HP dx2420 Service Reference Guide: HP Compaq dx2420 Business PC - Page 68

Rear Chassis Fan, CAUTION,

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5. If using a new heat sink, remove the protective covering from the bottom of the heat sink and place it in position atop the processor. 6. Secure the heat sink to the system board and system board tray with the four captive screws and attach the heat sink control cable to the system board. CAUTION: Heat sink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heat sink on the processor. This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board. NOTE: After installing a new processor onto the system board, always update the system ROM to ensure that the latest version of the BIOS is being used on the computer. The latest system BIOS can be found on the Web at: http://h18000.www1.hp.com/support/files. Rear Chassis Fan 1. Prepare the computer for disassembly (Preparation for Disassembly on page 28). 2. Remove the computer access panel (Computer Access Panel on page 32). 3. Disconnect the fan control cable from the dark red system board connector labeled SYS_FAN1. 4. From the outside, remove the four silver Phillips screws that secure the fan to the chassis. Figure 6-40 Removing the rear chassis fan 5. Lift the fan out of the chassis. To install the fan assembly, reverse the removal procedure. CAUTION: Be sure to orient the air flow out of the unit. 62 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis

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5.
If using a new heat sink, remove the protective covering from the bottom of the heat sink and place
it in position atop the processor.
6.
Secure the heat sink to the system board and system board tray with the four captive screws and
attach the heat sink control cable to the system board.
CAUTION:
Heat sink retaining screws should be tightened in diagonally opposite pairs (as in an
X) to evenly seat the heat sink on the processor. This is especially important as the pins on the
socket are very fragile and any damage to them may require replacing the system board.
NOTE:
After installing a new processor onto the system board, always update the system ROM to
ensure that the latest version of the BIOS is being used on the computer. The latest system BIOS can
be found on the Web at:
support/files
.
Rear Chassis Fan
1.
Prepare the computer for disassembly (
Preparation for Disassembly
on page
28
).
2.
Remove the computer access panel (
Computer Access Panel
on page
32
).
3.
Disconnect the fan control cable from the dark red system board connector labeled SYS_FAN1.
4.
From the outside, remove the four silver Phillips screws that secure the fan to the chassis.
Figure 6-40
Removing the rear chassis fan
5.
Lift the fan out of the chassis.
To install the fan assembly, reverse the removal procedure.
CAUTION:
Be sure to orient the air flow out of the unit.
62
Chapter 6
Removal and Replacement Procedures Microtower (MT) Chassis