Oki 4M - Manual (Page 61)

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3.3.17 Base Plate
(1) Dismount the upper cover assy. (See Section 3.3.4.)
(2) Dismount the base frame. (See Section 3.3.12.)
(3) Remove two screws 1 , disconnect connector 2 , and dismount power supply unit 3 .
(4) Dismount insulation sheet 4 .
(5) Remove two screws 5 and dismount main control board 6 from base plate 7 .
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