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https://www.radioradar.net/en/service_manuals/videotechnics_circuits/sony_slv_e850b_x.html

Sony SLV-E850B, E850UX, E880EG, F900B, F900NP, F900UX, F900VC, F990B, F990NP, F990UX, F990VC

Schematic diagram, oscillograms at the control points of the videorecorder Sony SLV-E850B, E850UX, E880EG, F900B, F900NP, F900UX, F900VC, F990B, F990NP, F990UX, F990VC