HP dx7300 Technical Reference Manual page 134

Power and Signal Distribution
Power Button/LED, HD LED
Header P5 (USDT, SFF, ST)
Chassis ID0 9
Therm Diode A 13
UART1 DCD- 1
UART1 RX DATA 3
UART1 TX DATA 5
UART1 DTR 7
Hood Lock 1
NOTE:
No polarity consideration required for connection to speaker header P6.
NC = Not connected
Figure 7-8. System Board Header Pinouts
7-14
HD LED + 1
2 PS LED +
HD LED - 3 4 PS LED -
GND5
Pwr Btn 7 8 GND
10 Chassis ID1
GND 11 12 NC
14 Therm Diode C
Mic In Left (Tip) 1
Mic In Right (Sleeve) 3
HP Out Right 5
Sense Send 7
HP Out Left 9
Serial Port A
Header P54
2 UART1 DSR-
4 UART1 RTS-
6 UART1 CTS-
8 UART1 RI-
GND 9 10 Comm A Detect-
Hood Lock
Header P124
2 Coil Conn
4 +12V
GND 5 6 Hood Unlock
Power Button/LED, HD LED
Header P5 (MT, CMT)
HD LED Cathode 1
HD LED Anode 3
GND5
M Reset 7
+5 VDC 9
NC 11
GND 13
Chassis ID2 15
Chassis ID0 17
Front Panel Audio
Header P23
2 Analog GND
4 Front Audio Detect#
6 Sense_1 Return
10 Sense_2 Return
UART2 DTR- 1
UART2 CTS- 3
UART2 TX DATA 5
GND 7
+5.0V 9
UART2 RTS- 11
UART2 DCD- 13
+12V 15
Hood Sense
Header P125
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2 PS LED Cathode
4 PS LED Anode
6 Pwr Btn
8 GND
10 NC
12 GND
16 +5 VDC
18 Chassis ID1
Serial Port B
Header P52
2 UART2 RX DATA
4 UART2 DSR-
6 UART2 RI-
8 GND
10 +3.3V aux
12 Comm B Detect
14 -12V
1 Hood SW Detect
2 GND
3 Hood Sensor
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