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Manuals
Technical Overview: Dell Dimension E521 Service Manual

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Technical Overview

Dell™ Dimension™ E521 Service Manual

  Inside View of Your Computer

  System Board Components

  Power Supply DC Connector Pin Assignments



Inside View of Your Computer

1

floppy drive or Media Card Reader

2

CD or DVD drive

3

power supply

4

system board

5

hard drive

 

 


System Board Components

1

fan connector (FAN_CPU1)

2

processor socket (CPU)

3

memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4)

4

power connector (PW_12V_A1)

5

serial ATA drive connectors (SATA2, SATA3)

6

serial ATA drive connectors (SATA0, SATA1)

7

front-panel connector (FRONTPANEL)

8

power connector (POWER1)

9

line-in, line-out, microphone, side surround, center, and LFE connectors (AUDIO_6_STACK)

10

USB connectors (2) (USB2_BACK1)

11

network connector and USB connectors (2) (NIC_USB1)

12

real-time clock reset jumper (RTCRST)

13

video connector (VIDEO1)

14

battery socket (BT1)

15

Internal USB connector (USB1)

16

PCI Express x16 connector (SLOT1)

17

standby power indicator (AUX_PWR_LED)

18

PCI Express x1 connector (SLOT2)

19

PCI connector (SLOT3)

20

PCI connector (SLOT4)

21

password jumper (PSWD)

22

floppy drive connector (FLOPPY1)

 

 

 

 


Power Supply DC Connector Pin Assignments

DC Power Connector P1

Pin Number

Signal name

18-AWG Wire

1

+3.3 VDC

Orange

2

+3.3 VDC

Orange

3

GND

Black

4

+5 VDC

Red

5

GND

Black

6

+5 VDC

Red

7

GND

Black

8

PS_PWRGOOD

Gray

9

P5AUX

Purple

10

V_12P0_DIG

White

11

V_12P0_DIG

White

12

+3.3 VDC

Orange

13

+3.3VDC/SE*

Orange

14

-12 VDC

Blue

15

GND

Black

16

PWR_PS_ON

Green

17

GND

Black

18

GND

Black

19

GND

Black

20

NC

NC

21

+5 VDC

Red

22

+5 VDC

Red

23

+5 VDC

Red

24

GND

Black

 

DC Power Connector P2

Pin Number

Signal Name

18-AWG Wire

1

GND

Black

2

GND

Black

3

+12 VADC

Yellow

4

+12 VADC

Yellow

DC Power Connectors P3, P5, P8, and P9

Pin Number

Signal name

18-AWG Wire

1

+3.3 VDC

Orange

2

GND

Black

3

+5 VDC

Red

4

GND

Black

5

+12 VBDC

White

DC Power Connector P7

Pin Number

Signal Name

22-AWG Wire

1

+5 VDC

Red

2

GND

Black

3

GND

Black

4

+12 VADC

Yellow

DC Power Connector P10

Pin Number

Signal name

18-AWG Wire

1

+12 VBDC

White

2

GND

Black

3

GND

Black

4

+5 VDC

Red


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