Intel MB820 - Manual (Page 24)

INSTALLATIONS
20 MB820 User’s Manual
Hard Disk Drive LED Connector: Pins 10 and 20
This connector connects to the hard drive activity LED on
control panel. This LED will flash when the HDD is being
accessed.
Pin # Signal Name
10 HDD Active
20 5V
FAN1: CPU Fan Power Connector
Pin # Signal Name
1 Ground
2 +12V
3 Rotation detection
FAN2: VGA Fan Power Connector
Pin # Signal Name
1 Ground
2 +12V
3 Rotation detection
FAN3: Chassis Fan Power Connector
Pin # Signal Name
1 Ground
2 +12V
3 Rotation detection