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Technical Overview

Dell Dimension 4700 Series 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 305-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 Voltage	Minimum Current (A)	Maximum Current (A)1
+5 VDC	0.3	22.0
+3.3 VDC	0.32	17.0
+12A VDC	0.0	18.03,4
+12B VDC	0.0	18.03,4
-12 VDC	0.0	1.0
+5 VFP	0.0	2.0
1Maximum continuous total DC output cannot exceed 305 W. Maximum continuous combined load on +5-VDC and +3.3-VDC outputs cannot exceed 150 W. 2In system applications where +3.3 VDC is not used, these values may be 0 A without affecting the regulation of the other outputs. 3Maximum +12A and +12B VDC output (up to 19.0 A) will not exceed 15 seconds in duration. Under this condition, tolerance on the +12A and +12B VDC output, may be +/- 10%. 4+12A VDC and +12B VDC maximum combined power may not exceed 264W.

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	+12B VDC	White
11	+12B VDC	White
12	+3.3 VDC	Orange
13	+3.3 VDC	Orange
14	-12 VDC	Blue
15	COM	Black
16	PS_ON	Green
17	COM	Black
18	COM	Black
19	COM	Black
20	N/C	N/C
21	+5 VDC	Red
22	+5 VDC	Red
23	+5 VDC	Red
24	COM	Black

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	+12B VDC	White
2	COM	Black
3	COM	Black
4	+5 VDC	Red

DC Power Connectors P3 and P5 (for SATA drives)

Signal Name	18-AWG Wire Color
+3.3 VDC	Orange
COM	Black
+5 VDC	Red
COM	Black
+12B VDC	White

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	+5VDC	Red
6	+12B VDC	White

DC Power Connector P6

Pin Number	Signal Name	18-AWG Wire Color
1	+12A 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	+12A VDC	Yellow

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