Dell Precision 330 - Manual (Page 68)

Replacing the Hard-Drive Thermal Sensor (Desktop Chassis)
To replace the hard-drive thermal sensor, perform the removal procedure in reverse.
Mini Tower Chassis
l Removing the hard-drive thermal sensor
l Replacing the hard-drive thermal sensor
Removing the Hard-Drive Thermal Sensor (Mini Tower Chassis)
1. Turn off the computer and peripherals, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover .
2. Remove the front panel .
3. Remove the AGP card brace .
4. Remove all expansion cards .
5. Remove the expansion-card guide .
6. Remove the hard-drive bracket .
7. Disconnect the hard-drive thermal sensor cable from the control panel connector (THERMAL). To locate this connector, see " Control Panel Components ."
8. Feed the thermal sensor cable through the routing holes in the drive door and the front wall of the chassis (see the following figure).
NOTE: When mounting the hard-drive thermal sensor in the clip in the front wall of the chassis, ensure that the sensor cable is oriented toward the top of the
chassis.
CAUTION: Before you perform this procedure, see " Precautionary Measures ."
NOTICE: Before disconnecting a peripheral from the system or removing a component from the system board, verify that the standby power indicator on the
system board has turned off. To locate this indicator, see " System Board Components " or " Interior Service Label ."
NOTE: You must open the drive door to feed the thermal sensor cable through the cable routing holes. The sensor cable routes through an enlarged hole
in the front chassis wall and through a hole in the drive door.