Casio LK-90TV Service Manual page 17

10. Remove three screws and one connector, and then remove the M649-MAA3 PCB.
11. Remove three screws and two connectors, and then remove the M649-CNA6 PCB.
M649-CNA6 PCB
M649-MAA3 PCB
12. Remove two screws and the M649-CNA5 PCB.
13. Remove three screws and the M649-CNA2 PCB.
M649-CNA2 PCB
14. Remove 2 screws.
15. Remove the volume knob and the M649-CNA3 PCB.
16. Remove 20 screws and the M649-CNA1 PCB.
17. Remove two screws and the M649-CNA4 PCB.
M649-CNA5 PCB
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Connectors
M649-CNA5 PCB