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Technical Overview

Dell™ Dimension™ 4550 Series

  Internal View

  System Board Connectors and Sockets

  Power Supply

  DC Power Connectors

  IDE Interface Cable Connections for Dell-Installed Drives

  Placement of Dell-Installed Cards


Internal View

CAUTION: Before you begin any of the procedures in this section, read "Safety Instructions."
NOTICE: Be careful when opening the computer cover to ensure that you do not inadvertently disconnect cables from the system board.

System Board Connectors and Sockets

Power Supply

The 250-W power supply can operate from an AC power source of 115 VAC at 60 Hz or 230 VAC at 50 Hz. The power supply provides the DC operating voltages and currents listed in the following table.

Output Voltage1

Regulation

Minimum Current (A)

Maximum Current (A)2

+12 VDC

+/–5%

0.0

14.03

+5 VDC

+/–5%

1.0/0.24

22.0

+3.3 VDC

+/–5%

0.1/0.05

18.0

–12 VDC

+/–10%

0.0

1.0

+5 VFP

+/–5%

0.0

2.0

1Outputs meet and do not exceed SELV requirements per electrical standards (UL 1950, IEC 950, or EN60950 Par. 2.3).

2Maximum continuous combined load on +5 VDC and +3.3 VDC outputs do not exceed 150 W.

3Peak +12 VDC output power (up to 15.0 A) does not exceed 15 seconds in duration. Under this condition, tolerance on the +12 VDC output is allowed to be +–10%.

4+5 VDC minimum load is 0.2 A when there is a minimum load of 0.3 A on the +12 VDC and 0.42 A on the +3.3 VDC outputs simultaneously. +5 V minimum load is 1 A for load transient tests.

5In system configurations where +3.3 VDC is not used, all other outputs stay within regulation while the +3.3 VDC output is in a zero load condition.

DC Power Connectors

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

COM

Black

4

+5 VDC

Red

5

COM

Black

6

+5 VDC

Red

7

COM

Black

8

POK

Gray

9

+5 VFP

Purple

10

+12 VDC

Yellow

11

+3.3 VDC*

Orange

12

–12 VDC

Blue

13

COM

Black

14

PS ON

Green

15

COM

Black

16

COM

Black

17

COM

Black

18

+5 VDC

N/C

19

+5 VCD

Red

20

+5 VCD

Red

*Sense connector

DC Power Connector P2

Pin Number

Signal Name

18-AWG Wire

1

COM

Black

2

COM

Black

3

+12 VDC

Yellow

4

+12 VDC

Yellow

DC Power Connectors P3, P5, P6, P8, and P9

Pin Number

Signal Name

18-AWG Wire

1

+12 VCD

Yellow

2

COM

Black

3

COM

Black

4

+5 VDC

Red

DC Power Connector P7

Pin Number

Signal Name

22-AWG Wire

1

+5 VCD

Red

2

COM

Black

3

COM

Black

4

+12 VDC

Yellow

IDE Interface Cable Connections for Dell-Installed Drives

IDE Channel IDE

Connector Location

Dell-Installed Drive

Primary IDE master

End connector on PRI IDE connector cable

Hard drive

Primary IDE slave

Middle connector on cable PRI IDE connector

Zip drive

Secondary IDE master

End connector on cable SEC IDE connector

CD or DVD drive

Secondary IDE slave

Middle connector on SEC IDE connector cable

CD-RW drive

Placement of Dell-Installed Cards

Card Connector

Card Description

AGP connector

Video

PCI1 connector

Sound

PCI2 connector

Modem

PCI3 connector

Network adapter, wireless network adapter, or swap box

PCI4 connector

1394 IEEE

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