Heatsink - HP dc5100 - Microtower PC Service & Reference Manual

Removal and Replacement Procedures— Microtower (MT) Chassis

6.14 Heatsink

1. Prepare the computer for disassembly
2. Remove the access panel and rotate the computer so the system board is parallel to the table
to make it easier to work on
3. Disconnect the heatsink fan cable from the system board.
4. Disconnect the four-pin power cable from the system board to make it easier to access the
heatsink.
5. Loosen the four captive screws 1 that secure the heatsink to the system board tray.
6. Lift the heatsink from atop the processor 2 and set is on its side to keep from contaminating
the work area with thermal grease.
When reinstalling an existing heatsink, make sure that its bottom has been cleaned with an
alcohol wipe and fresh thermal grease has been applied to the top of the processor. New heatsinks
come from the factory with fresh thermal grease already applied.
Position the heatsink so that fan wiring is closest to the memory module and the power supply.
Check to ensure that the hetasink mounting lugs do not rest on any electrical components before
tightening the retaining screws.
Ä
CAUTION: Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to
evenly seat the heatsink on the processor. This is especially important as the pins on the socket are very
fragile and any damage to them may require replacing the system board.
6–24
(Section 6.1, "Preparation for
(Section 6.3, "Access Panel").
376220-001
Disassembly").
Service Reference Guide, dc5100