IIRC, the WD-1002-HD0 is the same controller as the
WD-1002-05, except that
 it doesn't have the floppy support.  I think Herb Johnson sells a manual
 for one on his 
retrotechnology.com site, but I also haven't checked
 bitsavers. 
Yes, but does that manual contain a schematic? Alas I've discovered that
many computer manuals don't contain such useful information.
-tony