Power Supply - HP Compaq Pro 4300 Maintenance And Service Manual

6. 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.
7. 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:
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.

Power Supply

Description
Power supply, 240W, 85% efficiency
Power supply, 240W, High voltage protection
Power supply, 240W
WARNING!
replacement power supply provided by HP, or a power supply purchased as an accessory from HP
should be used with the computer.
The rotating power supply is located at the rear of the chassis. It is held in place by a bracket – no
screws are used.
WARNING!
active AC outlet. To avoid possible personal injury and damage to the equipment the power cord
should be disconnected from the computer and/or the AC outlet before opening the computer.
1. Prepare the computer for disassembly
2. Remove the access panel
3. Rotate the drive cage up and disconnect the power cables from all of the drives.
4. Disconnect the power cables from the system board connectors labeled PWRCPU, PWR, and
PWRCMD.
5. Rotate the power supply to its full upright position.
6. Release the power supply cables from the cable retaining clip under the drive cage.
78 Chapter 7 Removal and Replacement Procedures Small Form Factor (SFF) Chassis
heat sink retaining screws should be tightened in diagonally opposite pairs (as in
To reduce potential safety issues, only the power supply provided with the computer, a
Voltage is always present on the system board when the computer is plugged into an
(Computer Access Panel on page
(Preparation for Disassembly on page
39).
Spare part number
613663-001
613664-001
613763-001
37).