I bought a used 426 off of ebay. The radio works great . The display is a washed out . It is not a bright black and white more of a dim light black on a dim white background. I have the dimmer control set on high and the contrast set on 13. The ads for this radio show a clear black and white display. Is this normal or does it need to go Uniden for repair. Are their any setting that I am missing?