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Dell™ Dimension™ C521 Service Manual
Before You Begin
About Your Computer
Removing the Computer Cover
Removing and Installing Parts
Replacing the Computer Cover
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.
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 1 cover release Use this latch to remove the cover. See Removing the Computer Cover. latch 2 Service Tag Use to identify your computer when you access the Dell Support website or call support. 3 FlexBay drive Can contain an optional floppy drive or optional Media Card Reader. 4 CD or DVD The drive light is on when
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. Back View of the Computer 1 voltage selection See the safety instructions in the Product Information Guide for more switch information. 2 power connector Insert the power cable. 3 back panel I/O
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. 3 network activity Flashes a yellow light when the computer is transmitting or light receiving network data. A high volume of network traffic may make this light appear to be in a steady "on" state. 4 surround sound Use the (black) surround sound connector to attach multichannel- connector capable speaker
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
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network port or device. 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. CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover. 4. Follow
Back to Contents Page Replacing the Computer Cover Dell™ Dimension™ C521 Service Manual CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. 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. T
Back to Contents Page Removing the Computer Cover Dell™ Dimension™ C521 Service Manual 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
Back to Contents Page Removing and Installing Parts Dell™ Dimension™ C521 Service Manual Memory Battery Cards Processor Drives Power Supply CD/DVD Drive Front I/O Panel Floppy Drive Fan Assembly Media Card Reader System Board Hard Drive 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 ad
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. Installing Memory CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTI
7. When a message appears stating that memory size has changed, press
Installing an Expansion Card 1. Follow the procedures in Before You Begin. 2. Gently push the release tab on the inside of the card retention door to pivot the door open. Because the door is captive, it will remain in the open position. 3. If you are installing a new card, remove the filler bracket to create a card-slot opening, then continue with step 5. 1 release tab 2 card retention door 4. If you are replacing a card that is already installed in the computer,
1 release tab 2 card retention door 3 filler bracket 4 alignment guide 5 alignment bar 8. Close the card retention door by snapping it into place. NOTICE: Do not route card cables over the cards. Cables routed over the cards can prevent the computer cover from closing properly or cause damage to the equipment. 9. Connect any cables that should be attached to the card. See the documentation for the card for information about the card's cable connections. NOTICE: To conn
1 PCI Express x16 card 2 lever 3 securing slot 4 securing tab 5 PCI Express x16 card connector 6. If you are removing the card permanently, install a filler bracket in the empty card-slot opening. NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the computer. The brackets also keep dust and dirt out of your computer. 7. Before you close the card retention door, ensure that: l The tops of all cards and filler br
1 DVD drive 2 optional floppy drive or media card reader 3 hard drive General Installation Guidelines Connect the SATA hard drive to the connector labeled "SATA0." Connect the SATA CD or DVD drives to the connector labeled "SATA1" on the system board. Connecting Drive Cables When you install a drive, you connect two cables—a DC power cable and a data cable—to the back of the drive and to the system board. Drive Interface Connectors 1 interface cable 2 interface connector
CD/DVD Drive 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 cover. Removing a CD/DVD Drive 1. Follow the procedures in Before You Begin. NOTICE: Do not pull the drive out of the computer by the drive cables. Doing so may cause damage to the cables and the cable c
b. Remove the three shoulder screws from the drive-panel insert. 4. If you are replacing an existing drive: a. Remove the existing drive. b. Remove the three shoulder screws from the existing drive. 5. Insert the three shoulder screws into the sides of the new drive and tighten them. 6. Connect the power and data cables to the drive. 7. Align the shoulder screws with the screw guides, and slide the drive into the bay until it clicks into place.
1 drive release latch 2 floppy drive 4. Disconnect the power and data cables from the back of the floppy drive. 5. Replace the computer cover. See Replacing the Computer Cover. NOTICE: To connect a network cable, first plug the cable into the network port or device, and then plug it into the computer. 6. Connect your computer and devices to electrical outlets, and turn them on. Installing a Floppy Drive CAUTION: Before you begin any of the procedures in this se
1 floppy drive 2 slot verification number 8. Slide the drive into the bay until it clicks into place. 9. Connect the data cable to the connector labeled "FLOPPY" on the system board. 10. Replace the CD/DVD drive. 11. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. 12. Replace the computer cover. See Replacing the Computer Cover. NOTICE: To connect a network cable, first plug the cable into t
1 Media Card Reader 2 drive release latch 5. Replace the computer cover. See Replacing the Computer Cover. NOTICE: To connect a network cable, first plug the cable into the network port or device, and then plug it into the computer. 6. Connect your computer and devices to electrical outlets, and then turn them on. Installing a Media Card Reader CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Inf