frequency Effects) Audio channel, found in

digital surround sound audio schemes, carries only low frequency

information of 80 Hz and below. The LFE channel drives a

subwoofer to provide extremely low bass extension. Systems not

using subwoofers can shunt the LFE information to the main

speakers in the surround sound setup.

side surround

sound connector

Use the (gray) side surround sound connector to attach

multichannel-capable speakers. The side-surround output provides

enhanced surround audio for computers with 7.1 speakers.

On computers with a sound card, use the connector on the card.

USB 2.0 connectors

(4) (rear quad)

Use the back, rear-quad USB connectors for devices that typically

remain connected, such as printers and keyboards.



NOTE: It is recommended that you use the front USB connectors

for devices that you connect occasionally, such as joysticks,

cameras, or bootable USB devices.

VGA video

connector

If your monitor has a VGA connector, plug it into the VGA connector

on the computer.



NOTE: If your computer has an add-in video card, connect your

monitor to the add-in card's video connector.

Back to Contents Page

Before You Begin

Dell™Dimension™C521ServiceManual

Getting Started

Recommended Tools

Turning Off Your Computer

Before Working Inside Your Computer

Getting Started

This manual provides procedures for removing and replacing the components in your computer. Unless otherwise noted, each procedure assumes that the

following conditions exist:

lYou have performed the steps in Turning Off Your Computer and Before Working Inside Your Computer.

lYouhavereadthesafetyinformationinyourDell™Product Information Guide.

lA component can be replaced by performing the removal procedure in reverse order. Directional instructions are also performed on the reverse.

Recommended Tools

The procedures in this document may require the following tools:

lSmall flat-blade screwdriver

lPhillips #0, #1, and #2 screwdrivers

lFlash BIOS update program (download from support.dell.com)

Turning Off Your Computer



1. Shut down the operating system:

a. Save and close any open files, exit any open programs, click the Start button, and then click Shut Down.

b. In the Shut Down Windows window, select Shut Down.

The computer turns off after the operating system shutdown process finishes.



2. Ensure that the computer and any 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 4 seconds.

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.



1. Follow the steps in Turning Off Your Computer.

NOTICE: To avoid losing data, save and close any open files and exit any open programs before you turn off your computer.

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.



2. Disconnect any telephone or network cables from the computer.



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



4. Follow the steps in Removing the Computer Cover.

Back to Contents Page



NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network port or device.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.

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.

Back to Contents Page

Replacing the Computer Cover

Dell™Dimension™C521ServiceManual



1. Ensure that all cables are connected, and fold cables out of the way.

Gently pull the power cables toward you so that they do not get caught underneath the drives.



2. Ensure that no tools or extra parts are left inside the computer.



3. To replace the cover:

a. Align the bottom of the cover with the hinge tabs located along the bottom edge of the computer.

b. Using the hinge tabs as leverage, rotate the cover downward to close it.

c. Press the cover down until it snaps into place.

d. Ensure that the cover is seated correctly before moving the computer.



4. Connect your computer and devices to electrical outlets, and then turn them on.

Back to Contents Page



CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.

NOTICE: To connect a network cable, first plug the cable into the network port or device, and then plug it into the computer.

Back to Contents Page

Removing the Computer Cover

Dell™Dimension™C521ServiceManual



1. Follow the procedures in Before You Begin.



2. If you have installed a padlock through the padlock ring on the back panel, remove the padlock.



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



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



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

Back to Contents Page



CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.

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.

NOTICE: Ensure that sufficient space exists to support the removed cover—at least 30 cm (1 ft) of desk top space.

NOTICE: Ensure that you are working on a level, protected surface to avoid scratching either the computer or the surface on which it is resting.

computer cover

cover release latch

security cable slot

Back to Contents Page

Removing and Installing Parts

Dell™Dimension™C521ServiceManual

Memory

If your computer only has one memory module installed on the system board, you can increase your computer memory by installing an additional memory

module.

Your computer supports DDR2 memory. For additional information on the type of memory supported by your computer, see Specifications.



DDR2 Memory Overview

Your computer has a minimum memory configuration of one DDR2 memory module. This memory module must be installed in DIMM1. If two or more DDR2

memory modules are installed, they should be installed in pairs of matched memory size, speed, and technology. If the DDR2 memory modules are not installed in

matched pairs, the computer will continue to operate, but with a slight reduction in performance. See the label on the module to determine the module's

capacity.

The recommended memory configurations are:

lA memory module installed in connector DIMM1

lA pair of matched memory modules installed in connectors DIMM1 and DIMM2

lA pair of matched memory modules installed in connectors DIMM1 and DIMM2 and another matched pair installed in connectors DIMM3 and DIMM4

lIf you install mixed pairs of DDR2 533-MHz (PC2-4300) and DDR2 667-MHz (PC2-5400) memory, the modules function at the slower installed speed.

Be sure to populate the memory modules in order starting with DIMM1, the connector closest to the edge of the system board, before you install modules in

the other connectors.

Memory

Cards

Drives

CD/DVD Drive

Floppy Drive



Media Card Reader

Hard Drive

Battery

Processor

Power Supply



Front I/O Panel

Fan Assembly

System Board

NOTE: Always install DDR2 memory modules in the order indicated on the system board.

NOTICE: Do not install ECC or buffered memory modules. Only unbuffered, non-ECC memory is supported.

Channel A: matched pair of memory

modules in connectors DIMM_1 and

DIMM_2 (white securing clips)

Channel B: matched pair of memory

modules in connectors DIMM_3 and

DIMM_4 (black securing clips)

NOTE: Memory purchased from Dell is covered under your computer warranty.



Installing Memory



1. Follow the procedures in Before You Begin.



2. Press out the securing clip at each end of the memory module connector.



3. Align the notch on the bottom of the module with the crossbar in the connector.



4. Insert the module into the connector until the module snaps into position.

If you insert the module correctly, the securing clips snap into the cutouts at each end of the module.



5. Replace the computer cover. See Replacing the Computer Cover.



6. Connect your computer and devices to electrical outlets, and then turn them on.



NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that

you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module.

Otherwise, your computer may not start properly.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your

computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.

memory connector closer to edge of board

securing clips (2)

connector

cutouts (2)

memory module

notch

crossbar



NOTICE: To avoid damage to the memory module, press the module straight down into the connector while you apply equal force to each end of the

module.

NOTICE: To connect a network cable, first plug the cable into the network port or device, and then plug it into the computer.

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