Alesis iO4 Service Manual page 7

2.DISASSEMBLE THE MAIN PCB ASSEMBLY . (Fig.2)
(A)REMOVE 8 SCREWS
(B)REMOVE 8 NUTS AND 8 WASHER FROM THE TOP PANEL
(C)REMOVE 7 KNOB FROM THE TOP PANEL
(D)REMOVE 7 NUTS AND 7 WASHERS FROM THE TOP PANEL
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(Fig.2)