iMacs can't print to HP Laser jet; browser can acces printer config page

HP CP2025dn color laserjet printer; iMac/OSX 10.9.4; new ASUS RT-AC68U router.

Printing was fine before new router.  Error msg. "the printer is not responding."  

Reset printer to factory defaults.  Router at 192.168.1.1.  Internet access works fine.  DHCP-assigned IP 192.168.1.81 for printer listed in printer front window.  Can see printer config page in browser at that address.  Config page says status "Ready."

iMac "Printers & Scanners"  shows yellow dot, "In use."  Driver version 19.9.  Location 192.168.1.81.

Re-booted router, printer, and computer.  No change.

 Any help appreciated!

Thanks