Yamaha PF1000 Service Manual. Electronic piano. Page 23 PF1000 Assembling the Keyboard 201 Hammer, White Key (Hammer, Black Key) Place the keyboard assembly upsidedown, insert a hammer assembly into the frame, and put the stopper (L88W) on. (Fig. Page 56 PF1000 YAMAHA [ Clavinova Date: 1, Jun 2002 Model PF1000 MIDI