HP dx2290 Service Reference Guide - HP Compaq dx2290 Business PC - Page 67

Power Supply

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Power Supply WARNING! Voltage is always present on the system board when the computer is plugged into an 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 (Preparation for Disassembly on page 26). 2. Remove the access panel (Access Panel on page 28). 3. Lay the computer down on its side for greater stability. 4. Disconnect all power cables from the mass storage devices and from the system board. 5. Remove the four screws that secure the power supply to the chassis. 6. If necessary, press down on the tab in from of the power supply. 7. Slide the power supply toward the front of the computer, and then lift it out of the computer. To install the power supply, reverse the removal procedure. When inserting the main power supply connector into the connector on the system board, four pins are unused. The main power supply connector is a 20-pin connector, the power connector on the system board is 24-pin. The connectors are keyed, so you can only properly insert the connector in the correct orientation. Power Supply 59

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Power Supply
WARNING!
Voltage is always present on the system board when the computer is plugged into an
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 (
Preparation for Disassembly
on page
26
).
2.
Remove the access panel (
Access Panel
on page
28
).
3.
Lay the computer down on its side for greater stability.
4.
Disconnect all power cables from the mass storage devices and from the system board.
5.
Remove the four screws that secure the power supply to the chassis.
6.
If necessary, press down on the tab in from of the power supply.
7.
Slide the power supply toward the front of the computer, and then lift it out of the computer.
To install the power supply, reverse the removal procedure.
When inserting the main power supply connector into the connector on the system board, four pins are
unused. The main power supply connector is a 20-pin connector, the power connector on the system
board is 24-pin. The connectors are keyed, so you can only properly insert the connector in the correct
orientation.
Power Supply
59