Q: My iPad can't find AirPrint with new hp 7500A

The Airprint only works with specific Airprint printers. Those models should be on Apples Store.

Make sure you have the latest firmware on the printer, the iPad and the printer and iPad are connected to the same network.

http://support.apple.com/kb/HT4356?viewlocale=en_US&locale=en_US

AirPrint Setup and Troubleshooting

http://www.apple.com/support/ipad/assistant/airprint/http://www.apple.com/support/ipad/assistant/airprint/

How to print from your new iPad using AirPrint

http://www.imore.com/print-ipad-airprinthttp://www.imore.com/print-ipad-airprint

AirPrint Basics

http://support.apple.com/kb/ht4356http://support.apple.com/kb/ht4356

 Cheers, Tom