Thanks, guys, for your advice. The 1160 isn't even listed on the Epson site as a candidate for a waste pad reset. I see that there are button-push alternatives, but I think I've got my money's worth out of the 1160. I've disconnected it from the CIS and it's been sitting for a day or so now, so the head is probably dried out. I'm installing its successor, an Epson C120, also equipped with a CIS and look forward to another decade of use from this printer. If my 4800 lasts as long, I'll be stoked.
Before installing the brand-new C120's CIS, I had to install the original Epson carts to ensure a good nozzle check. It's been a long time since I've seen one of these and I was amazed at the tiny size of the cart and the quantity of ink contained therein. Probably less than a tablespoon. At $20 a pop, it won't be long before I've recouped the CIS investment.