Casio EX-Z4 Service Manual & Parts List page 23

9. Disconnect the CONNECTOR, and then separate the LCD UNIT from the KEY UNIT.
10. Remove the POWER UNIT.
11. Remove the two screws and disconnect the two CONNECTORs, and then remove the MAIN PCB and the speaker.
screws
NOTE: Discriminating between the two MAIN PCBs
A TYPE: IC215 mounted
NOTE: When assembling, align the POWER UNIT with
connectors
B TYPE: IC215 not mounted
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the position as shown below.