1. 5504WD Digital Piano Main Control Board, Compatible with 8802 / 8805 / 8809 88-Key Weighted Keyboard Assembly, Multiple Velocity Curve Options

Item	Specification
Model	5504WD
Compatible Keyboard Models	8802, 8805, 8809
Velocity Curves	4 Optional: Curve E / F / G / H
Application	Digital piano main control replacement, DIY electric piano assembly
Function	Detect key velocity, trigger tone output, match graded weighted keyboard
Board Type	PCB main controller board
Matching Product	88-key graded weighted hammer action keyboard assembly

Compatible with multiple 88-key weighted keyboard assemblies: 8802, 8805 and 8809, one mainboard fits different keyboard modules for flexible repair and DIY projects.
4 adjustable velocity curves (E / F / G / H), you can switch touch sensitivity to meet different playing habits, from soft to heavy touch response.
Professional digital piano main control PCB board, precisely capture key strike velocity, deliver stable and accurate MIDI / tone signal output.
Ideal replacement spare part for broken original control board of digital piano, widely used for instrument factory assembly, maintenance shop and piano DIY enthusiasts.
Rigorous factory testing before shipment, stable signal transmission, low failure rate, easy wiring and installation to pair with 88 weighted hammer keyboard.