This isn't possible, although both are "3S" drives. The 1673S and 1693S belong to a different generation and are incompatible with earlier 3S models. See
this summary on the codeguys' page.
As to fixing the drive- this has been discussed various times at CDFreaks. He may have to go to MTKFlash (runs under
DOS). See, for example,
this thread and some of the references in it.
G