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Replacing the Power Supply

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This document pertains to HP Pavilion 83xx and 84xx desktop PCs.

Introduction

This document provides instructions for replacing an internal power supply using an authorized HP Pavilion Customer Replaceable Part kit (CRP). CRP kits are available for in warranty HP Pavilion PCs or may be obtained by calling HP Pavilion Technical Support.
This procedure takes approximately one hour to complete, use the caution and warning notes to ensure successful installation.

Before you begin

CAUTION:This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.
WARNING:The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
WARNING: Do not operate the PC with the cover removed. Always replace the cover before turning on the PC.
Read the items below before replacing the hard drive:
  • These procedures assume familiarity with the general terminology associated with personal computers and with the safety practices and regulatory compliance required for using and modifying electronic equipment.
  • Set up an equipment log to record the PC model and serial numbers, all installed options, and other information about the PC. If you need this information, it will be easier to consult the log than to open up and examine the PC.
  • These procedures require a #2 Phillips screwdriver and a medium flat-blade screwdriver. It is recommended to use an anti-static wrist strap and a conductive foam pad when working on the PC.
  • Disconnect the PC from any telecommunications links, networks, or modems, and disconnect the power source before performing any of the procedures described in this document. Failure to do so can cause personal injury or damage to equipment.

Removing the right side panel

Remove the right side panel to gain access to internal components and to slide the drive cage out.
To remove the right side panel, complete the following steps:
  1. Loosen the two screws on the right side of the back panel (the screws stay loosely attached until re-tightened).
    Step 1: Loosen the two screws on the back panel
  2. Place the fingers of your right hand in the indentation on the right side panel and your thumb on the back panel.
  3. Pull backward on the right panel and rotate the front end of the panel to the right. The panel will disengage.

Removing the power supply

To remove the power supply from the PC, complete the following steps:
  1. Look inside the PC. The power supply is the rectangular metal box located flat up against the top back panel. Take time to notice how the cables are arranged inside the PC (orientation and label).
    A power cable (red, black, and yellow wires) is attached to each of the drives (floppy drive, located on the bottom front; hard drive, located above the floppy drive; and the CD-ROM/DVD drive, located on the top front). Note the labels on the connectors. The P6 power cable connects to the floppy drive, the P5 power cable connects to the hard drive, and the P7 power cable connects to the CD-ROM/DVD drive.
    There are a number of additional cables (for example, a flat ribbon-like cable) which attach to the drives. These cables do not need to be removed from the drives.
  2. Disconnect the power cables that connect to the drives (floppy, hard, and CD-ROM/DVD). Grasp the connector and pull firmly as you wiggle the connector back and forth.
  3. There is a screw, which holds the power supply in place on top of the PC. To gain access to this screw, remove the top cover of the PC. While looking at the back of the PC, reach up under the rear lip of the top cover and locate the tab (right side) holding the cover in place. Gently depress the tab while pulling the cover toward the rear of the PC. It should slide back about half an inch. Remove the cover from the top.
  4. The screw that holds the power supply in place is located on the top left side. Remove the screw and set it aside.
  5. Remove the fan and its case. Locate the case locking tab on top of the fan case. Gently pull the tab out while pulling the case toward you. The fan and its case can be set down inside the PC without removing any of the attached wires.
    Step 5: Pulling the tab out while pulling the case toward you
  6. Working from the back of the PC, remove the four screws that hold the power supply to the back panel. The power supply should stay in place.
    Step 6: Removing the screws that hold the power supply in place
  7. Disconnect the power supply cable and the power supply fan cable from the motherboard. The power supply cable is the cable that has multicolored wires with a long white plastic connector. Disconnect it by pressing down gently on the tab, which is on the left side of the connector, and pulling the connector away from the motherboard. The power supply fan cable is the cable that has three wires (black and green) with a small white connector. Disconnect it by gently pulling it away from the motherboard. Note the power supply fan connector location and label.
  8. Now completely remove the power supply and its attached cables from the PC.

Replacing the power supply

To replace the power supply, complete the following steps:
  1. Unpack the replacement power supply.
  2. Hold the replacement power supply close to the PC and connect the power supply cable (multicolored wires with a long white plastic connector) to the motherboard. The connector tab goes toward the left.
  3. Now connect the power supply fan cable (black and green wires) to the motherboard.
  4. With the two cables connected, slide the power supply against the back of the chassis aligning it with the four holes. It rests on a little flat piece of metal. The orientation of the new power supply inside the PC should be such that the cables for the power supply come out of the back of the supply.
  5. Replace the four screws you removed in Step #6 of Removing the power supply that hold the power supply in place.
  6. Replace the screw that you removed in Step #4 of Removing the power supply from the top of the PC.
  7. Replace the cover you removed in Step #3 of Removing the power supply.
  8. Reconnect the power cables that you removed in Step #2 of Removing the power supply for the CD-ROM/DVD drive (P7), the hard drive (P5), and the floppy drive (P6). Note that the floppy drive power cable attaches above the floppy drive ribbon cable with the red wire closest to you.
  9. Replace the fan and its case by aligning the four posts with the slots and sliding it toward the left side of the PC (viewing the PC from the rear) until it locks into place. The locking tab should snap back into its slot.

Replacing the right side panel

To replace the right side panel, complete the following steps:
  1. Align the tabs on the bottom of the right side panel with the edge of the frame.
  2. Press the right panel toward the chassis until the panel engages.
  3. Slide the panel forward until it locks in place.
  4. Tighten the two screws on the right side of the back panel.

Finishing touches

  1. Reconnect all devices, cables, and wires to the PC.
  2. Plug the computer into the power source.
  3. Place the old power supply box in the original shipping box for return to HP.