HP 8100 Power and Signal Distribution, 7.1Introduction, 7.2Power Distribution

7

Power and Signal Distribution

7.1Introduction

This chapter describes the power supplies and discusses the methods of general power and signal distribution. Topics covered in this chapter include:

■Power distribution (7.2)

■Power Control (7.3)

■Signal distribution (7.4)

7.2Power Distribution

These systems use a common power source power supply unit contained within the system chassis. Figure 7-1 shows the block diagram for power generation.

Front Bezel

System Board

Power Button

Power Control Logic, DC/DC Converter

Power On

& Voltage Regulators

P1

P2

P3

+12 Vmain

+12 Vsb

-12 V

PS

Fan

Fan

Pwr

+12 Vcpu

On

Cmd

Spd

Good

90 - 264 VAC Power Supply Unit

NOTE: Return (RTN or ground) not shown.

Conn	Pin 1	Pin 2	Pin 3	Pin 4	Pin 5	Pin 6
P1	RTN	RTN	–12 V	+12 Vmain	+12 Vmain	+12 Vsb
P2	FANcmd	Fan Speed	PS On	Pwr Good	RTN	RTN
P3	RTN	RTN	+12 Vcpu	+12 Vcpu

P3

3 4

1 2

P2

6 5 4 3 2 1

P1

46

13

NOTES:

Connectors not shown to scale.

All + and – values are VDC.

RTN = Return (signal ground)

Figure 7-1. Power Distribution and Cabling, Block Diagram

Technical Reference Guide www.hp.com 7-1