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HP Compaq dc7900 Small Form Factor PC - Removing and Replacing the Front Audio and USB Assembly

This document pertains only to HP Compaq dc7900 Small Form Factor PCs with the following case design:
Before you begin
  • You need a Torx #15 (T15) screwdriver.
  • 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 front audio and USB assembly, right-click Front audio and USB assembly 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
Front I/O with USB and audio cables
460895-001
No
* 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:
  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.
Front Audio and USB Assembly 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
Remove the front bezel.
Step 3
Remove the fan duct.
Step 4
Remove the hood sensor.
Step 5
Remove the chassis fan.
Step 6
Rotate the drive cage to the up position.
Step 7
Disconnect the front audio and USB cables from the system board.
Step 8
Remove the Torx-15 screw that secures the front audio and USB assembly to the front of the chassis.
Step 9
Slide the assembly up to disengage the bottom retaining tabs.
Step 10
Pull the assembly out of the opening on the front of the chassis.
Step 11
Thread the front audio and USB cables through the opening in the drive cage clutch and remove the assembly.
Front Audio and USB Assembly replacement
Step 1
Thread the front audio and USB cables into the opening on the front of the chassis and through the opening in the drive cage clutch.
Step 2
Position the assembly into the opening on the chassis.
Step 3
Slide the assembly down to engage the bottom retaining tabs.
Step 4
Replace the Torx-15 screw that secures the front audio and USB assembly to the front of the chassis.
Step 5
Connect the front audio and USB cables to the system board.
Step 6
Lower the drive cage to the down position.
Step 7
Replace the chassis fan.
Step 8
Replace the hood sensor.
Step 9
Replace the fan duct.
Step 10
Replace the front bezel.
Step 11
Replace the access panel.

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