Can You Sink a Boat for Lack of a One Dollar Bolt??

I suppose theoretically it's possible. But can you really repair a 30-year-old radar unit for $30.00? I am here to tell you that you absolutely can, if the problem is the same as ours. Not long ago, I fired up our Raytheon SL70 radar unit and it all started fine. Once it was going, however, the beam was doing the sweeps, but there were no targets on the display. An internal self diagnostic showed everything was working okay, but obviously it wasn't. This unit is long past its manufacturing date and it's highly doubtful if Raymarine will even fix these any more or if it's worth it. So trying a few things couldn't hurt.