Stay safe and keep those machines running
For discontinued components (e.g., the original TDA7293 modules used in very early U15a units), enthusiast forums on GroupDIY or SoundForums.net often contain extracted schematics. However, no non-official copy is reliable for DSP IC programming.
Beta 3 U15a Service Manual Link -
Stay safe and keep those machines running
For discontinued components (e.g., the original TDA7293 modules used in very early U15a units), enthusiast forums on GroupDIY or SoundForums.net often contain extracted schematics. However, no non-official copy is reliable for DSP IC programming. Beta 3 U15a Service Manual