HP 5850 - Deskjet Color Inkjet Printer, Reference Manual

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Heatsink
WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system components
to cool before touching.
1. Prepare the computer for disassembly ( Preparation for Disassembly on page 108 ).
2. Remove the access panel ( Computer Access Panel on page 114 ).
3. Disconnect the heatsink fan control cable from the system board (P8, CPUFAN).
4. Loosen the four captive silver T15 screws that secure the heatsink to the system board tray.
CAUTION: Heatsink retaining screws should be removed in diagonally opposite pairs (as in an
X) to even the downward forces 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.
5. Lift the heatsink from atop the processor and set it on its side to keep from contaminating the work
area with thermal grease.
When reinstalling the 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.
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.
Failure to install the fan shroud may cause the computer to overheat.
Heatsink 155