Yamaha - CVP-305 - 11-Note Rubber Contact Strip PSR-295 and this will require repair

and this will require repair in addition to the battery replacement

This power adapter is compatible with input voltages ranging from 120V to 240V

allowing the carbon contact to connect with the keyboard’s contact board

Rotary knob

This 12-note rubber contact strip is a replacement part designed for select Casio keyboards

Yamaha - CVP-305 - 11-Note Rubber Contact Strip PSR-295 and this will require repair11 Note Rubber Contact Strip for Yamaha Keyboards (High Note Section) This 11 note rubber contact strip is designed specifically for the highest notes on the keyboard. It features carbon contacts inside each dome that activate when a key is pressed, completing the circuit on the contact board. Compatible with Yamaha part numbers VCZ74500 and V8286700.