Gdzie znaleźć schematy serwisowe do Sony Mini Hi-Fi MHC-EC55?

Hi all,

I badly need circuit schematic diagrams or better the complete service
manual of Sony Mini Hi-Fi system MHC-EC55 (I guess that MHC-EC77 is
also equivalent to it).

Anybody can kindly help me please?

Thanks a lot in advance and best regards,
Ahmad

MHC-EC55 MHC-EC77 MHC-GX99 = HCD-EC55 HCD-EC77 HCD-GX99 + speakers SS-EC55 SS-EC55S SS-EC77 SA-WG99 uploaded :
https://www.elektroda.pl/rtvforum/topic977562.html