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Technical Reference Guide www.hp.com 7-9

Power and Signal Distribution

Figure 7-3 shows the power supply cabling for the SFF/ST systems.

Connectors not shown to scale.

All + and - values are VDC.

RTN = Return (signal ground)

sns = sense

GND = Power ground

RS = Remote sense

FC = Fan command

FO = Fan off

FSpd = Fan speed

FS = Fan Sink

POK = Power OK (power good)

VccP = +12 for CPU

[1] This row represents pins 13–24 of connector P1

Figure 7-3. SFF/ST Power Cable Diagram

Conn Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9

P1 +5

aux

RTN + 5 +5 PS On RTN Pwr Gd +3.3 +3.3 Tach RTN Fan

P1 [1] +12 +5 sns RTN +5 +5 +3.3 RTN +3.3 sns +3.3 +3.3 RTN -12

P2 +5 RTN RTN +12

P3 RTN RTN RTN VccP VccP +12

P4, 5,

+3.3 RTN +5 RTN +12

Power Supply

403778

P4, P5, P7

HP dx7300 User Manual

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