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.