HP ProBook 4420s HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Mai - Page 84

system board

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NOTE: Loosen the two additional screws that secure the heat sink to the graphics devices on models with discrete graphics subsystem memory. 8. Lift the heat sink off the processor (2), and then lift the heat sink up and to the right to remove the heat sink from the base enclosure (3). NOTE: The thermal material must be thoroughly cleaned from the surfaces heat sink for the discrete system board (1), (2), and (3), and the system board (4), (5), and (6) each time the heat sink is removed. Replacement thermal material is included with all heat sink, system board, and processor spare part kits. NOTE: The thermal material must be thoroughly cleaned from the surfaces of heat sink for the UMA system board (1), (2), and (3) and the system board components (3), (4) and (5) each time the heat sink is removed. Replacement thermal material is included with all heat sink, system board, and processor spare part kits. 76 Chapter 4 Removal and replacement procedures

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NOTE:
Loosen the two additional screws that secure the heat sink to the graphics devices on
models with discrete graphics subsystem memory.
8.
Lift the heat sink off the processor
(2)
, and then lift the heat sink up and to the right to remove
the heat sink from the base enclosure
(3)
.
NOTE:
The thermal material must be thoroughly cleaned from the surfaces heat sink for the
discrete system board
(1)
,
(2)
, and
(3)
, and the system board
(4)
,
(5)
, and
(6)
each time the heat sink
is removed. Replacement thermal material is included with all heat sink, system board, and processor
spare part kits.
NOTE:
The thermal material must be thoroughly cleaned from the surfaces of heat sink for the UMA
system board
(1)
,
(2)
, and
(3)
and the system board components
(3)
,
(4)
and
(5)
each time the heat
sink is removed. Replacement thermal material is included with all heat sink, system board, and
processor spare part kits.
76
Chapter 4
Removal and replacement procedures