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Technical Overview: Dell Dimension 3000 Systems Service Manual

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Technical Overview

Dell™ Dimension™ 3000 Systems Service Manual

Inside View of Your Computer

System Board Components

Power Supply DC Connector Pin Assignments

Inside View of Your Computer

CAUTION: Before you begin any of the procedures in this section, see the safety instructions located in the Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the computer cover.

System Board Components

Power Supply DC Connector Pin Assignments

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


Output Voltage¹	Minimum Current (A)	Maximum Current (A)²
+12 VDC	0.0	16.0³
+5 VDC	1.0/0.2⁴	22.0
+3.3 VDC	0.1/0.0⁵	18.0
-	-	-
–12 VDC	0.0	1.0
+5 VFP	0.0	2.0
¹Outputs will meet and not exceed SELV requirements per electrical standards, for example UL 60950, IEC 60950, EN60950 PAR.2.3. ²Maximum continuous combined load on +5 VDC and +3.3 VDC outputs will not exceed 150 watts. ³Peak +12 VDC output power (up to 17.0 amps) will not exceed 15 seconds in duration. Under this condition, tolerance on the +12v output, is allowed to be +/- 10%. ⁴+5 VDC minimum load will be 0.2A when there is a minimum load of 0.3A on the +12 VDC and 0.42A on the +3.3 VDC outputs simultaneously. +5V min load is 1A for load transient tests. ⁵In system applications where +3.3VDC is not used, all other outputs will stay within regulation while the +3.3 VDC output is in a zero load condition.

DC Power Connector P1

NOTE: The +3.3 VDC output wires (orange) must be 16 AWG. All other output wires must be 18 AWG.


Pin Number	Signal name	Wire Color
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

DC Power Connector P2


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

DC Power Connectors P8 and P9


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

DC Power Connector P4


Pin Number	Signal Name	18-AWG Wire Color
1	-	No connect
2	COM	Black
3	COM	Black
4	+3.3 VDC	Orange
5	+5 VDC	Red
6	+12 VDC	Yellow

DC Power Connector P6


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

DC Power Connector P7


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

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