[Yaesu] YR-901 circuit schematic

[LARRY]

Hi All:

I've got the Yaesu YR-901 RTTY/CW reader.  The manual for it has a 
parts list, but no circuit schematic drawing.  Perhaps it was a loose leaf
insert?  Does anybody out there in Yaesu-land have it or know of a source
for it?  I've tried Googling, lookinat at mods.dk, FoxTango, etc -- but no 
joy.  

Downloading the online manual for it I found the circuit schematic drawing
for the optional AFSK unit in the PDF manual, but none of the rest of the
guts including the FSK unit, mainboard, etc.  Apparently the PDF manual 
is somewhat later than the hardcopy manual that came with my unit.  

Thanks!  

--Larry, W7JYJ