Can't add airprint printer
I'm trying to add a Ricoh printer, which has AirPrint ability. iMac 2013 model, latest El Capitan, going to the printer, I can see the Ricoh printer, selected it, it did not detect AirPrint under use. This is happening on one iMac, it works on three other imacs, mac mini, macbook pro, and air.
I tried print system reset, but I can't seem to add this particular printer on this specific iMac.
I was able to add two other different printers using AirPrint without problem on this specific iMac.
What else is there to try?