HP 8000 tower 7.3 SFF/CMT Power Distribution, 1 lists the specifications of the external supply

Power and Signal Distribution

Table 7-1 lists the specifications of the external supply.

Table 7-1.

USDT 135-Watt Power Supply Unit Specifications

Parameter
Input Line Voltage Range	90–265 VAC
Line Frequency	47–63 Hz
Input Current, Maximum load @ 90 VAC	2.4 A
Output Voltage	19.5 VDC
Output Current, nominal load	3.5 A
Output Current, maximum load	6.9 A
Output Current, peak load (300 ms max) [1]	9.0 A

NOTES:

Total continuous power should not exceed 135 watts. Total surge power (<10 seconds w/duty cycle < 5 %) should not exceed 170 watts.

[1]Using 100 VAC input. The output voltage is allowed to drop to a minimum of 15 VDC during the transient period.

7.3SFF/CMT Power Distribution

The SFF and CMT form factors use a common power source power supply unit contained within the system chassis. Figure 7-2 shows the block diagram for power generation in the SFF and CMT.

Front Bezel

Power Button

System Board

P3

3 4

Power Control Logic, DC/DC Converter
Power On	& Voltage Regulators						1	2
	P1			P2			P3	P2
+12 Vmain	+12 Vsb	-12 V	PS	Fan	Fan	Pwr	+12 Vcpu
			On	Cmd	Spd	Good
							6 5 4 3 2 1
								P1

4 6

90 - 264 VAC Power Supply Unit

1 3

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

NOTES:

Connectors not shown to scale.

All + and – values are VDC.

RTN = Return (signal ground)

Figure 7-2. SFF/CMT Power Distribution and Cabling, Block Diagram

7-2 www.hp.com Technical Reference Guide