Always ensure the device is safely discharged before touching the internal board.
The Bose 2683 service manual covers a wide range of topics, including:
Visual breakdowns of how mechanical parts fit together. Where to Find the Bose 2683 Service Manual
Critical data for testing points on the circuit board with a multimeter.
Known to contain multiple drivers (likely 5.25" or 6") and a built-in power amplifier.