hifi engine

AIWA AD-F660, AD-F770, AD-F990 service manuals

I have all these Decks. Very good Decks.
One time i have repaired the AD-F660 (It was a little transistor that drive the heads motor).
Now i have a problem with the AD-F770 and i need for the schematics.
I want the service manuals because i might need it in future.