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Technical Overview: Dell Dimension C521 Service Manual
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Technical Overview
Dell™ Dimension™ C521 Service Manual
 Inside View of Your Computer
System Board Components
Power Supply DC Connector Pin Assignments
Inside View of Your Computer
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CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. |
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CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover. |
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1
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drives bay (CD/DVD, floppy, media card reader, and hard drive)
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2
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power supply
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3
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system board
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4
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card slots
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5
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heat sink assembly
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6
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front I/O panel
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System Board Components
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1
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fan connector (FAN_CPU1)
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2
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processor socket (CPU)
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3
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memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4)
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4
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power connector (PW_12V_A1)
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5
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power connector (POWER1)
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6
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SATA drive connectors (SATA0, SATA1)
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7
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front-panel connector (FRONTPANEL)
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8
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CMOS reset (RTCRST)
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9
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battery socket (BT1)
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10
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internal USB (USB1)
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11
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PCI Express x16 connector (SLOT1)
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12
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PCI Express x1 connector (SLOT2)
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13
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PCI connector (SLOT3)
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14
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password jumper (PSWD)
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15
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floppy drive connector (FLOPPY1)
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Jumper Settings
The jumper locations are shown below.
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Jumper
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Setting
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Description
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PSWD
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Password features are enabled (default setting).
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Password features are disabled.
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RTCRST
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The real-time clock has not been reset.
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The real-time clock is being reset (jumpered temporarily).
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jumpered 
unjumpered
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Power Supply DC Connector Pin Assignments
DC Power Connector P1
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Pin Number
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Signal name
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18-AWG Wire
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1
| +3.3 VDC
| Orange
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2
| +3.3 VDC
| Orange
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3
| GND
| Black
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4
| VCC (+5 V)
| Red
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5
| GND
| Black
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6
| VCC (+5 V)
| Red
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7
| GND
| Black
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8
| PS_PWRGOOD
| Gray
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9
| P5AUX
| Purple
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10
| V_12P0_DIG
| White
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11
| V_12P0_DIG
| White
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12
| +3.3 V
| Orange
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13
| +3.3 V
| Orange
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14
| -12 V*
| Blue
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15
| GND
| Black
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16
| PWR_PS_ON
| Green
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17
| GND
| Black
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18
| GND
| Black
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19
| GND
| Black
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20
| NC
| N/C
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21
| VCC (+5V)
| Red
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22
| VCC (+5V)
| Red
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23
| VCC (+5V)
| Red
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24
| GND
| Black
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*Use 22-AWG wire instead of 18-AWG wire.
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DC Power Connector P2
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Pin Number
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Signal Name
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18-AWG Wire
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1
| COM
| Black
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2
| COM
| Black
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3
| +12 VDC
| Yellow
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4
| +12 VDC
| Yellow
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DC Power Connector P3
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Pin Number
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Signal name
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18-AWG Wire
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1
| +12VDC
| Yellow
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2
| COM
| Black
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3
| COM
| Black
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4
| +5 VDC
| Red
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DC Power Connector P4
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Pin Number
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Signal Name
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22-AWG Wire
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1
| +5 VCD
| Red
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2
| COM
| Black
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3
| COM
| Black
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4
| +12 VDC
| Yellow
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DC Power Connector P5 and P6
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Pin Number
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Signal name
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18-AWG Wire
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1
| +3.3 VDC
| Orange
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2
| COM
| Black
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3
| +5 VDC
| Red
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4
| COM
| Black
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5
| +12 VDC
| Yellow
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