Hazeltine 1500 screen garbage; ideas?

Thanks to the generosity of Kenneth Marshall and his colleagues at the Laboratory for Laser Energetics, I now have a MicroPDP-11, RX-01, a whole box of miscellaneous flip chips, tons of documentation, and a Hazeltine 1500 terminal. Preliminary to setting up all the rest, I thought I'd try getting the Hazeltine working. I plugged it in and powered up, but the screen seems to be displaying random characters constantly while flickering... it's like somebody is sending a binary file over the serial line, except the serial line isn't connected to anything. Can someone with more terminal knowledge than me try to shed some light? I'm going to check very carefully to make sure no keys are sticking now... I don't think that's the problem but it sure would be nice if it was :) John -- "I've tried programming Ruby on Rails, following TechCrunch in my RSS reader, and drinking absinthe. It doesn't work. I'm going back to C, Hunter S. Thompson, and cheap whiskey." -- Ted Dziuba