Dell C521 User Manual

Dell™Dimension™C521ServiceManual Before You Begin About Your Computer Technical Overview Removing the Computer Cover Specifications Troublesh

 Installing Memory   1. Follow the procedures in Before You Begin.  2. Press out the securing clip at each end of the memory module connector.

 7. When a message appears stating that memory size has changed, press <F1> to continue.  8. Log on to your computer.  9. Right-click

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 d

 8. Close the card retention door by snapping it into place.  9. Connect any cables that should be attached to the card. See the documentation

 6. If you are removing the card permanently, install a filler bracket in the empty card-slot opening.  7. Before you close the card retention d

 General Installation Guidelines Connect the SATA hard drive to the connector labeled "SATA0." Connect the SATA CD or DVD drives to the c

CD/DVD Drive    Removing a CD/DVD Drive  1. Follow the procedures in Before You Begin.  2. Pull up on the drive release latch and slide the

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

 4. Disconnect the power and data cables from the back of the floppy drive.  5. Replace the computer cover. See Replacing the Computer Cover.

 8. Slide the drive into the bay until it clicks into place.  9. Connect the data cable to the connector labeled "FLOPPY" on the syst

Back to Contents Page  About Your Computer Dell™Dimension™C521ServiceManual Front View Back View of the Computer Back Panel I/O Connect

 5. Replace the computer cover. See Replacing the Computer Cover.  6. Connect your computer and devices to electrical outlets, and then turn the

 7. Slide the Media Card Reader into the bay until it clicks into place.  8. Connect the power and data cables to the back of the Media Card Re

 Installing a Hard Drive  1. Check the documentation for the drive to verify that it is configured for your computer.  2. Unpack the replacemen

 7. Gently slide the drive into the bay until it clicks into place.  8. Replace any drives or readers that you removed.  9. Check all conn

To replace the battery:  1. Record all of the settings in system setup (see System Setup Options) so that you can restore the correct settings in ste

 4. Pull the release lever straight up until the processor is released.  5. Remove the processor from the socket. Leave the release lever ex

 2. Unpack the new processor, being careful not to bend any of the processor pins.  3. If the release lever on the socket is not fully extended, m

 10. Replace the computer cover. See Replacing the Computer Cover.  11. Connect your computer and devices to electrical outlets, and turn them o

 5. Slide the power supply toward the front of the computer and lift the power supply up and out of the computer.  6. Lower the replacement pow

 6. Disconnect the cable attached to the front I/O panel.  7. Remove the screw that secures the front I/O panel to the chassis.  8. Rotate t

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 obj

 4. Disconnect the fan power cable from the FAN_CPU1 connector on the system board. See System Board Components.  5. While pressing the fan rele

 5. Remove the memory. See Removing Memory. Make a note of where each memory module(s) is installed so that you can reinstall the memory module(s

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Back to Contents Page  Specifications Dell™Dimension™C521ServiceManual  Microprocessor Microprocessor type AMD™Athlon™64X2Dual-Core proce

card size low profile connector size 124 pins connector data width (maximum) 32 bits PCI Express:  connectors one x1 and one x16 power 10 W (x1) and

Back to Contents Page  Power DC power supply: Wattage 280 W Heat dissipation 955.39 BTU/hr maximum  NOTE: Heat dissipation is calculated based upon

Back to Contents Page  System Setup Dell™Dimension™C521ServiceManual Overview Clearing Forgotten Passwords and CMOS Settings Flashing t

 System Setup Options and lists keys and their functions within the active system setup field. NOTE: Depending on your computer and installed device

(Auto default)  NOTE: A PCI Express graphics card will override the integrated video controller. Video Memory Size (64MB default) This setting config

 Boot Menu This feature allows you to change the boot sequence for devices.  Option Settings l Bootable Hard Drive — The computer attempts to boot

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, for

 1. Enter system setup, select Boot Sequence from the System group. See System Setup Options.  2. Press <Enter> to access the menu.  3.

 Clearing CMOS Settings   1. Follow the procedures in Before You Begin.  2. Reset the current CMOS settings: a. Locate the 2-pin CMOS jumpe

Back to Contents Page  Technical Overview Dell™Dimension™C521ServiceManual Inside View of Your Computer System Board Components Power S

 Jumper Settings The jumper locations are shown below. 1 fan connector (FAN_CPU1) 2 processor socket (CPU) 3 memory module connectors (DIMM_1, DI

- Power Supply DC Connector Pin Assignments  DC Power Connector P1  The real-time clock is being reset (jumpered temporarily). jumpered 

 DC Power Connector P2  DC Power Connector P3  DC Power Connector P4  DC Power Connector P5 and P6 23 VCC (+5V) Red 24 GND Black *Use 22-A

Back to Contents Page  3 +5 VDC Red 4 COM Black 5 +12 VDC Yellow

Back to Contents Page Dell™Dimension™C521ServiceManual Notes, Notices, and Cautions Information in this document is subject to change without n

Back to Contents Page  Troubleshooting Dell™Dimension™C521ServiceManual Dell Diagnostics System Lights Diagnostic Lights Beep Codes

Close the test screen to return to the Main Menu screen. To exit the Dell Diagnostics and restart the computer, close the Main Menu screen. System Li

Back to Contents Page  Before You Begin Dell™Dimension™C521ServiceManual Getting Started Recommended Tools Turning Off Your Computer 

Beep Codes Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of beeps, called

 2. Disconnect any telephone or network cables from the computer.  3. Disconnect your computer and all attached devices from their electrical out

Back to Contents Page  Replacing the Computer Cover Dell™Dimension™C521ServiceManual   1. Ensure that all cables are connected, and fold cab

Back to Contents Page  Removing the Computer Cover Dell™Dimension™C521ServiceManual    1. Follow the procedures in Before You Begin.  2.

Back to Contents Page  Removing and Installing Parts Dell™Dimension™C521ServiceManual Memory If your computer only has one memory module ins