HP Pro 3500 Micro Maintenance & Service Guide Pro 3400 3405 3410 3500 3505 - Page 127

Fan sink retaining screws should be tightened in diagonally opposite pairs as in an X

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4. Disconnect the cable from the system board (1), lift the fan sink from atop the processor (2) and set it on its side to keep from contaminating the work area with thermal grease. When reinstalling the fan sink, 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: Fan sink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heat sink on the processor to avoid damage that could require replacing the system board. Failure to install the fan duct may cause the computer to overheat. Fan Sink 117

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4.
Disconnect the cable from the system board
(1)
, lift the fan sink from atop the processor
(2)
and
set it on its side to keep from contaminating the work area with thermal grease.
When reinstalling the fan sink, 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:
Fan sink retaining screws should be tightened in diagonally opposite pairs (as in an X)
to evenly seat the heat sink on the processor to avoid damage that could require replacing the system
board.
Failure to install the fan duct may cause the computer to overheat.
Fan Sink
117