Tono 9000 cw/rtty decoder
 

I have a Tono 9000 along its CRT1200 Monitor produced in the 80's by Tono Corporation Japan. My monitor is defective and I need the schematic.

Till a few years ago Tono Corporation had a website (vhf business) but the
Company seems to be out of business now.
Could anyone give me some information or at least tell me a Japanese
forum where I could get help.
Thanks