Thanks to you guys for the responses. Yes, the libsane-hpaio package is installed on both computers and the firewall is off on both.
Additional datapoint, the scanner is working from one of them (the old Asus 1000HD, it finds both wireless printers [ HP5520 and HP7520 (wife's machine)]on the network), but neither wireless printer scanner is found by xsane 0.998 on the HP I7laptop that is my main computer.
The problem appears to be limited to the I7 machine.
The printer reports the IP address as 192.168.1.6.