Acer Aspire X3990 Service Manual page 91

ATX_ POWER: ATX 24-pin Power Connector
Pin
1
2
3
4
5
6
7
8
9
10
11
12
ATX12V: ATX 12V Power Connector
83
Signal Name
+3.3V
+3.3V
COM
+5V
COM
+5V
COM
PWR OK
+5VSB
+12V
+12V
+3.3V
Pin Signal Name
1 Ground
2 Ground
3 +12V
4 +12V
Pin Signal Name
13 +3.3V
14 -12V
15 COM
16 PS_ON
17 COM
18 COM
19 COM
20 -5V
21 +5V
22 +5V
23 +5V
24 COM
Chapter 5