tono cw/rtty decoder
 

I have a Tono 9000E along its crt1200 monitor produced in 80's by Tono Corporation Japan and distributed for USA market under the brand name Drake. My monitor is defective and I need the schematic.

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