Sony PCV-R553DS - Manual (Page 76)

VAIO Digital Studio™ Reference Manual 62
Fan Connector
The PWR-FAN connector is a 1 x 3-pin straight header connector.
PWR-FAN connects to the power supply and controls the power supply
cooling fan.
PWR-FAN Connector
Pin Signal Name
1 Ground
2 FAN_CTRL (+12V)
3 FAN_SEN
KY0034.VSD
PWR-FAN
3
1