Chapter 6 Power and Signal Distribution

6.3POWER DISTRIBUTION

6.3.1 3.3/5/12 VDC DISTRIBUTION

The power supply assembly includes a multi-connector cable assembly that routes +3.3 VDC, +5 VDC, -5 VDC, +12 VC, and -12 VDC to the system board as well as to the individual drive assemblies. Figure 6-2 shows the power supply cabling for small form factor series units.

Power Supply

Assembly

(PN 243891)

P4

P3

 

 

 

To

 

P2

Drive

 

Assemblies

 

 

 

P5

 

 

 

To

 

P1

System

 

 

Board

 

 

 

 

P3-P4

 

 

P2

1

2

3

4

 

 

 

 

 

 

 

 

 

 

 

P5

4

3

2

1

 

2

1

 

 

 

 

 

4

3

P1

2 4 6 8 10 12 14

1 3 5 7 9 11 13

Conn.

Pin 1

Pin 2

Pin 3

Pin 4

Pin 5

Pin 6

Pin 7

 

P1

+3.3

+3.3

RTN

+5

RTN

+5

RTN

 

P1 [1]

+3.3

-12

FS

PS On

+5 Aux

FC

+12

 

P2, 4-7

+5

GND

GND

+12

 

 

 

 

P3

GND

GND

+12.8

+12.8

 

 

 

 

NOTES:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connectors not shown to scale.

All + and - values are VDC. RTN = Return (signal ground) GND = Power ground

RS = Remote sense FC = Fan command FO = Fan off FSpd = Fan speed FS = Fan Sink

[1] This row represents pins 8 - 14 of connector P1.

Figure 6–2. Small Form Factor Power Cable Diagram

6-6Compaq Evo and Workstation Personal Computers

Featuring the Intel Pentium 4 Processor

Second Edition- January 2003

Page 131
Image 131
Compaq W4000 manual Power Distribution, 1 3.3/5/12 VDC Distribution, Conn Pin, Rtn