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Input Signal From The Button Circuit, Value

Measurement range: 0 - 1023 V

Normal range: ~4.1 V (when no buttons in the relevant circuit are affected.)

The value indicates the voltage in the button circuit.

Normal range: ~(3.6V, 3.1V, 2.4V, 1.4V)
Left button circuit 1 (>>|, AM/FM, |<<, CD)
Left button circuit 2 (*, 7, 4, 1)
Left button circuit 3 (0, 8; 5, 2)
Left button circuit 4 (#, 9, 6, 3)
Right button circuit 1 (>>, AM/FM, |<<, CD)
Normal range: ~(3.1V, 2.4V, 1.4V)
Right button circuit 2 (Up, Down, CD eject)
Normal range: ~(1.4V)
Right button circuit 5 (sound)
Button circuit for power button