Casio EX-Z850 Service Manual & Parts List page 29

Removing the key FPC
20. Remove one connector, and then remove the FPC.
Note: The key FPC is fixed by double-sided tape
Removing the Battery case.
21. Remove five screws, and then remove the Battery case.
Screw (S2)
Screw (S4)
Assembly Precautions:
Set the battery case after aligning it with the positioning pins.
Positioning pins
Connector
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Key FPC
Screws (S3)