Last night, it was time to start printing for the alternate process print exchange. Poured the chemicals, humidified the paper I coated Sunday night, heated the developer, even had the vacuum frame pulling 25" of Hg. I turned on the UV light box, the fan went on, the bulbs didn't light up. The UV unit was purchased from the Palladio Company about 1991. (Boy, things just don't last the way they used to.) The things I said made the picture of my wife's grandfather blush (and he was a sailor!). Any suggestions on how to determine which (or all) of the ballasts need to be replaced? I have included a photograph of the wiring and a close up of a ballast.