4. Disconnect the cable from the USB board ZIF connector (5).
5. Remove the USB board (6) from the computer.
To install the USB board, reverse this procedure.
Heat sink
To remove the heat sink, use these procedures and illustrations.
Table 6-9
Heat sink descriptions and part numbers
Description Spare part number
15 W models N07344-001
28 W models N07345-001
Before removing the heat sink, follow these steps:
1. Prepare the computer for disassembly (see Preparation for disassembly on page 37).
2. Remove the bottom cover (see Bottom cover on page 37).
3. Disconnect the battery cable from the system board (see Battery on page 48).
(UMA models) Remove the heat sink:
1. Peel the tape (1) off the heat sink.
2. In the order indicated on the heat sink, loosen the four captive Phillips screws (2) that secure the
heat sink to the computer.
3. Remove the heat sink (3) from the computer.
56
Chapter 6 Removal and replacement procedures for authorized service provider parts
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