HP ProBook 4420s HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Mai - Page 83

that secure the heat sink to the processor., Following the sequence stamped into the heat sink

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4. Lift the right edge of the heat shield to disengage the tabs on the left side of the heat shield from the top cover, and then remove the heat shield (3). 5. Disconnect the fan cable from the system board (1). 6. Loosen the 2.0×5.0 captive screw from the system board, and then remove the fan (3). 7. Following the sequence stamped into the heat sink, loosen the four PM2.5×10.0 captive screws (1) that secure the heat sink to the processor. Component replacement procedures 75

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4.
Lift the right edge of the heat shield to disengage the tabs on the left side of the heat shield from
the top cover, and then remove the heat shield
(3)
.
5.
Disconnect the fan cable from the system board
(1)
.
6.
Loosen the 2.0×5.0 captive screw from the system board, and then remove the fan
(3)
.
7.
Following the sequence stamped into the heat sink, loosen the four PM2.5×10.0 captive screws
(1)
that secure the heat sink to the processor.
Component replacement procedures
75