HP Small Form Factor PC dc5850 manual 83

Power and Signal Distribution

Figure 7-4 shows pinouts of headers used on the sytem boards.

Power Button/LED, HD LED		Front I/O USB
Header P5		Header P5
HD LED + 1	2 PS LED +	+5 V fused 1	2 +5 V fused
HD LED - 3	4 PS LED -	USB port 8- 3	4 USB port 9-
GND5		USB port 8+ 5	6 USB port 9+
Pwr Btn 7	8 GND	GND 7	8 GND
Chassis ID0 9	10 Chassis ID1		10 Front USB detect#

			Serial Port B
			Header P52
	Media Card Reader USB I/F		UART2 DTR- 1			2 UART2 RX DATA
	Header P150
			UART2 CTS- 3			4 UART2 DSR-
	+5 V fused 1	2 +5 V fused
			UART2 TX DATA 5			6 UART2 RI-
	USB port 7- 3	4 USB port 6-
			GND 7			8 GND
	USB port 7+ 5	6 USB port 6+
			+5.0V 9			10 +3.3V aux
	GND 7	8 GND
			UART2 RTS- 11			12 Comm B Detect
		10 not connected
			UART2 DCD- 13			14 -12V
			+12V 15
	Front Panel Audio
				Fan Header
	Header P23
	Mic In Left (Tip) 1	2 Analog GND	Header P8, P16
					1 GND
Mic In Right (Sleeve) 3		4 Front Audio Detect#
					2 +12 VDC
	HP Out Right 5	6 Sense_1 Return
					3 Fan tach
	Sense Send 7
					4 Fan PWM input
	HP Out Left 9	10 Sense_2 Return

NOTE:

No polarity consideration required for connection to speaker header P6.

NC = Not connected

Figure 7-4. System Board Header Pinouts

Technical Reference Guide www.hp.com 7-9