Casio SF-5990SY - Secret Function; To register a password; To access protected modes; To change the password

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8 Remove screws on PCB shown above then remove PCB ass’y.
Main PCB
(9 screws)
Keyboard PCB
(11 screws)
9 Separate upper cabinets.
REMARK:
Heat seal and wires must be placed inside of the hinge in order for the Lower cabinet (keyboard) to fit
into place.
If heat seal and wires are placed improperly, they are damaged.
Lower cabinet
Heat seal
Wires (Black/Red)
Hinge