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 RL70 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.