Brother EM-850fx User Manual page 25

[4] Remove screws and upper joint plates from the lower joint plates on
[5] Remove the lower joint plates from the keyboard on right and left sides.
Keep screws and plates in safe place for later use. For installation, reverse
theses steps.
REMEMBER...When you use the keyboard detached, be sure to remove all the
upper and lower joint plates. Or the malfunction may occur.________________
Lower Joint Plate