Hi
I have found these pages that seems to explain how to
repair FDD with belts in bad condition (only japanese though):
FS-A1F/FM and FS-A1FX/WX/WSX/ST/GT:
http://www.giga.it.okayama-u.ac.jp/~saito/msx/ope.html (nice graphics)
FS-A1WX:
http://www.geocities.co.jp/SiliconValley-SanJose/8768/msx_01.html
FS-A1WSX (and also how to expand memory to 256Kb):
http://www5.freeweb.ne.jp/computer/bentham/msx/wsx.htm
Something about the HB-F1XDJ FDD:
http://www.amy.hi-ho.ne.jp/nakajima-jr/com/xdj.htm
At the above page you can also see that there´s a schematic about
a RGB-SCART japanese connector.
Greets
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