Dell Precision R5400 (Mid 2008) - Manual (Page 16)

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Cooling Fans
Dell Precision™ R5400 Service Manual
Removing a Fan Pair
Replacing a Cooling Fan Pair
The computer includes four cooling fans. The fans are paired and must be removed two fans at a time; fans 1 and 2 are paired, and fans 3 and 4 are paired.
Removing a Fan Pair
1. Perform the steps in Before Working on Your Computer .
2. Lift the removable fan bracket out of the chassis and set it aside.
3. Slide one fan horizontally toward the front of the computer, gently rocking it up and down to ease the four corners of the fan off the corner pin supports.
4. Slide the corresponding fan in the pair similarly to remove it from its pin supports.
5. Disconnect the corresponding fan cable connectors from the system board, and lift the fan pair out of the chassis.
Replacing a Cooling Fan Pair
1. Slip each fan in the pair onto the four corner-support pins for each fan.
2. Route the fan cable pair over the appropriate corner slot in the top of the (unremovable) fan bracket at the back of the fans, and reconnect the cable
connectors to the system board.
CAUTION: Only trained service technicians are authorized to remove the computer cover and access any of the components inside the computer.
Before working inside the computer, read the safety information that shipped with the computer. For additional safety best practices information,
see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.
NOTE: The fans must be removed in pairs.
1 fans (4) 2 fan bracket (removable)
3 cable clip 4 fan bracket (unremovable)
5 corner support pins (4 per fan) 6 fan cables connecting to system board
NOTE: Ensure that the fan-number labels are facing upward.