Datasheets, service manuals, circuits, electronics, components, CAD
https://www.radioradar.net/en/service_manuals/videotechnics_circuits/sony_slv-ga30_x.html
Sony SLV-GA30, GA50, GA66, GA70K, GA77K, GF80, GF90K, GF99K, P66, PH99
Schematic diagram of the videorecorder Sony SLV-GA30, GA50, GA66, GA70K, GA77K, GF80, GF90K, GF99K, P66, PH99