HP dx2420 Service Reference Guide: HP Compaq dx2420 Business PC - Page 78
-Pin Power, 4-Pin Power (for CPU), SATA Data and Power
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24-Pin Power Connector 24 12 Pin Signal 1 +3.3V 2 +3.3V 3 GND 4 +5V 5 GND 6 +5V 13 1 Pin Signal 7 GND 8 POK 9 +5 Vaux 10 +12V 11 +12V 12 +3.3V Front Pin Signal 13 +3.3V 14 -12V 15 GND 16 PSON 17 GND 18 GND Pin Signal 19 GND 20 open 21 +5V 22 +5V 23 +5V 24 GND 4-Pin Power (for CPU) Connector and Icon Pin Signal 1 GND 2 GND 3 +12V CPU 4 -12V CPU SATA Data and Power Drive Connector Pin Signal S1 Ground S5 B- Pin Signal S2 A+ S6 B+ Pin Signal S3 AS7 Ground Pin Signal S4 Ground 72 Appendix A Connector Pin Assignments
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24-Pin Power
Connector
24
12
13
1
Front
Pin
Signal
Pin
Signal
Pin
Signal
Pin
Signal
1
2
3
4
5
6
+3.3V
+3.3V
GND
+5V
GND
+5V
7
8
9
10
11
12
GND
POK
+5 Vaux
+12V
+12V
+3.3V
13
14
15
16
17
18
+3.3V
–12V
GND
PSON
GND
GND
19
20
21
22
23
24
GND
open
+5V
+5V
+5V
GND
4-Pin Power (for CPU)
Connector and Icon
Pin
Signal
1
2
3
4
GND
GND
+12V CPU
-12V CPU
SATA Data and Power
Drive Connector
Pin
Signal
Pin
Signal
Pin
Signal
Pin
Signal
S1
S5
Ground
B-
S2
S6
A+
B+
S3
S7
A-
Ground
S4
Ground
72
Appendix A
Connector Pin Assignments