Back to Contents Page

Technical Overview

Dell™ Dimension™ 4500S

  Internal View

  System Board Connectors and Sockets

  Power Supply

  DC Power Connectors

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

Your computer is equipped with one of the following 180-W power supply units (see "Safety Instructions" for more information):

• A fixed-voltage power supply — Computers with a fixed-voltage power supply do not have a voltage selection switch on the back panel and operate at only one voltage (see the regulatory label on the outside of the computer for its operating voltage).
  
  
• An auto-sensing voltage circuit — Computers with an auto-sensing voltage circuit do not have a voltage selection switch on the back panel and automatically detect the correct operating voltage.
  
  
• A manual voltage selection switch — Computers with a voltage selection switch on the back panel must be manually set to operate at the correct operating voltage.
  
  

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	10.0
+5 VDC	+/–5%	1.0/0.23	12.0
+3.3 VDC	+/–5%	0.1/0.04	10.0
–12 VDC	+/–10%	0.0	0.5
+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 80 W. 3+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. 4In 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	N/C	N/C
19	+5 VDC	Red
20	+5 VDC	Red
* Use 22-AWG wire instead of 18-AWG wire

DC Power Connector P6

Pin Number	Signal Name	18-AWG Wire
1	COM	Black
2	COM	Black
3	+12 VDC	Yellow
4	+12 VDC	Yellow

DC Power Connectors P2, P3, and P4

Pin Number	Signal Name	18-AWG Wire
1	+12 VDC	Yellow
2	COM	Black
3	COM	Black
4	+5 VDC	Red

DC Power Connector P5

Pin Number	Signal Name	22-AWG Wire
1	+5 VDC	Red
2	COM	Black
3	COM	Black
4	+12 VDC	Yellow

Back to Contents Page