HP Pro Tower 400 G9 PCI Desktop PC Maintenance and Service Guide - Page 46

Option board, Heat sink, If the computer will turn on, before removing the heat sink

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Option board To remove the option board, use these procedures. For a list of available option boards, see Computer major components on page 5. Before removing the option board, follow these steps: 1. Prepare the computer for disassembly (see Preparation for disassembly on page 19). 2. Remove the access panel (see Access panel on page 19). 3. Remove the fan (see Fan on page 37). Remove the option board: 1. Remove the two Phillips screws (1) that secure the board to the system board. 2. Lift to disengage the board from the system board connector, and then remove the option board from the computer (2). To install the option board, reverse the removal procedure. Heat sink To remove the heat sink, use these procedures. IMPORTANT: The bond between the heat sink and the processor can be very tight. If the computer will turn on, before removing the heat sink, turn on the computer until it warms the heat sink. Warming the heat sink loosens the bond between the heat sink and the processor, thereby making it easier to separate them. Do not pull the processor out of the socket when you lift the heat sink, especially if you cannot warm the heat sink before removal. Inadvertently removing the processor can damage the pins. Before removing the heat sink, follow these steps: 1. Prepare the computer for disassembly (see Preparation for disassembly on page 19). Option board 39

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Option board
To remove the option board, use these procedures.
For a list of available option boards, see
Computer major components
on page
5
.
Before removing the option board, follow these steps:
1.
Prepare the computer for disassembly (see
Preparation for disassembly
on page
19
).
2.
Remove the access panel (see
Access panel
on page
19
).
3.
Remove the fan (see
Fan
on page
37
).
Remove the option board:
1.
Remove the two Phillips screws
(1)
that secure the board to the system board.
2.
Lift to disengage the board from the system board connector, and then remove the option board from
the computer
(2)
.
To install the option board, reverse the removal procedure.
Heat sink
To remove the heat sink, use these procedures.
IMPORTANT:
The bond between the heat sink and the processor can be very tight.
If the computer will turn on, before removing the heat sink, turn on the computer until it warms the heat
sink. Warming the heat sink loosens the bond between the heat sink and the processor, thereby making it
easier to separate them.
Do not pull the processor out of the socket when you lift the heat sink, especially if you cannot warm the
heat sink before removal. Inadvertently removing the processor can damage the pins.
Before removing the heat sink, follow these steps:
1.
Prepare the computer for disassembly (see
Preparation for disassembly
on page
19
).
Option board
39