YAMAHA KV8-M4570-01X KV8-M4570-00X YV100X/YV100XG Head I/O Board 5322-216-04676 The YAMAHA KV8-M4570-01X Head I/O Board is an electronic PCB assembly used in the head control section of compatible YAMAHA YV100X and YV100XG SMT placement machines . The board is also associated with KV8-M4570-00X as a related revision and 5322 216 04676 as a commonly referenced cross number. Its primary role is to provide an electrical interface for head-related input and output signals between