Replacing Small Expansion Box (External Hdu) - AT&T PC 6300 Service Manual

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Replacing Small Expansion Box (External HDU)
1. Turn the System Module and all external devices OFF.
2. Unplug the ac power cable from the rear panel.
3. Loosen the two screws that secure the upper cover.
4. Slide the upper cover forward approximately 0.5 inch and
lift it from the System Module.
5. Disconnect the ribbon cables from the HDU Controller
Note: Notice how the ribbon cables are connected
to the controller with the blue strip of the cable at
the bottom.
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