Yamaha YPP-50 Owner's Manual page 6

Attach the stand assembly to the main unit (A).
Turn the assembled stand upside down and place it on top of
the main unit (which should also be upside-down) with the feet
extending toward the keyboard side of the main unit. The tops
of the side panels fit into the recessed areas at the ends of the
main unit. Align the holes in the front and rear panel brackets
with the holes in the bottom of the main unit, and firmly screw
in the six short bolts through the brackets. Finally, turn the
entire assembly rightside-up and stand it on its feet.
* Check to make sure that all screws have been securely tightened.
Plug in the damper pedal (E)
Plug the supplied FC5 damper pedal cable into the DAMPER
jack on the rear panel of the main unit, and place the pedal
in a convenient position on the floor below the keyboard.
Install the music stand (F)
Insert the bottom (flat) edge of the music stand (F) into the
slot on the top of the main unit (A) so that the music stand
leans backwards away from the keyboard.
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