HP ProDesk 400 G4 Small Form Factor (SFF) - Maintenance and Service Guide

Fan-sink
NOTE: The fan-sink spare park kit includes replacement thermal material.
Follow these steps to remove the fan-sink:
1. Prepare the computer for disassembly (see Preparation for disassembly on page 23).
2. Remove the access panel (see Access panel on page 24).
3. Remove the drive cage (see Drive cage on page 28).
4. Disconnect the fan-sink cable (1) from the system board.
5. Loosen the four slotted Torx-15 captive screws (2) that secure the fan-sink to the computer chassis.
NOTE: Due to the adhesive nature of the thermal material located between the fan-sink and
the processor, it may be necessary to move the fan-sink from side to side when removing the it.
6. Remove the fan-sink (3).
NOTE: The thermal material must be thoroughly cleaned from the surfaces of the fan-sink and
the processor each time the fan-sink is removed. Thermal paste is used on the processor (1) and the fan-sink
section (2) that services it.
Fan-sink 39