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74
J18 - Connector Pinout
Pin
Signal
1
+3.3V
2
+3.3V
3
Ground
4
+5.0V
5
Ground
6
+5.0V
7
Ground
J19 - Connector Pinout
Pin
Signal
1
+3.3V
2
+3.3V
3
Ground
4
Ground
5
+5.0V
6
+5.0V
7
Ground
8
+5V.0
Chassis Cooling Fans
The system has two 12 V DC cooling fans. One fan is mounted in the chassis; the other is located
inside the power supply. The fans pressurize the chassis and force warm air out from the vents.
The table below summarizes fan information.
Fan
Chassis fan
Power supply
fan
Pin
Signal
8
Power Good
9
5.0V Stdby
10
+12.0V
11
+3.3V
12
-12.0V
13
Ground
14
Remote On
Pin
Signal
9
Ground
10
Reserved
11
+5.0V
12
+3.3V
13
Ground
14
Ground
15
Ground
Size
Location
92 mm
Behind
peripheral
device bay
92 mm
Power supply
Pin
Signal
15
Ground
16
Ground
17
Ground
18
-5.0V
19
+5.0V
20
+5.0V
Pin
Signal
16
+5.0V
17
Ground
18
+5.0V
19
Ground
20
+5.0V
21
Ground
22
+5.0V
Airflow
Devices Cooled
Back-to-front
Processors, disk
drives
Back-to-bottom
Processors,
Power supply
Connector
P4, Power
supply
None (internal)
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