YAMAHA KHY-M715H-01 YS12 YG12 Head Maintenance Kit The YAMAHA KHY-M715H-01 Head Maintenance Kit is a maintenance parts set developed for servicing the placement head system of YS12 and YG12 SMT machines . The placement head operates continuously during component pickup, positioning, and placement, making its pneumatic and mechanical service components subject to gradual wear. During long production cycles, sealing parts, filters, springs, and other maintenance items may