Korg BP-01 chromatic tuner

[suhogruz]

Please,hepl me with schematic

[Jazz P Bass]

No way, no how are you going to find a schematic.
Other than the power supply, it will be a microcontroller based unit.
Surface mount to boot.
The unit has a 3 year warranty.
Did you try contacting Korg?
Pedal Tuner | Chromatic | Strobe | Korg Pitchblack