For what it's worth:

HP A-I-O PSC machines lose the WIRELESS scanning feature if running a computer/laptop through Time Capsule. One can still print remotely, however.

In order to user the scanner functions, the computer/laptop must be connected directly to the HP A-I-O PSC machine with a cable.

Note: Not sure if this only applies to HP or to only some of their models. But all the latest driver updates have NOT made my PSC's scanner work wirelessly through Time Capsule . . . although the printer will.