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HP Compaq dc7800 Small Form Factor PC - Removing and Replacing the Power supply

This document pertains only to HP Compaq dc7800 Small Form Factor PCs with the following case design:

Before you begin

  • Turn off the computer, and then disconnect all cables. Disconnect the Ethernet or modem cable before disconnecting the power cord.

  • Move the computer to a clear, flat, stable work surface over a non-carpeted floor.

  • HP strongly recommends the use of an anti-static wrist strap and a conductive foam pad when working on the computer.

  • Do not remove a component from its protective packaging until you are ready to install it.

WARNING: The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
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.

Video overview (in English)

To view a video demonstrating the procedure for removing the power supply, right-click Power supply removal video and select Open link in new window/tab.

Replacement part information

The following HP part numbers are known to be compatible with this system:

NOTE: Part numbers are subject to change.
Description
Part Number
Requires Return
Power supply ? Input voltage 100 to 240 V AC (auto-ranging), 47 to 63 Hz - 6 DC outputs, 240 W - With power factor correction
437797-001 (Modified)
Yes
Power supply ? Input voltage 100 to 240 V AC (auto-ranging), 47 to 63 Hz - 6 DC outputs, 240 W, 80% efficient - With power factor correction
437798-001 (Modified)
Yes

* If a part is listed as "Yes" under "Requires Return" then the defective part needs to be returned to HP. For more information about returning parts to HP select one of the links below:

Defective parts return procedure for US .

Defective parts return procedure for Europe .

NOTE: For customers in countries/regions with RoHS legislation* (e.g. EU, China, etc.) restricting the use of hazardous substances in electrical equipment. The use of the Original Spare part is regulated by RoHS legislation. If your unit contains a part that is labelled with the Modified Spare number, the Modified Spare must be ordered as the replacement part. If your unit contains a part that is labelled with the Original Spare number, please order the Original Spare as the replacement part. In this case either the Original Spare or the Modified Spare may be shipped which will not affect performance or functionality of the unit.

Power supply removal

CAUTION: Review the following safety considerations before performing the following steps. Failure to comply with these safety considerations could result in damage to the product.
Step 1
With all cables disconnected from the computer, remove the access panel.
Step 2
Rotate the drive cage to the up position.
Step 3
Rotate the power supply to the up position.
Step 4
Remove the power cables from the cable clip under the drive cage.
Step 5
Disconnect the power cables from all of the drives and the system board, noting their location for reinstallation.
Step 6
Rotate the power supply slightly inward and then pull forward to move the smaller guide pins out of the curved channels in the mounting bracket into the vertical channels.
Step 7
Lift the power supply up and out of the mounting bracket.

Power supply replacement

Step 1
Position the power supply with the guide pins over the channels in the mounting bracket.
Step 2
Slide the power supply down and then back toward the rear of the chassis until the smaller guide pins enter the curved channel.
Step 3
Connect all power cables to the drives and system board.
Step 4
Place the power cables into the cable clip under the drive cage.
Step 5
Rotate the power supply to the down position.
Step 6
Rotate the drive cage to the down position.
Step 7
Replace the access panel.

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