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Chapter 9 I/O Ports and Connectors
Fan Connectors
These connectors are identical.
Pin Signal
1 GND (ground)
2 Fan sense
3 +12 V
Blower Connectors
These connectors are identical.
Pin Signal
1 Boost
2 GND (ground)
3 Tachometer
4 +12 V
SCSI Controller Activity LED Connector
Pin Signal
1 Return
2 Hard disk active
3 Hard disk active
4 Return