Full in-house development and extra-rare CD player which isn't that rare after all : Sharp was a major OEM provider for optical pickups and laser assemblies for many japanese manufacturers.
There is some Sharp in your Aurex, in your Diatone, in your Denon and in your Kyocera !
Originally presented in silver dress, the DX-3 was finally offered with two of the later 1980s' design staples : blue and printed grids :)
The large display works a bit like the that of the Pioneer PD-70 or Technics SL-P10 : able to display present tracks, selected tracks, programming and more - but calling for very sharp eyes !
Very well built inside but terribly complex, terribly complex.
The output op'amps are two LM 833N while the d/a itself is done by a Sony CX-20012 IC.
The DX-3, however, didn't sell much and wasn't rebadged by anyone either : Sharp made much more money selling pickups and dedicated ICs so it really didn't need to sell complete players !
Detailed technical description, nudies and schematics at the indispensable vintage-audio-laser.com.