Datasheets, service manuals, circuits, electronics, components, CAD
https://www.radioradar.net/en/service_manuals/audiotechnics_circuits/pioneer_ken-14_13_11.html
Pioneer KEH-1400/UC, KEH-1450/ES, KEH-1311/UC, KEH-1100/UC, KEH-1150/ES, KEH-1300/EW, KEH-1300SDK/GR, KEH-1400/IT
Block diagram, schematic diagrams of autoradio tape recorders Pioneer