5. Disconnect the fan cable from the system board connector labeled CPUFAN (1), and then lift the
heat sink from atop the processor (2).
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 fan sink on the processor to avoid damage that could require replacing the system
board.
Make sure to replace the fan duct. Failure to install the fan duct may cause the computer to overheat.
Processor
Description Spare part number
Intel Core i7 processor
4770, 3.4 GHz, 8-MB L3 cache, 86W 727373-001
Intel Core i5 processors
4670, 3.4 GHz, 6-MB L3 cache, 86W 727381-001
4570, 3.2 GHz, 6-MB L3 cache, 86W 727380-001
1. Prepare the computer for disassembly (Preparation for disassembly on page 84).
2. Remove the access panel (
Access panel on page 85).
3. Remove the fan duct (
Fan duct on page 114).
4. Remove the fan sink (
Fan sink on page 125).
126 Chapter 6 Removal and replacement procedures: Small Form Factor (SFF)
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