HP 8100 Technical Reference Guide: HP Compaq 8100 Elite Series Business Deskto - Page 75
Power and Signal Distribution, Introduction, Power Distribution
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7 Power and Signal Distribution 7.1 Introduction 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) 7.2 Power 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 Power Button Power On System Board Power Control Logic, DC/DC Converter & Voltage Regulators P1 +12 Vmain +12 Vsb -12 V P2 PS Fan Fan On Cmd Spd P3 Pwr Good +12 Vcpu P3 34 12 P2 6 54 3 21 90 - 264 VAC Power Supply Unit NOTE: Return (RTN or ground) not shown. P1 4 6 1 3 Conn P1 P2 P3 Pin 1 RTN FANcmd RTN Pin 2 RTN Fan Speed RTN Pin 3 -12 V PS On +12 Vcpu Pin 4 +12 Vmain Pwr Good +12 Vcpu Pin 5 +12 Vmain RTN Pin 6 +12 Vsb RTN 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
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